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Lyu C, Gao Y, Zhou K, Hua M, Shi Z, Liu PN, Huang L, Lin N. On-Surface Self-Assembly Kinetic Study of Cu-Hexaazatriphenylene 2D Conjugated Metal-Organic Frameworks on Coinage Metals and MoS 2 Substrates. ACS NANO 2024. [PMID: 39031124 DOI: 10.1021/acsnano.4c05838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/22/2024]
Abstract
Supramolecular coordination self-assembly on solid surfaces provides an effective route to form two-dimensional (2D) metal-organic frameworks (MOFs). In such processes, surface-adsorbate interaction plays a key role in determining the MOFs' structural and chemical properties. Here, we conduct a systematic study of Cu-HAT (HAT = 1,4,5,8,9,12-hexaazatriphenylene) 2D conjugated MOFs (c-MOFs) self-assembled on Cu(111), Au(111), Ag(111), and MoS2 substrates. Using scanning tunneling microscopy and density functional theory calculations, we found that the as-formed Cu3HAT2 c-MOFs on the four substrates exhibit distinctive structural features including lattice constant and molecular conformation. The structural variations can be attributed to the differentiated substrate effects on the 2D c-MOFs, including adsorption energy, lattice commensurability, and surface reactivity. Specifically, the framework grown on MoS2 is nearly identical to its free-standing counterpart. This suggests that the 2D van der Waals (vdW) materials are good candidate substrates for building intrinsic 2D MOFs, which hold promise for next-generation electronic devices.
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Affiliation(s)
- Chengkun Lyu
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore
- Department of Physics, The Hong Kong University of Science and Technology, Hong Kong SAR 999077, China
| | - Yifan Gao
- Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Kun Zhou
- Center for Soft Condensed Matter Physics & Interdisciplinary Research, School of Physical Science and Technology, Soochow University, Suzhou 215006, China
| | - Muqing Hua
- Department of Physics, Suqian University, Suqian, Jiangsu 223800, China
| | - Ziliang Shi
- Center for Soft Condensed Matter Physics & Interdisciplinary Research, School of Physical Science and Technology, Soochow University, Suzhou 215006, China
| | - Pei-Nian Liu
- Shanghai Key Laboratory of Functional Materials Chemistry and Institute of Fine Chemicals, East China University of Science and Technology, Shanghai 200237, China
| | - Li Huang
- Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
- Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong), Shenzhen 518045, China
| | - Nian Lin
- Department of Physics, The Hong Kong University of Science and Technology, Hong Kong SAR 999077, China
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2
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Hao X, Zhang T, Niu M, Han X, Yang H, Zhang Q, Hou Y, Grazioli C, Liu L, Qiao J, Wang Y. Selective Formation of Homochiral Dimers by Intermolecular Charge Transfer on a hBN Nanomesh. ACS NANO 2024; 18:11933-11940. [PMID: 38663413 DOI: 10.1021/acsnano.4c01844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
In this study, a comprehensive characterization was conducted on a chiral starburst molecule (C57H48N4, SBM) using scanning tunneling microscopy. When adsorbed onto the hBN/Rh(111) nanomesh, these molecules demonstrate homochiral recognition, leading to a selective formation of homochiral dimers. Further tip manipulation experiments reveal that the chiral dimers are stable and primarily controlled by strong intermolecular interactions. Density functional theory (DFT) calculations supported that the chiral recognition of SBM molecules is governed by the intermolecular charge transfer mechanism, different from the common steric hindrance effect. This study emphasizes the importance of intermolecular charge transfer interactions, offering valuable insights into the chiral recognition of a simple bimolecular system. These findings hold significance for the future advancement in chirality-based electronic sensors and pharmaceuticals, where the chirality of molecules can impact their properties.
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Affiliation(s)
- Xiaoyu Hao
- School of Integrated Circuits and Electronics & Yangtze Delta Region Academy, Beijing Institute of Technology (BIT), Beijing 100081, China
| | - Teng Zhang
- School of Integrated Circuits and Electronics & Yangtze Delta Region Academy, Beijing Institute of Technology (BIT), Beijing 100081, China
| | - Mengmeng Niu
- School of Integrated Circuits and Electronics & Yangtze Delta Region Academy, Beijing Institute of Technology (BIT), Beijing 100081, China
| | - Xu Han
- School of Integrated Circuits and Electronics & Yangtze Delta Region Academy, Beijing Institute of Technology (BIT), Beijing 100081, China
| | - Huixia Yang
- School of Integrated Circuits and Electronics & Yangtze Delta Region Academy, Beijing Institute of Technology (BIT), Beijing 100081, China
| | - Quanzhen Zhang
- School of Integrated Circuits and Electronics & Yangtze Delta Region Academy, Beijing Institute of Technology (BIT), Beijing 100081, China
| | - Yanhui Hou
- School of Integrated Circuits and Electronics & Yangtze Delta Region Academy, Beijing Institute of Technology (BIT), Beijing 100081, China
| | - Cesare Grazioli
- IOM-CNR, Laboratorio TASC, Sincrotrone Trieste, Trieste 34149, Italy
| | - Liwei Liu
- School of Integrated Circuits and Electronics & Yangtze Delta Region Academy, Beijing Institute of Technology (BIT), Beijing 100081, China
| | - Jingsi Qiao
- School of Integrated Circuits and Electronics & Yangtze Delta Region Academy, Beijing Institute of Technology (BIT), Beijing 100081, China
| | - Yeliang Wang
- School of Integrated Circuits and Electronics & Yangtze Delta Region Academy, Beijing Institute of Technology (BIT), Beijing 100081, China
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3
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Wang X, Lin T, Lin N. A Cu 2(C 6O 6) metal-organic framework monolayer assembled on silicon carbide grown graphene exhibiting a metallic band structure. NANOSCALE 2024; 16:1120-1124. [PMID: 38131418 DOI: 10.1039/d3nr04331b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
We report the self-assembly of a monolayer metal-organic framework of Cu-benzenehexol (BHO) on a graphene/SiC substrate assisted by in situ Cu-catalyzed deprotonation reactions. The density functional theory calculations reveal that the free-standing framework is a semiconductor with a band gap of 0.485 eV. Interestingly, upon adsorption on the substrate, the Fermi level is up-shifted to the conduction band of the free-standing framework due to the n-doped graphene on SiC, while the other band structure features are largely preserved. The metallic nature corroborates the scanning tunneling microscopy images acquired near the Fermi level. This work demonstrates that the graphene substrate, which interacts weakly with the framework, can be used to tune the Fermi level of the metal-organic framework.
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Affiliation(s)
- Xiaobo Wang
- Physics Laboratory, Industrial Training Center, Shenzhen Polytechnic University, Shenzhen 518055, China
| | - Tao Lin
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China.
| | - Nian Lin
- Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, China.
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4
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Karner C, Bianchi E. Anisotropic functionalized platelets: percolation, porosity and network properties. NANOSCALE ADVANCES 2024; 6:443-457. [PMID: 38235098 PMCID: PMC10790971 DOI: 10.1039/d3na00621b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 11/27/2023] [Indexed: 01/19/2024]
Abstract
Anisotropic functionalized platelets are able to model the assembly behaviour of molecular systems in two dimensions thanks to the unique combination of steric and bonding constraints. The assembly scenarios can vary from open to close-packed crystals, finite clusters and chains, according to the features of the imposed constraints. In this work, we focus on the assembly of equilibrium networks. These networks can be seen as disordered, porous monolayers and can be of interest for instance in nano-filtration and optical applications. We investigate the formation and properties of two dimensional networks from shape anisotropic colloids functionalized with four patches. We characterize the connectivity properties, the typical local bonding motives, as well as the geometric features of the emerging networks for a large variety of different systems. Our results show that networks of shape anisotropic colloids assemble into highly versatile network topologies, that may be utilized for applications at the nanoscale.
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Affiliation(s)
- Carina Karner
- Institut für Theoretische Physik, TU Wien Wiedner Hauptstraße 8-10 A-1040 Wien Austria
| | - Emanuela Bianchi
- Institut für Theoretische Physik, TU Wien Wiedner Hauptstraße 8-10 A-1040 Wien Austria
- CNR-ISC, Uos Sapienza Piazzale A. Moro 2 00185 Roma Italy
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5
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Jiménez-Martín A, Gallardo A, de la Torre B. Coverage-modulated halogen bond geometry transformation in supramolecular assemblies. NANOSCALE 2023; 15:16354-16361. [PMID: 37786923 DOI: 10.1039/d3nr03899h] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
Halogen bonding (HB) has emerged as a promising route for designing supramolecular assemblies due to its directional nature and versatility in modifying interactions through the choice of halogens and molecular entities. Despite this, methods for tuning these interactions on surfaces, particularly in terms of directionality, are limited. In this study, we present a strategy for tuning the directionality of self-assembly processes in homomolecular organic compounds on inert metal surfaces. A variety of halogen-halogen geometries can promote highly-extended one-dimensional or two-dimensional self-assembly depending on the molecular coverage. Our results indicate that under lower molecular coverage conditions, robust one-dimensional (1D) structures promote the self-assembly of halogen-bonded molecules on Au(111). At certain coverage, a transformation from type-I to synthon halogen bonding is observed, leading to an extended hexagonal pattern of molecular assembly. The atomistic details of the structures are experimentally studied using high-resolution atomic force microscopy and supported by first-principle calculations. We employed DFT to evaluate the interplay between electrostatics and dispersion forces driving both type-I and synthon assemblies. The results reveal a halogen-bond geometry transformation induced by a subtle balance of molecule-molecule interaction. Finally, we investigate the capability of the halogen-bonded supramolecular assembly to periodically confine electronic quantum states and single atoms. Our findings demonstrate the versatility of sigma-bonding in regulating molecular assembly and provide new insights for tailoring functional molecular structures on an inert metal substrate.
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Affiliation(s)
- Alejandro Jiménez-Martín
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, 78371 Olomouc, Czech Republic.
- Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, 11519 Prague, Czech Republic
- Institute of Physics, Czech Academy of Sciences, 16200 Prague, Czech Republic
| | - Aurelio Gallardo
- Institute of Physics, Czech Academy of Sciences, 16200 Prague, Czech Republic
- IMDEA Nanoscience, 28049 Madrid, Spain.
| | - Bruno de la Torre
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, 78371 Olomouc, Czech Republic.
- Institute of Physics, Czech Academy of Sciences, 16200 Prague, Czech Republic
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6
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Guo H, Jiménez-Sánchez MD, Martínez-Galera AJ, Gómez-Rodríguez JM. Growth of 1D ClAlPc molecular chains mediated by graphene moiré patterns. NANOSCALE 2023; 15:5083-5091. [PMID: 36808204 DOI: 10.1039/d2nr06237b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The on-surface formation of iso-oriented 1D molecular architectures, with high structural perfection, on 2D materials has been a long-sought objective. However, such realization has been troublesome and limited, and it still remains an experimental challenge. Here, the quasi-1D stripe-like moiré pattern, arising at the interface of graphene grown on Rh(110), has been used to guide the formation of 1D molecular wires of π-conjugated, non-planar, chloro-aluminum phthalocyanine (ClAlPc) molecules, brought together by van der Waals interactions. Using scanning tunnelling microscopy (STM) under ultra-high vacuum (UHV) at 40 K, the preferential adsorption orientations of the molecules at low coverages have been investigated. The results shed light on the potential signature of graphene lattice symmetry breaking, induced by the incommensurate quasi-1D moiré pattern of Gr/Rh(110), as the subtle mechanism behind this templated growth of 1D molecular structures. For coverages close to 1 ML, the molecule-molecule interactions favor a closely packed square lattice arrangement. The present work provides new insights to tailor 1D molecular structures on graphene grown on a non-hexagonal metal substrate.
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Affiliation(s)
- Haojie Guo
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain.
| | - Mariano D Jiménez-Sánchez
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain.
| | - Antonio J Martínez-Galera
- Departamento de Física de Materiales, Universidad Autónoma de Madrid, E-28049 Madrid, Spain.
- Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - José M Gómez-Rodríguez
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain.
- Departamento de Física de Materiales, Universidad Autónoma de Madrid, E-28049 Madrid, Spain.
- Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain
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7
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Bhatt HN, Pena-Zacarias J, Beaven E, Zahid MI, Ahmad SS, Diwan R, Nurunnabi M. Potential and Progress of 2D Materials in Photomedicine for Cancer Treatment. ACS APPLIED BIO MATERIALS 2023; 6:365-383. [PMID: 36753355 PMCID: PMC9975046 DOI: 10.1021/acsabm.2c00981] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Over the last decades, photomedicine has made a significant impact and progress in treating superficial cancer. With tremendous efforts many of the technologies have entered clinical trials. Photothermal agents (PTAs) have been considered as emerging candidates for accelerating the outcome from photomedicine based cancer treatment. Besides various inorganic and organic candidates, 2D materials such as graphene, boron nitride, and molybdenum disulfide have shown significant potential for photothermal therapy (PTT). The properties such as high surface area to volume, biocompatibility, stability in physiological media, ease of synthesis and functionalization, and high photothermal conversion efficiency have made 2D nanomaterials wonderful candidates for PTT to treat cancer. The targeting or localized activation could be achieved when PTT is combined with chemotherapies, immunotherapies, or photodynamic therapy (PDT) to provide better outcomes with fewer side effects. Though significant development has been made in the field of phototherapeutic drugs, several challenges have restricted the use of PTT in clinical use and hence they have not yet been tested in large clinical trials. In this review, we attempted to discuss the progress, properties, applications, and challenges of 2D materials in the field of PTT and their application in photomedicine.
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Affiliation(s)
- Himanshu N. Bhatt
- Department of Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, Texas 79902, United States; Department of Biomedical Engineering, The University of Texas El Paso, El Paso, Texas 79968, United States
| | - Jaqueline Pena-Zacarias
- Department of Biological Sciences, The University of Texas El Paso, El Paso, Texas 79968, United States
| | - Elfa Beaven
- Department of Biomedical Engineering, The University of Texas El Paso, El Paso, Texas 79968, United States
| | - Md Ikhtiar Zahid
- Department of Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, Texas 79902, United States; Environmental Science & Engineering, The University of Texas El Paso, El Paso, Texas 79968, United States
| | - Sheikh Shafin Ahmad
- Department of Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, Texas 79902, United States; Environmental Science & Engineering and Aerospace Center (cSETR), The University of Texas El Paso, El Paso, Texas 79968, United States
| | - Rimpy Diwan
- Department of Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, Texas 79902, United States; Department of Biomedical Engineering, The University of Texas El Paso, El Paso, Texas 79968, United States
| | - Md Nurunnabi
- Department of Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, Texas 79902, United States; Department of Biomedical Engineering, Environmental Science & Engineering, and Aerospace Center (cSETR), The University of Texas El Paso, El Paso, Texas 79968, United States
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8
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Toksabay S, Leisegang M, Christ A, Härtl P, Krebs J, Marder TB, Haldar S, Heinze S, Bode M, Krueger A. Controlled Formation of Porous 2D Lattices from C 3 -symmetric Ph 6 -Me-Tribenzotriquinacene-OAc 3. Chemistry 2023; 29:e202203187. [PMID: 36346617 DOI: 10.1002/chem.202203187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 11/04/2022] [Accepted: 11/07/2022] [Indexed: 11/09/2022]
Abstract
The on-surface self-assembly of molecules to form holey nanographenes is a promising approach to control the properties of the resulting 2D lattice. Usually, planar molecules are utilized to prepare flat, structurally confined molecular layers, with only a few recent examples of warped precursors. However, control of the superstructures is limited thus far. Herein, we report the temperature-controlled self-assembly of a bowl-shaped, acetylated C3 -symmetric hexaphenyltribenzotriquinacene derivative on Cu(111). Combining scanning tunneling microscopy (STM) and density functional theory (DFT) confirms the formation of highly differing arrangements starting with π-stacked bowl-to-bowl dimers at low coverage at room temperature via chiral honeycomb structures, an intermediate trigonal superstructure, followed by a fully carbon-based, flattened hexagonal superstructure formed by on-surface deacetylation, which is proposed as a precursor for holey graphene networks with unique defect structures.
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Affiliation(s)
- Sinem Toksabay
- Institute for Organic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Markus Leisegang
- Physikalisches Institut Experimentelle Physik II, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Andreas Christ
- Physikalisches Institut Experimentelle Physik II, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Patrick Härtl
- Physikalisches Institut Experimentelle Physik II, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Johannes Krebs
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Todd B Marder
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Soumyajyoti Haldar
- Institute of Theoretical Physics and Astrophysics, University of Kiel, Leibnizstrasse 15, 24098, Kiel, Germany
| | - Stefan Heinze
- Institute of Theoretical Physics and Astrophysics, University of Kiel, Leibnizstrasse 15, 24098, Kiel, Germany
| | - Matthias Bode
- Physikalisches Institut Experimentelle Physik II, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Wilhelm Conrad Röntgen-Center for Complex Material Systems (RCCM), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Anke Krueger
- Institute for Organic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute of Organic Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
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9
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Fu B, Zhang RW, Fan X, Li S, Ma DS, Liu CC. 2D Ladder Polyborane: An Ideal Dirac Semimetal with a Multi-Field-Tunable Band Gap. ACS NANO 2023; 17:1638-1645. [PMID: 36596227 DOI: 10.1021/acsnano.2c11612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Hydrogen, a simple and magic element, has attracted increasing attention for its effective incorporation within solids and powerful manipulation of electronic states. Here, we show that hydrogenation tackles common problems in two-dimensional borophene, e.g., stability and applicability. As a prominent example, a ladder-like boron hydride sheet, named as 2D ladder polyborane, achieves the desired outcome, enjoying the cleanest scenario with an anisotropic and tilted Dirac cone, that can be fully depicted by a minimal two-band tight-binding model. Introducing external fields, such as an electric field or a circularly polarized light field, can effectively induce distinctive massive Dirac fermions, whereupon four types of multi-field-driven topological domain walls hosting tunable chirality and valley indexes are further established. Moreover, the 2D ladder polyborane is thermodynamically stable at room temperature and supports highly switchable Dirac fermions, providing an ideal platform for realizing and exploring the various multi-field-tunable electronic states.
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Affiliation(s)
- Botao Fu
- College of Physics and Electronic Engineering, Center for Computational Sciences, Sichuan Normal University, Chengdu, 610068, China
| | - Run-Wu Zhang
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing, 100081, China
- Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing, 100081, China
| | - Xiaotong Fan
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing, 100081, China
- Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing, 100081, China
| | - Si Li
- School of Physics, Northwest University, Xi'an, 710127, China
- Shaanxi Key Laboratory for Theoretical Physics Frontiers, Xi'an, 710127, China
| | - Da-Shuai Ma
- Institute for Structure and Function & Department of Physics, Chongqing University, Chongqing, 400044, China
| | - Cheng-Cheng Liu
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing, 100081, China
- Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing, 100081, China
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10
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Bian Y, Cheng J, Zhang Y, Sun H, Zhang J, Zhang X, Jin Q. Herringbone Reconstruction-Mediated assembly of 2-(Hydroxymethyl)benzimidazole molecules on Au(1 1 1) studied by scanning tunneling microscope. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Han M, Moe K. Light-Responsive Hexagonal Assemblies of Triangular Azo Dyes. Molecules 2022; 27:4380. [PMID: 35889253 PMCID: PMC9317042 DOI: 10.3390/molecules27144380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Revised: 07/05/2022] [Accepted: 07/05/2022] [Indexed: 12/01/2022] Open
Abstract
The rational design of small building block molecules and understanding their molecular assemblies are of fundamental importance in creating new stimuli-responsive organic architectures with desired shapes and functions. Based on the experimental results of light-induced conformational changes of four types of triangular azo dyes with different terminal functional groups, as well as absorption and fluorescence characteristics associated with their molecular assemblies, we report that aggregation-active emission enhancement (AIEE)-active compound (1) substituted with sterically crowded tert-butyl (t-Bu) groups showed approximately 35% light-induced molecular switching and had a strong tendency to assemble into highly stable hexagonal structures with AIEE characteristics. Their sizes were regulated from nanometer-scale hexagonal rods to micrometer-scale sticks depending on the concentration. This is in contrast to other triangular compounds with bromo (Br) and triphenylamine (TPA) substituents, which exhibited no photoisomerization and tended to form flexible fibrous structures. Moreover, non-contact exposure of the fluorescent hexagonal nanorods to ultraviolet (UV) light led to a dramatic hexagonal-to-amorphous structure transition. The resulting remarkable variations, such as in the contrast of microscopic images and fluorescence characteristics, were confirmed by various microscopic and spectroscopic measurements.
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Affiliation(s)
- Mina Han
- Department of Chemistry Education, Kongju National University, Gongju 32588, Korea;
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12
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Freeney SE, Slot MR, Gardenier TS, Swart I, Vanmaekelbergh D. Electronic Quantum Materials Simulated with Artificial Model Lattices. ACS NANOSCIENCE AU 2022; 2:198-224. [PMID: 35726276 PMCID: PMC9204828 DOI: 10.1021/acsnanoscienceau.1c00054] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 01/24/2022] [Accepted: 01/28/2022] [Indexed: 11/29/2022]
Abstract
![]()
The
band structure and electronic properties of a material are
defined by the sort of elements, the atomic registry in the crystal,
the dimensions, the presence of spin–orbit coupling, and the
electronic interactions. In natural crystals, the interplay of these
factors is difficult to unravel, since it is usually not possible
to vary one of these factors in an independent way, keeping the others
constant. In other words, a complete understanding of complex electronic
materials remains challenging to date. The geometry of two- and one-dimensional
crystals can be mimicked in artificial lattices. Moreover, geometries
that do not exist in nature can be created for the sake of further
insight. Such engineered artificial lattices can be better controlled
and fine-tuned than natural crystals. This makes it easier to vary
the lattice geometry, dimensions, spin–orbit coupling, and
interactions independently from each other. Thus, engineering and
characterization of artificial lattices can provide unique insights.
In this Review, we focus on artificial lattices that are built atom-by-atom
on atomically flat metals, using atomic manipulation in a scanning
tunneling microscope. Cryogenic scanning tunneling microscopy allows
for consecutive creation, microscopic characterization, and band-structure
analysis by tunneling spectroscopy, amounting in the analogue quantum
simulation of a given lattice type. We first review the physical elements
of this method. We then discuss the creation and characterization
of artificial atoms and molecules. For the lattices, we review works
on honeycomb and Lieb lattices and lattices that result in crystalline
topological insulators, such as the Kekulé and “breathing”
kagome lattice. Geometric but nonperiodic structures such as electronic
quasi-crystals and fractals are discussed as well. Finally, we consider
the option to transfer the knowledge gained back to real materials,
engineered by geometric patterning of semiconductor quantum wells.
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Affiliation(s)
- Saoirsé E. Freeney
- Condensed Matter and Interfaces, Debye Institute of Nanomaterial Science, University of Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands
| | - Marlou R. Slot
- Condensed Matter and Interfaces, Debye Institute of Nanomaterial Science, University of Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands
| | - Thomas S. Gardenier
- Condensed Matter and Interfaces, Debye Institute of Nanomaterial Science, University of Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands
| | - Ingmar Swart
- Condensed Matter and Interfaces, Debye Institute of Nanomaterial Science, University of Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands
| | - Daniel Vanmaekelbergh
- Condensed Matter and Interfaces, Debye Institute of Nanomaterial Science, University of Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands
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13
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Jeong JH, Kang S, Kim N, Joshi RK, Lee GH. Recent trends in covalent functionalization of 2D materials. Phys Chem Chem Phys 2022; 24:10684-10711. [DOI: 10.1039/d1cp04831g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Covalent functionalization of the surface is more crucial in 2D materials than in conventional bulk materials because of their atomic thinness, large surface-to-volume ratio, and uniform surface chemical potential. Because...
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14
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Wang X, Yang C, Song P, Li M, Liu Y, Sun H, Liu Y, Zheng H, Huang J, Zhu H. Ionic surfactants as assembly crosslinkers triggered supramolecular membrane with 2D↔3D conversion under multiple stimulus. J Colloid Interface Sci 2021; 609:627-636. [PMID: 34844735 DOI: 10.1016/j.jcis.2021.11.073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2021] [Revised: 11/12/2021] [Accepted: 11/13/2021] [Indexed: 11/17/2022]
Abstract
HYPOTHESIS General strategies leading to 2D assemblies promise a significant step forward in the development of supramolecular materials with diversity and superiority. Considering molecular packing parameter indicates a connection between molecular geometry and aggregate morphology, we predict the introduction of ionic surfactants as assembly crosslinker would be endowed to develop a methodology of 2D supramolecular assembles. EXPERIMENTS In this work, by introducing ionic surfactants such as sodium dodecylsulfate (SDS), the molecular packing parameter P in bolaamphiphile (A2G) system was increased, which successfully manipulated the transformation of the 3D vesicles into 2D membranes. This 2D membranes further showed excellent light and enzyme response, and thus 2D to 3D morphological conversion can be rationally controlled via UV/Vis light irradiation and alternate addition of β-CD and α-amylase. Significantly, the 2D feature revealed not only a remarkable fluorescence enhancement to luminescent molecules but also the ability to effectively remove pollutants from water through filtration. FINDINGS We report a general and facile strategy for the construction of 2D supramolecular membranes, initiated by introducing ionic surfactants as assembly crosslinker to increase P. In the existence of stimulus response factors, 2D↔3D morphological conversion can be further controlled in a flexible manner, which opens up a new paradigm leading to interconvertible supramolecular materials.
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Affiliation(s)
- Xuejiao Wang
- Fujian Provincial University Engineering Research Center of Industrial Biocatalysis, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, PR China; Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China.
| | - Chunlian Yang
- Fujian Provincial University Engineering Research Center of Industrial Biocatalysis, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, PR China
| | - Pengbo Song
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China
| | - Maodong Li
- School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, PR China
| | - Yuxin Liu
- Department of Biomolecular System, Max-Planck Institute for Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany
| | - Hao Sun
- Fujian Provincial University Engineering Research Center of Industrial Biocatalysis, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, PR China
| | - Yuting Liu
- Fujian Provincial University Engineering Research Center of Industrial Biocatalysis, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, PR China
| | - Hang Zheng
- Fujian Provincial University Engineering Research Center of Industrial Biocatalysis, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, PR China
| | - Jianbin Huang
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China.
| | - Hu Zhu
- Fujian Provincial University Engineering Research Center of Industrial Biocatalysis, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, PR China.
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15
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Lu S, Nam H, Xiao P, Liu M, Guo Y, Bai Y, Cheng Z, Deng J, Li Y, Zhou H, Henkelman G, Fiete GA, Gao HJ, MacDonald AH, Zhang C, Shih CK. PTCDA Molecular Monolayer on Pb Thin Films: An Unusual π-Electron Kondo System and Its Interplay with a Quantum-Confined Superconductor. PHYSICAL REVIEW LETTERS 2021; 127:186805. [PMID: 34767397 DOI: 10.1103/physrevlett.127.186805] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Accepted: 09/28/2021] [Indexed: 06/13/2023]
Abstract
The hybridization of magnetism and superconductivity has been an intriguing playground for correlated electron systems, hosting various novel physical phenomena. Usually, localized d or f electrons are central to magnetism. In this study, by placing a PTCDA (3,4,9,10-perylene tetracarboxylic dianhydride) molecular monolayer on ultrathin Pb films, we built a hybrid magnetism/superconductivity (M/SC) system consisting of only sp electronic levels. The magnetic moments reside in the unpaired molecular orbital originating from interfacial charge transfers. We reported distinctive tunneling spectroscopic features of such a Kondo screened π electron impurity lattice on a superconductor in the regime of T_{K}≫Δ, suggesting the formation of a two-dimensional bound states band. Moreover, moiré superlattices with tunable twist angle and the quantum confinement in the ultrathin Pb films provide easy and flexible implementations to tune the interplay between the Kondo physics and the superconductivity, which are rarely present in M/SC hybrid systems.
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Affiliation(s)
- Shuangzan Lu
- School of Physics and Technology, Wuhan University, Wuhan 430072, China
| | - Hyoungdo Nam
- Department of Physics, the University of Texas at Austin, Austin, Texas 78712, USA
| | - Penghao Xiao
- Department of Chemistry, the University of Texas at Austin, Austin, Texas 78712, USA
- Department of Physics & Atmospheric Science, Dalhousie University, Halifax, Nova Scotia B3H4J5, Canada
| | - Mengke Liu
- Department of Physics, the University of Texas at Austin, Austin, Texas 78712, USA
| | - Yanping Guo
- School of Physics and Technology, Wuhan University, Wuhan 430072, China
| | - Yusong Bai
- School of Physics and Technology, Wuhan University, Wuhan 430072, China
| | - Zhengbo Cheng
- School of Physics and Technology, Wuhan University, Wuhan 430072, China
| | - Jinghao Deng
- School of Physics and Technology, Wuhan University, Wuhan 430072, China
| | - Yanxing Li
- Department of Physics, the University of Texas at Austin, Austin, Texas 78712, USA
| | - Haitao Zhou
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Graeme Henkelman
- Department of Chemistry, the University of Texas at Austin, Austin, Texas 78712, USA
| | - Gregory A Fiete
- Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
- Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Hong-Jun Gao
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Allan H MacDonald
- Department of Physics, the University of Texas at Austin, Austin, Texas 78712, USA
| | - Chendong Zhang
- School of Physics and Technology, Wuhan University, Wuhan 430072, China
| | - Chih-Kang Shih
- Department of Physics, the University of Texas at Austin, Austin, Texas 78712, USA
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16
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Abbasian H, Rochefort A. Electrostatic patterning on graphene with dipolar self-assembly. Phys Chem Chem Phys 2021; 23:22014-22021. [PMID: 34570130 DOI: 10.1039/d1cp02272e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We have investigated the influence of electric dipole moment in different periodic two-dimensional network on the electronic structure properties of graphene. Although the control of doping level in graphene within a van der Waals heterostructure constitutes a difficult task, the dipolar nature of the different molecular stacks can be used to control its electrostatic properties. First, we demonstrate that the orientation and magnitude of the adsorbed molecular dipole moments allow to control the electrical behaviour of graphene, and acts as an electrostatic gate that shifts neutrality point of graphene to behave as n- or p-doped materials. Then, we show that the presence of local dipole moment in SAN induces an electrostatic potential in graphene that creates well-defined patterned regions with different electronic characteristics that would influence the confinement of molecular species.
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Affiliation(s)
- Hamed Abbasian
- Engineering Physics Department, Polytechnique Montréal, Canada.
| | - Alain Rochefort
- Engineering Physics Department, Polytechnique Montréal, Canada.
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17
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Rheinfrank E, Pörtner M, Nuñez Beyerle MDC, Haag F, Deimel PS, Allegretti F, Seufert K, Barth JV, Bocquet ML, Feulner P, Auwärter W. Actinide Coordination Chemistry on Surfaces: Synthesis, Manipulation, and Properties of Thorium Bis(porphyrinato) Complexes. J Am Chem Soc 2021; 143:14581-14591. [PMID: 34477375 DOI: 10.1021/jacs.1c04982] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Actinide-based metal-organic complexes and coordination architectures encompass intriguing properties and functionalities but are still largely unexplored on surfaces. We introduce the in situ synthesis of actinide tetrapyrrole complexes under ultrahigh-vacuum conditions, on both a metallic support and a 2D material. Specifically, exposure of a tetraphenylporphyrin (TPP) multilayer to an elemental beam of thorium followed by a temperature-programmed reaction and desorption of surplus molecules yields bis(porphyrinato)thorium (Th(TPP)2) assemblies on Ag(111) and hexagonal boron nitride/Cu(111). A multimethod characterization including X-ray photoelectron spectroscopy, scanning tunneling microscopy, temperature-programmed desorption, and complementary density functional theory modeling provides insights into conformational and electronic properties. Supramolecular assemblies of Th(TPP)2 as well as individual double-deckers are addressed with submolecular precision, e.g., demonstrating the reversible rotation of the top porphyrin in Th(TPP)2 by molecular manipulation. Our findings thus demonstrate prospects for actinide-based functional nanoarchitectures.
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Affiliation(s)
- Erik Rheinfrank
- Physics Department E20, Technical University of Munich, D-85748 Garching, Germany
| | - Mathias Pörtner
- Physics Department E20, Technical University of Munich, D-85748 Garching, Germany
| | | | - Felix Haag
- Physics Department E20, Technical University of Munich, D-85748 Garching, Germany
| | - Peter S Deimel
- Physics Department E20, Technical University of Munich, D-85748 Garching, Germany
| | - Francesco Allegretti
- Physics Department E20, Technical University of Munich, D-85748 Garching, Germany
| | - Knud Seufert
- Physics Department E20, Technical University of Munich, D-85748 Garching, Germany
| | - Johannes V Barth
- Physics Department E20, Technical University of Munich, D-85748 Garching, Germany
| | - Marie-Laure Bocquet
- PASTEUR, Départment de Chimie, Ecole Normale Supérieure, PSL University, Sorbonne Université, CNRS, F-75005 Paris, France
| | - Peter Feulner
- Physics Department E20, Technical University of Munich, D-85748 Garching, Germany
| | - Willi Auwärter
- Physics Department E20, Technical University of Munich, D-85748 Garching, Germany
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18
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Maier S, Stöhr M. Molecular assemblies on surfaces: towards physical and electronic decoupling of organic molecules. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2021; 12:950-956. [PMID: 34540518 PMCID: PMC8404214 DOI: 10.3762/bjnano.12.71] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 08/04/2021] [Indexed: 06/13/2023]
Affiliation(s)
- Sabine Maier
- Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - Meike Stöhr
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands
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19
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Kumar A, Banerjee K, Ervasti MM, Kezilebieke S, Dvorak M, Rinke P, Harju A, Liljeroth P. Electronic Characterization of a Charge-Transfer Complex Monolayer on Graphene. ACS NANO 2021; 15:9945-9954. [PMID: 34028269 PMCID: PMC8223480 DOI: 10.1021/acsnano.1c01430] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 05/19/2021] [Indexed: 06/12/2023]
Abstract
Organic charge-transfer complexes (CTCs) formed by strong electron acceptor and strong electron donor molecules are known to exhibit exotic effects such as superconductivity and charge density waves. We present a low-temperature scanning tunneling microscopy and spectroscopy (LT-STM/STS) study of a two-dimensional (2D) monolayer CTC of tetrathiafulvalene (TTF) and fluorinated tetracyanoquinodimethane (F4TCNQ), self-assembled on the surface of oxygen-intercalated epitaxial graphene on Ir(111) (G/O/Ir(111)). We confirm the formation of the charge-transfer complex by dI/dV spectroscopy and direct imaging of the singly occupied molecular orbitals. High-resolution spectroscopy reveals a gap at zero bias, suggesting the formation of a correlated ground state at low temperatures. These results point to the possibility to realize and study correlated ground states in charge-transfer complex monolayers on weakly interacting surfaces.
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Affiliation(s)
- Avijit Kumar
- School
of Basic Sciences, Indian Institute of Technology
Bhubaneswar, Jatni, 752050 Khurda, India
- Department
of Applied Physics, Aalto University, FI-00076 Aalto, Finland
| | - Kaustuv Banerjee
- Department
of Applied Physics, Aalto University, FI-00076 Aalto, Finland
| | - Mikko M. Ervasti
- Department
of Applied Physics, Aalto University, FI-00076 Aalto, Finland
| | | | - Marc Dvorak
- Department
of Applied Physics, Aalto University, FI-00076 Aalto, Finland
| | - Patrick Rinke
- Department
of Applied Physics, Aalto University, FI-00076 Aalto, Finland
| | - Ari Harju
- Department
of Applied Physics, Aalto University, FI-00076 Aalto, Finland
- Varian
Medical Systems Finland, FI-00270 Helsinki, Finland
| | - Peter Liljeroth
- Department
of Applied Physics, Aalto University, FI-00076 Aalto, Finland
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20
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Zhang Q, Huang Z, Hou Y, Yuan P, Xu Z, Yang H, Song X, Chen Y, Yang H, Zhang T, Liu L, Gao HJ, Wang Y. Tuning Molecular Superlattice by Charge-Density-Wave Patterns in Two-Dimensional Monolayer Crystals. J Phys Chem Lett 2021; 12:3545-3551. [PMID: 33818110 DOI: 10.1021/acs.jpclett.1c00230] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Charge density wave (CDW) in two-dimensional (2D) crystals plays a vital role in tuning the interface structures and properties. However, how the CDW tunes the self-assembled molecular superlattice still remains unclear. In this study, we investigated the self-assembled manganese phthalocyanine (MnPc) molecular superlattice on single-layered 1T- and 2H-NbSe2 crystals under regulation by distinct CDW patterns. We observe that, in low coverage, MnPc molecules preferentially adsorb on 2H-NbSe2 compared to 1T-NbSe2. With increasing coverage, MnPc can form a highly ordered superlattice on 2H-NbSe2; however, it is randomly distributed on 1T-NbSe2. We reveal a perfect geometric commensurability between the molecular superlattice and intrinsic CDW pattern in 2H-NbSe2 and a poor commensurability for that of 1T-NbSe2. We believe that the subtly different geometric commensurability dominates the different adsorption and arrangement of the molecular superlattices on 2D CDW patterns. Our study provides a pioneering approach for tuning the molecular superlattices using the CDW patterns.
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Affiliation(s)
- Quanzhen Zhang
- MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
| | - Zeping Huang
- MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
| | - Yanhui Hou
- MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
| | - Peiwen Yuan
- MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
| | - Ziqiang Xu
- MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
| | - Han Yang
- MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
| | - Xuan Song
- MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
| | - Yaoyao Chen
- MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
| | - Huixia Yang
- MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
| | - Teng Zhang
- MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
| | - Liwei Liu
- MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
| | - Hong-Jun Gao
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Yeliang Wang
- MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
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21
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Zhou X, Liu Y, Jin Z, Huang M, Zhou F, Song J, Qu J, Zeng Y, Qian P, Wong W. Solar-Driven Hydrogen Generation Catalyzed by g-C 3N 4 with Poly(platinaynes) as Efficient Electron Donor at Low Platinum Content. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2002465. [PMID: 33643789 PMCID: PMC7887596 DOI: 10.1002/advs.202002465] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 10/30/2020] [Indexed: 05/31/2023]
Abstract
A metal-complex-modified graphitic carbon nitride (g-C3N4) bulk heterostructure is presented here as a promising alternative to high-cost noble metals as artificial photocatalysts. Theoretical and experimental studies of the spectral and physicochemical properties of three structurally similar molecules Fo-D, Pt-D, and Pt-P confirm that the Pt(II) acetylide group effectively expands the electron delocalization and adjusts the molecular orbital levels to form a relatively narrow bandgap. Using these molecules, the donor-acceptor assemblies Fo-D@CN, Pt-D@CN, and Pt-P@CN are formed with g-C3N4. Among these assemblies, the Pt(II) acetylide-based composite materials Pt-D@CN and Pt-P@CN with bulk heterojunction morphologies and extremely low Pt weight ratios of 0.19% and 0.24%, respectively, exhibit the fastest charge transfer and best light-harvesting efficiencies. Among the tested assemblies, 10 mg Pt-P@CN without any Pt metal additives exhibits a significantly improved photocatalytic H2 generation rate of 1.38 µmol h-1 under simulated sunlight irradiation (AM1.5G, filter), which is sixfold higher than that of the pristine g-C3N4.
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Affiliation(s)
- Xuan Zhou
- College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen518060P. R. China
- Department of Applied Biology and Chemical TechnologyThe Hong Kong Polytechnic University (PolyU)Hung HomHong KongP. R. China
- PolyU Shenzhen Research InstituteShenzhen518057P. R. China
| | - Yurong Liu
- Department of Applied Biology and Chemical TechnologyThe Hong Kong Polytechnic University (PolyU)Hung HomHong KongP. R. China
- PolyU Shenzhen Research InstituteShenzhen518057P. R. China
| | - Zhengyuan Jin
- College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen518060P. R. China
| | - Meina Huang
- College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen518060P. R. China
| | - Feifan Zhou
- College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen518060P. R. China
| | - Jun Song
- College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen518060P. R. China
| | - Junle Qu
- College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen518060P. R. China
| | - Yu‐Jia Zeng
- College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen518060P. R. China
| | - Peng‐Cheng Qian
- Key Laboratory of Environmental Functional Materials Technology and Application of Wenzhou CityInstitute of New Materials and IndustryCollege of Chemistry and Materials EngineeringWenzhou UniversityWenzhou325035P. R. China
| | - Wai‐Yeung Wong
- Department of Applied Biology and Chemical TechnologyThe Hong Kong Polytechnic University (PolyU)Hung HomHong KongP. R. China
- PolyU Shenzhen Research InstituteShenzhen518057P. R. China
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22
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Calavalle F, Dreher P, Surdendran AP, Wan W, Timpel M, Verucchi R, Rogero C, Bauch T, Lombardi F, Casanova F, Nardi MV, Ugeda MM, Hueso LE, Gobbi M. Tailoring Superconductivity in Large-Area Single -Layer NbSe 2 via Self-Assembled Molecular Adlayers. NANO LETTERS 2021; 21:136-143. [PMID: 33274947 DOI: 10.1021/acs.nanolett.0c03386] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Two-dimensional transition metal dichalcogenides (TMDs) represent an ideal testbench for the search of materials by design, because their optoelectronic properties can be manipulated through surface engineering and molecular functionalization. However, the impact of molecules on intrinsic physical properties of TMDs, such as superconductivity, remains largely unexplored. In this work, the critical temperature (TC) of large-area NbSe2 monolayers is manipulated, employing ultrathin molecular adlayers. Spectroscopic evidence indicates that aligned molecular dipoles within the self-assembled layers act as a fixed gate terminal, collectively generating a macroscopic electrostatic field on NbSe2. This results in an ∼55% increase and a 70% decrease in TC depending on the electric field polarity, which is controlled via molecular selection. The reported functionalization, which improves the air stability of NbSe2, is efficient, practical, up-scalable, and suited to functionalize large-area TMDs. Our results indicate the potential of hybrid 2D materials as a novel platform for tunable superconductivity.
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Affiliation(s)
| | - Paul Dreher
- Donostia International Physics Center DIPC, Donostia-San Sebastian, Basque Country 20018, Spain
| | - Ananthu P Surdendran
- Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg SE-41296, Sweden
| | - Wen Wan
- Donostia International Physics Center DIPC, Donostia-San Sebastian, Basque Country 20018, Spain
| | - Melanie Timpel
- Institute of Materials for Electronics and Magnetism, IMEM-CNR, Trento unit c/o Fondazione Bruno Kessler, Via alla Cascata 56/C, Povo, Trento IT-38123, Italy
| | - Roberto Verucchi
- Institute of Materials for Electronics and Magnetism, IMEM-CNR, Trento unit c/o Fondazione Bruno Kessler, Via alla Cascata 56/C, Povo, Trento IT-38123, Italy
| | - Celia Rogero
- Materials Physics Center CSIC-UPV/EHU, 20018 Donostia-San Sebastian, Spain
- Donostia International Physics Center DIPC, Donostia-San Sebastian, Basque Country 20018, Spain
| | - Thilo Bauch
- Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg SE-41296, Sweden
| | - Floriana Lombardi
- Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg SE-41296, Sweden
| | - Fèlix Casanova
- CIC nanoGUNE BRTA, Donostia-San Sebastian, Basque Country 20018, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, Basque Country 48013, Spain
| | - Marco Vittorio Nardi
- Institute of Materials for Electronics and Magnetism, IMEM-CNR, Trento unit c/o Fondazione Bruno Kessler, Via alla Cascata 56/C, Povo, Trento IT-38123, Italy
| | - Miguel M Ugeda
- Materials Physics Center CSIC-UPV/EHU, 20018 Donostia-San Sebastian, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, Basque Country 48013, Spain
- Donostia International Physics Center DIPC, Donostia-San Sebastian, Basque Country 20018, Spain
| | - Luis E Hueso
- CIC nanoGUNE BRTA, Donostia-San Sebastian, Basque Country 20018, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, Basque Country 48013, Spain
| | - Marco Gobbi
- CIC nanoGUNE BRTA, Donostia-San Sebastian, Basque Country 20018, Spain
- Materials Physics Center CSIC-UPV/EHU, 20018 Donostia-San Sebastian, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, Basque Country 48013, Spain
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23
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Creating a regular array of metal-complexing molecules on an insulator surface at room temperature. Nat Commun 2020; 11:6424. [PMID: 33349635 PMCID: PMC7752910 DOI: 10.1038/s41467-020-20189-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Accepted: 11/11/2020] [Indexed: 11/08/2022] Open
Abstract
Controlling self-assembled nanostructures on bulk insulators at room temperature is crucial towards the fabrication of future molecular devices, e.g., in the field of nanoelectronics, catalysis and sensor applications. However, at temperatures realistic for operation anchoring individual molecules on electrically insulating support surfaces remains a big challenge. Here, we present the formation of an ordered array of single anchored molecules, dimolybdenum tetraacetate, on the (10.4) plane of calcite (CaCO3). Based on our combined study of atomic force microscopy measurements and density functional theory calculations, we show that the molecules neither diffuse nor rotate at room temperature. The strong anchoring is explained by electrostatic interaction of an ideally size-matched molecule. Especially at high coverage, a hard-sphere repulsion of the molecules and the confinement at the calcite surface drives the molecules to form locally ordered arrays, which is conceptually different from attractive linkers as used in metal-organic frameworks. Our work demonstrates that tailoring the molecule-surface interaction opens up the possibility for anchoring individual metal-complexing molecules into ordered arrays.
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24
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Zhou DD, Wang J, Chen P, He Y, Wu JX, Gao S, Zhong Z, Du Y, Zhong D, Zhang JP. On-surface isostructural transformation from a hydrogen-bonded network to a coordination network for tuning the pore size and guest recognition. Chem Sci 2020; 12:1272-1277. [PMID: 34163889 PMCID: PMC8179111 DOI: 10.1039/d0sc05147k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Accepted: 11/13/2020] [Indexed: 11/21/2022] Open
Abstract
Rational manipulation of supramolecular structures on surfaces is of great importance and challenging. We show that imidazole-based hydrogen-bonded networks on a metal surface can transform into an isostructural coordination network for facile tuning of the pore size and guest recognition behaviours. Deposition of triangular-shaped benzotrisimidazole (H3btim) molecules on Au(111)/Ag(111) surfaces gives honeycomb networks linked by double N-H⋯N hydrogen bonds. While the H3btim hydrogen-bonded networks on Au(111) evaporate above 453 K, those on Ag(111) transform into isostructural [Ag3(btim)] coordination networks based on double N-Ag-N bonds at 423 K, by virtue of the unconventional metal-acid replacement reaction (Ag reduces H+). The transformation expands the pore diameter of the honeycomb networks from 3.8 Å to 6.9 Å, giving remarkably different host-guest recognition behaviours for fullerene and ferrocene molecules based on the size compatibility mechanism.
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Affiliation(s)
- Dong-Dong Zhou
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University Guangzhou 510275 China
| | - Jun Wang
- School of Physics, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University Guangzhou 510275 China
| | - Pin Chen
- National Supercomputer Center in Guangzhou, School of Data and Computer Science, Sun Yat-Sen University Guangzhou 510006 China
| | - Yangyong He
- School of Physics, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University Guangzhou 510275 China
| | - Jun-Xi Wu
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University Guangzhou 510275 China
| | - Sen Gao
- National Supercomputer Center in Guangzhou, School of Data and Computer Science, Sun Yat-Sen University Guangzhou 510006 China
| | - Zhihao Zhong
- School of Physics, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University Guangzhou 510275 China
| | - Yunfei Du
- National Supercomputer Center in Guangzhou, School of Data and Computer Science, Sun Yat-Sen University Guangzhou 510006 China
| | - Dingyong Zhong
- School of Physics, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University Guangzhou 510275 China
| | - Jie-Peng Zhang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University Guangzhou 510275 China
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25
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Guo H, Martínez-Galera AJ, Gómez-Rodríguez JM. C 60 self-orientation on hexagonal boron nitride induced by intermolecular coupling. NANOTECHNOLOGY 2020; 32:025711. [PMID: 33073772 DOI: 10.1088/1361-6528/abbbb2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A deep grasp of the properties of the interface between organic molecules and hexagonal boron nitride (h-BN) is essential for the full implementation of these two building blocks in the next generation of electronic devices. Here, using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS), we report on the geometric and electronic features of C60 evaporated on a single layer of h-BN grown on a Rh(110) surface under ultra-high vacuum. Two different molecular assemblies of C60 on the h-BN/Rh(110) surface were observed. The first STM study at room temperature (RT) and at low temperatures (40 K) looked at the molecular orientation of C60 on a two-dimensional layered material. Intramolecular-resolution images demonstrate the existence of a phase transition of C60 over the h-BN/Rh(110) surface similar to that found on bulk solid C60. At RT molecules exhibit random orientations, while at 40 K such rotational disorder vanishes and they adopt a common orientation over the h-BN/Rh(110) surface. The decrease in thermal energy allows recognition between C60 molecules, and they become equally oriented in the configuration at which the van der Waals intermolecular interactions are optimized. Bias-dependent submolecular features obtained by means of high-resolution STM images are interpreted as the highest occupied and lowest unoccupied molecular orbitals. STS data showed that fullerenes are electronically decoupled from the substrate, with a negligible charge transfer effect if any. Finally, the very early stages of multilayer growth were also investigated.
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Affiliation(s)
- Haojie Guo
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Madrid E-28049, Spain
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26
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Jović D, Jaćević V, Kuča K, Borišev I, Mrdjanovic J, Petrovic D, Seke M, Djordjevic A. The Puzzling Potential of Carbon Nanomaterials: General Properties, Application, and Toxicity. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E1508. [PMID: 32752020 PMCID: PMC7466546 DOI: 10.3390/nano10081508] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 07/27/2020] [Accepted: 07/29/2020] [Indexed: 02/07/2023]
Abstract
Being a member of the nanofamily, carbon nanomaterials exhibit specific properties that mostly arise from their small size. They have proved to be very promising for application in the technical and biomedical field. A wide spectrum of use implies the inevitable presence of carbon nanomaterials in the environment, thus potentially endangering their whole nature. Although scientists worldwide have conducted research investigating the impact of these materials, it is evident that there are still significant gaps concerning the knowledge of their mechanisms, as well as the prolonged and chronic exposure and effects. This manuscript summarizes the most prominent representatives of carbon nanomaterial groups, giving a brief review of their general physico-chemical properties, the most common use, and toxicity profiles. Toxicity was presented through genotoxicity and the activation of the cell signaling pathways, both including in vitro and in vivo models, mechanisms, and the consequential outcomes. Moreover, the acute toxicity of fullerenol, as one of the most commonly investigated members, was briefly presented in the final part of this review. Thinking small can greatly help us improve our lives, but also obliges us to deeply and comprehensively investigate all the possible consequences that could arise from our pure-hearted scientific ambitions and work.
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Affiliation(s)
- Danica Jović
- Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovića 3, 21000 Novi Sad, Serbia
| | - Vesna Jaćević
- Department for Experimental Toxicology and Pharmacology, National Poison Control Centre, Military Medical Academy, Crnotravska 17, 11040 Belgrade, Serbia
- Department of Pharmacological Science, Medical Faculty of the Military Medical Academy, University of Defence, Crnotravska 17, 11000 Belgrade, Serbia
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Rokitanskeho 62, 50003 Hradec Kralove, Czech Republic
| | - Kamil Kuča
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Rokitanskeho 62, 50003 Hradec Kralove, Czech Republic
- Biomedical Research Center, University Hospital Hradec Kralove, Sokolska 581, 50005 Hradec Kralove, Czech Republic
| | - Ivana Borišev
- Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovića 3, 21000 Novi Sad, Serbia
| | - Jasminka Mrdjanovic
- Oncology Institute of Vojvodina, Faculty of Medicine, University of Novi Sad, Put dr Goldmana 4, 21204 Sremska Kamenica, Serbia
| | - Danijela Petrovic
- Department of Natural Sciences and Management in Education, Faculty of Education Sombor, University of Novi Sad, Podgorička 4, 25101 Sombor, Serbia
| | - Mariana Seke
- Institute of Nuclear Sciences "Vinca", University of Belgrade, Mike Petrovića Alasa 12-14, 11351 Vinča, Belgrade, Serbia
| | - Aleksandar Djordjevic
- Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovića 3, 21000 Novi Sad, Serbia
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27
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Vural M, Zhu H, Pena-Francesch A, Jung H, Allen BD, Demirel MC. Self-Assembly of Topologically Networked Protein-Ti 3C 2T x MXene Composites. ACS NANO 2020; 14:6956-6967. [PMID: 32437121 DOI: 10.1021/acsnano.0c01431] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Hierarchical organization plays an important role in the stunning physical properties of natural and synthetic composites. Limits on the physical properties of such composites are generally defined by percolation theory and can be systematically altered using the volumetric filler fraction of the inorganic/organic phase. In natural composites, organic materials such as proteins that interact with inorganic filler materials can further alter the hierarchical order and organization of the composite via topological interactions, expanding the limits of the physical properties defined by percolation theory. However, existing polymer systems do not offer a topological parameter that can systematically modulate the assembly characteristics of composites. Here, we present a composite based on proteins and titanium carbide (Ti3C2Tx) MXene that manifests a topological network that regulates the organization, and hence physical properties, of these biomimetic composites. We designed, recombinantly expressed, and purified synthetic proteins consisting of polypeptides with repeating amino acid sequences (tandem repeats) that have the ability to self-assemble into topologically networked biomaterials. We demonstrated that the interlayer distance between MXene sheets can be controlled systematically by the number of tandem repeat units. We varied the filler fraction and number of tandem repeat units to regulate the in-plane and out-of-plane electrical conductivities of these composites. Once Ti3C2Tx MXene sheets are separated enough to facilitate formation of cross-links in our proteins with the number of tandem repeat units reaching 11, the linear I-V characteristics of the composites switched into nonlinear I-V curves with a distinct hysteresis for out-of-plane electron transport, while the in-plane I-V characteristics remained linear. This highlights the impact of synthetic protein templates, which can be designed to modulate electronic transport in composites both isotropically and anisotropically.
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Affiliation(s)
- Mert Vural
- Center for Research on Advanced Fiber Technologies (CRAFT), Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Haoyue Zhu
- Center for Research on Advanced Fiber Technologies (CRAFT), Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Abdon Pena-Francesch
- Center for Research on Advanced Fiber Technologies (CRAFT), Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Huihun Jung
- Center for Research on Advanced Fiber Technologies (CRAFT), Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Benjamin D Allen
- Huck Institutes of Life Sciences, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Melik C Demirel
- Center for Research on Advanced Fiber Technologies (CRAFT), Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Huck Institutes of Life Sciences, Pennsylvania State University, University Park, Pennsylvania 16802, United States
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28
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Jaroch T, Maranda-Niedbała A, Krzyżewska K, Kotwica K, Bujak P, Skórka Ł, Zagórska M, Proń A, Nowakowski R. Self-Assembly Properties of Solution Processable, Electroactive Alkoxy, and Alkylthienylene Derivatives of Fused Benzoacridines: A Scanning Tunneling Microscopy Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:5417-5427. [PMID: 32340450 PMCID: PMC7588136 DOI: 10.1021/acs.langmuir.9b03966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 04/27/2020] [Indexed: 06/11/2023]
Abstract
Self-organization in mono- and bilayers on HOPG of two groups of benz[5,6]acridino[2,1,9,8-klmna]acridine derivatives, namely, 8,16-dialkoxybenzo[h]benz[5,6]acridino[2,1,9,8-klmna]acridines with an increasing alkoxy substituent length and 8,16-bis(3- or 4- or 5-octylthiophen-2-yl)benzo[h]benz[5,6]acridino[2,1,9,8-klmna]acridines, i.e., three positional isomers of the same benzoacridine, is investigated by scanning tunneling microscopy. The layers were deposited from a solution of the adsorbate (in hexane or dichloromethane) and imaged ex situ at molecular resolution. In all cases, the resulting two-dimensional (2D) supramolecular organization is governed by the interactions between large, fused heteroaromatic cores that form densely packed rows separated by areas covered by substituents. In 8,16-dialkoxybenzo[h]benz[5,6]acridino[2,1,9,8-klmna]acridines, the alkoxy substituents, separating the rows of densely packed cores, are interdigitated. An increasing substituent length leads to an intuitively expected increase in this 2D unit cell parameter that corresponds to the orientation of the substituent in the monolayer. In the case of 8,16-bis(3- or 4- or 5-octylthiophen-2-yl)benzo[h]benz[5,6]acridino[2,1,9,8-klmna]acridine positional isomers, the self-assembly processes are more complex. Although the determined 2D unit cell is in all cases essentially the same, the role of alkylthienylene substituents in layer formation is distinctly different. Thus, the formation of monolayers and bilayers is very sensitive to isomerism. 8,16-Bis(5-octylthiophen-2-yl)benzo[h]benz[5,6]acridino[2,1,9,8-klmna]acridine is capable of forming the most stable monolayer and the most labile bilayer. In the case of 8,16-bis(3-octylthiophen-2-yl)benzo[h]benz[5,6]acridino[2,1,9,8-klmna]acridine, an inverse phenomenon is observed leading to the most labile monolayer and the most stable bilayer. These differences are rationalized in terms of dissimilar molecular geometries of the studied isomers and different interdigitation patterns in their 2D supramolecular structures.
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Affiliation(s)
- Tomasz Jaroch
- Institute
of Physical Chemistry, Polish Academy of
Sciences, Kasprzaka 44/52, 01-224 Warszawa, Poland
| | | | - Klaudyna Krzyżewska
- Institute
of Physical Chemistry, Polish Academy of
Sciences, Kasprzaka 44/52, 01-224 Warszawa, Poland
| | - Kamil Kotwica
- Institute
of Physical Chemistry, Polish Academy of
Sciences, Kasprzaka 44/52, 01-224 Warszawa, Poland
- Warsaw
University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warszawa, Poland
| | - Piotr Bujak
- Warsaw
University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warszawa, Poland
| | - Łukasz Skórka
- Warsaw
University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warszawa, Poland
| | - Małgorzata Zagórska
- Warsaw
University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warszawa, Poland
| | - Adam Proń
- Warsaw
University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warszawa, Poland
| | - Robert Nowakowski
- Institute
of Physical Chemistry, Polish Academy of
Sciences, Kasprzaka 44/52, 01-224 Warszawa, Poland
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29
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Chen C, Zhang S, Tu B, Meng T, Li J, Qian Y, Li P, Liu B, Duan W, Xu H, Zhao F, Peng Y, Li J, Zeng Q. Solvent-Dependent Core-Modified Rubyrin Self-Assembly at Liquid/Solid Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:3879-3886. [PMID: 32212611 DOI: 10.1021/acs.langmuir.9b03867] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Scanning tunneling microscopy (STM) was utilized to disclose four novel core-modified rubyrin self-assembly behaviors on the highly-oriented pyrolytic graphite (HOPG) surface, of which N2S4-OR(1)/N2Se4-OR(2) had no phenanthrene pyrrole ring and N2S4-OR(3)/N2Se4-OR(4) had phenanthrene-fused pyrrole rings and meso-aryl substituents. It was discovered that the core-modified rubyrin could self-assemble into either face-on or edge-on monolayer structures selectively at the liquid/HOPG interface in different solvents. There was an obvious solvent-dependent self-assembly for N2S4-OR(3)/N2Se4-OR(4), which adopted an edge-on and face-on structure in 1-phenyloctane and 1-heptanoic acid solvents, respectively, whereas N2S4-OR(1)/N2Se4-OR(2) showed no obvious difference in the assembly structure, which both adopted a face-on structure in the two solvents. Density functional theory (DFT) calculations were also utilized to reveal the relevant self-assembly mechanisms. This study shows a typical solvent effect regulating core-modified rubyrin self-assembly, which is essential for porphyrin-based functional devices' design and manufacture.
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Affiliation(s)
- Chen Chen
- Department of Chemistry, School of Science, Beijing Jiaotong University, Beijing 100044, China
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology (NCNST), Beijing 100190, China
| | - Siqi Zhang
- Department of Chemistry, School of Science, Beijing Jiaotong University, Beijing 100044, China
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology (NCNST), Beijing 100190, China
| | - Bin Tu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology (NCNST), Beijing 100190, China
| | - Ting Meng
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology (NCNST), Beijing 100190, China
- College of Chemical Engineering Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals, Nanjing Forestry University, Nanjing 210037, China
| | - Jianqiao Li
- Department of Chemistry, School of Science, Beijing Jiaotong University, Beijing 100044, China
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology (NCNST), Beijing 100190, China
| | - Yuxin Qian
- Department of Chemistry, School of Science, Beijing Jiaotong University, Beijing 100044, China
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology (NCNST), Beijing 100190, China
| | - Pengfei Li
- College of Chemical Engineering Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals, Nanjing Forestry University, Nanjing 210037, China
| | - Bo Liu
- Department of Chemistry, School of Science, Beijing Jiaotong University, Beijing 100044, China
| | - Wubiao Duan
- Department of Chemistry, School of Science, Beijing Jiaotong University, Beijing 100044, China
| | - Haijun Xu
- College of Chemical Engineering Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals, Nanjing Forestry University, Nanjing 210037, China
| | - Fengying Zhao
- Jiangxi College of Applied Technology, Ganzhou 341000, China
- Engineering Research Center of Nano-Geo Materials of Ministry of Education, China University of Geosciences, Wuhan 430074, China
| | - Yang Peng
- Jiangxi College of Applied Technology, Ganzhou 341000, China
- Engineering Research Center of Nano-Geo Materials of Ministry of Education, China University of Geosciences, Wuhan 430074, China
| | - Jing Li
- Jiangxi College of Applied Technology, Ganzhou 341000, China
- Engineering Research Center of Nano-Geo Materials of Ministry of Education, China University of Geosciences, Wuhan 430074, China
| | - Qingdao Zeng
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology (NCNST), Beijing 100190, China
- Center of Materials Science and Optoelectonics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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30
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Freimann SA, Zare D, Housecroft CE, Constable EC. The SALSAC approach: comparing the reactivity of solvent-dispersed nanoparticles with nanoparticulate surfaces. NANOSCALE ADVANCES 2020; 2:679-690. [PMID: 36133249 PMCID: PMC9418069 DOI: 10.1039/c9na00488b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 12/12/2019] [Indexed: 06/16/2023]
Abstract
We demonstrate that the 'surface-as-ligand, surface-as-complex' (SALSAC) approach that we have established for annealed nanoparticulate TiO2 surfaces can be successfully applied to nanoparticles (NPs) dispersed in solution. Commercial TiO2 NPs have been activated by initial treatment with aqueous HNO3 followed by dispersion in water and heating under microwave conditions. We have functionalized the activated NPs with anchoring ligands 1-4; 1-3 contain one or two phosphonic acid anchoring groups and 4 has two carboxylic acid anchors; ligands 1, 2 and 4 contain 6,6'-dimethyl-2,2'-bipyridine (Me2bpy) metal binding domains and 3 contains a 2,2':6',2''-terpyridine (tpy) unit. Ligand functionalization of the activated NPs has been validated using infrared and 1H NMR spectroscopies, and thermogravimetric analysis. NPs functionalized with 1, 2 and 4 react with [Cu(MeCN)4][PF6] and those with 3 react with FeCl2·4H2O; metal binding has been investigated using solid-state absorption spectroscopy and scanning electron microscopy (SEM). Competitive binding of ligands 1-4 to TiO2 NPs has been investigated and shows preferential binding of phosphonic acid over carboxylic acid anchors. For the phosphonic acids, the binding orders are 3 > 1 > 2 which is rationalized in terms of relative pK a values (phosphonic acid and [HMe2bpy]+ or [Htpy]+) and the number of anchoring groups in the ligands. Ligand exchange between ligand-functionalized NPs and homoleptic metal complexes gives NPs functionalized with heteroleptic copper(i) or iron(ii) complexes.
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Affiliation(s)
- Sven A Freimann
- Department of Chemistry, University of Basel BPR 1096, Mattenstrasse 24a CH-4058 Basel Switzerland
| | - Davood Zare
- Department of Chemistry, University of Basel BPR 1096, Mattenstrasse 24a CH-4058 Basel Switzerland
| | - Catherine E Housecroft
- Department of Chemistry, University of Basel BPR 1096, Mattenstrasse 24a CH-4058 Basel Switzerland
| | - Edwin C Constable
- Department of Chemistry, University of Basel BPR 1096, Mattenstrasse 24a CH-4058 Basel Switzerland
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31
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Zimmermann DM, Seufert K, Ðorđević L, Hoh T, Joshi S, Marangoni T, Bonifazi D, Auwärter W. Self-assembly and spectroscopic fingerprints of photoactive pyrenyl tectons on hBN/Cu(111). BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2020; 11:1470-1483. [PMID: 33083195 PMCID: PMC7537405 DOI: 10.3762/bjnano.11.130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 09/03/2020] [Indexed: 05/06/2023]
Abstract
The controlled modification of electronic and photophysical properties of polycyclic aromatic hydrocarbons by chemical functionalization, adsorption on solid supports, and supramolecular organization is the key to optimize the application of these compounds in (opto)electronic devices. Here, we present a multimethod study comprehensively characterizing a family of pyridin-4-ylethynyl-functionalized pyrene derivatives in different environments. UV-vis measurements in toluene solutions revealed absorption at wavelengths consistent with density functional theory (DFT) calculations, while emission experiments showed a high fluorescence quantum yield. Scanning tunneling microscopy (STM) and spectroscopy (STS) measurements of the pyrene derivatives adsorbed on a Cu(111)-supported hexagonal boron nitride (hBN) decoupling layer provided access to spatially and energetically resolved molecular electronic states. We demonstrate that the pyrene electronic gap is reduced with an increasing number of substituents. Furthermore, we discuss the influence of template-induced gating and supramolecular organization on the energies of distinct molecular orbitals. The selection of the number and positioning of the pyridyl termini in tetrasubstituted, trans- and cis-like-disubstituted derivatives governed the self-assembly of the pyrenyl core on the nanostructured hBN support, affording dense-packed arrays and intricate porous networks featuring a kagome lattice.
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Affiliation(s)
- Domenik M Zimmermann
- Physics Department E20, Technical University of Munich, James-Franck-Straße 1, D-85748 Garching, Germany
| | - Knud Seufert
- Physics Department E20, Technical University of Munich, James-Franck-Straße 1, D-85748 Garching, Germany
| | - Luka Ðorđević
- The School of Chemistry, Cardiff University, UK-CF10 3AT Cardiff, United Kingdom
| | - Tobias Hoh
- Physics Department E20, Technical University of Munich, James-Franck-Straße 1, D-85748 Garching, Germany
| | - Sushobhan Joshi
- Physics Department E20, Technical University of Munich, James-Franck-Straße 1, D-85748 Garching, Germany
| | - Tomas Marangoni
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, I-34127 Trieste, Italy
| | - Davide Bonifazi
- The School of Chemistry, Cardiff University, UK-CF10 3AT Cardiff, United Kingdom
- Institute of Organic Chemistry, Faculty of Chemistry, University of Vienna, Währinger Str. 38, 1090 Vienna, Austria
| | - Willi Auwärter
- Physics Department E20, Technical University of Munich, James-Franck-Straße 1, D-85748 Garching, Germany
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32
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Gaulding EA, Hao J, Kang HS, Miller EM, Habisreutinger SN, Zhao Q, Hazarika A, Sercel PC, Luther JM, Blackburn JL. Conductivity Tuning via Doping with Electron Donating and Withdrawing Molecules in Perovskite CsPbI 3 Nanocrystal Films. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1902250. [PMID: 31074911 DOI: 10.1002/adma.201902250] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Indexed: 05/03/2023]
Abstract
Doping of semiconductors enables fine control over the excess charge carriers, and thus the overall electronic properties, crucial to many technologies. Controlled doping in lead-halide perovskite semiconductors has thus far proven to be difficult. However, lower dimensional perovskites such as nanocrystals, with their high surface-area-to-volume ratio, are particularly well-suited for doping via ground-state molecular charge transfer. Here, the tunability of the electronic properties of perovskite nanocrystal arrays is detailed using physically adsorbed molecular dopants. Incorporation of the dopant molecules into electronically coupled CsPbI3 nanocrystal arrays is confirmed via infrared and photoelectron spectroscopies. Untreated CsPbI3 nanocrystal films are found to be slightly p-type with increasing conductivity achieved by incorporating the electron-accepting dopant 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4 TCNQ) and decreasing conductivity for the electron-donating dopant benzyl viologen. Time-resolved spectroscopic measurements reveal the time scales of Auger-mediated recombination in the presence of excess electrons or holes. Microwave conductance and field-effect transistor measurements demonstrate that both the local and long-range hole mobility are improved by F4 TCNQ doping of the nanocrystal arrays. The improved hole mobility in photoexcited p-type arrays leads to a pronounced enhancement in phototransistors.
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Affiliation(s)
| | - Ji Hao
- National Renewable Energy Laboratory, Golden, CO, 80401, USA
| | - Hyun Suk Kang
- National Renewable Energy Laboratory, Golden, CO, 80401, USA
| | - Elisa M Miller
- National Renewable Energy Laboratory, Golden, CO, 80401, USA
| | | | - Qian Zhao
- National Renewable Energy Laboratory, Golden, CO, 80401, USA
- College of Chemistry, Nankai University, Tianjin, 300071, China
| | | | - Peter C Sercel
- Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Joseph M Luther
- National Renewable Energy Laboratory, Golden, CO, 80401, USA
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33
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Harbers R, Heepenstrick T, Perepichka DF, Sokolowski M. Pure and mixed ordered monolayers of tetracyano-2,6-naphthoquinodimethane and hexathiapentacene on the Ag(100) surface. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2019; 10:1188-1199. [PMID: 31293856 PMCID: PMC6604726 DOI: 10.3762/bjnano.10.118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Accepted: 05/16/2019] [Indexed: 06/09/2023]
Abstract
We report on mixed ordered monolayers of the electron acceptor-type molecule tetracyano-2,6-naphthoquinodimethane (TNAP) and the electron donor-type molecule hexathiapentacene (HTPEN). This investigation was motivated by the general question which type of mixed stoichiometric structures are formed on a surface by molecules that are otherwise typically used for the synthesis of bulk charge-transfer materials. The layers were obtained by vacuum deposition on the Ag(100) surface and analyzed by low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM). The formation of the mixed structure occurs spontaneously. An important motif for the structure formation is given by hydrogen bonds between the TNAP molecules. Both molecules, TNAP and HTPEN also form well-ordered monolayers on the Ag(100) surface on their own. In all structures, the molecules are adsorbed in a planar orientation on the surface. We discuss the influence of intermolecular charge transfer on the ordering in the mixed structure.
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Affiliation(s)
- Robert Harbers
- Institut für Physikalische und Theoretische Chemie, Universität Bonn, Wegelerstraße 12, 53115 Bonn, Germany
| | - Timo Heepenstrick
- Institut für Physikalische und Theoretische Chemie, Universität Bonn, Wegelerstraße 12, 53115 Bonn, Germany
| | - Dmitrii F Perepichka
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, H3A 0B8, Quebec, Canada
| | - Moritz Sokolowski
- Institut für Physikalische und Theoretische Chemie, Universität Bonn, Wegelerstraße 12, 53115 Bonn, Germany
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34
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Schmidt N, Li J, Gottardi S, Moreno‐Lopez JC, Enache M, Monjas L, van der Vlag R, Havenith RWA, Hirsch AKH, Stöhr M. Comparing the Self-Assembly of Sexiphenyl-Dicarbonitrile on Graphite and Graphene on Cu(111). Chemistry 2019; 25:5065-5070. [PMID: 30657213 PMCID: PMC6519158 DOI: 10.1002/chem.201806312] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Indexed: 12/04/2022]
Abstract
A comparative study on the self-assembly of sexiphenyl-dicarbonitrile on highly oriented pyrolytic graphite and single-layer graphene on Cu(111) is presented. Despite an overall low molecule-substrate interaction, the close-packed structures exhibit a peculiar shift repeating every four to five molecules. This shift has hitherto not been reported for similar systems and is hence a unique feature induced by the graphitic substrates.
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Affiliation(s)
- Nico Schmidt
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747AGGroningenThe Netherlands
| | - Jun Li
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747AGGroningenThe Netherlands
| | - Stefano Gottardi
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747AGGroningenThe Netherlands
| | - Juan Carlos Moreno‐Lopez
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747AGGroningenThe Netherlands
- Current affiliation: Faculty of PhysicsUniversity of ViennaStrudlhofgasse 41090ViennaAustria
| | - Mihaela Enache
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747AGGroningenThe Netherlands
| | - Leticia Monjas
- Stratingh Institute for ChemistryUniversity of GroningenNijenborgh 79747AGGroningenThe Netherlands
| | - Ramon van der Vlag
- Stratingh Institute for ChemistryUniversity of GroningenNijenborgh 79747AGGroningenThe Netherlands
| | - Remco W. A. Havenith
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747AGGroningenThe Netherlands
- Stratingh Institute for ChemistryUniversity of GroningenNijenborgh 79747AGGroningenThe Netherlands
- Ghent Quantum Chemistry GroupDepartment of Inorganic and Physical ChemistryGhent UniversityKrijgslaan 281 (S3)9000GhentBelgium
| | - Anna K. H. Hirsch
- Stratingh Institute for ChemistryUniversity of GroningenNijenborgh 79747AGGroningenThe Netherlands
- Department of Drug Design and Optimization (DDOP)Helmholtz Institute for Pharmaceutical Research Saarland66123SaarbrückenGermany
- Department of PharmacySaarland UniversityCampus Building E8.166123SaarbrückenGermany
| | - Meike Stöhr
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747AGGroningenThe Netherlands
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35
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An Overview of Molecular Packing Mode in Two‐Dimensional Organic Nanomaterials via Supramolecular Assembly. CHINESE J CHEM 2019. [DOI: 10.1002/cjoc.201800566] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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36
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Zu X, Li J, Qian Y, Duan W, Zeng Q. Progress in self-assembly of TTF derivatives at HOPG interface. NEW J CHEM 2019. [DOI: 10.1039/c8nj05341c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Self-assembled structures of TTF derivatives can be observed according to different substituents.
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Affiliation(s)
- Xiaoyi Zu
- Department of Chemistry
- School of Science
- Beijing Jiaotong University
- Beijing 100044
- China
| | - Jianqiao Li
- Department of Chemistry
- School of Science
- Beijing Jiaotong University
- Beijing 100044
- China
| | - Yuxin Qian
- Department of Chemistry
- School of Science
- Beijing Jiaotong University
- Beijing 100044
- China
| | - Wubiao Duan
- Department of Chemistry
- School of Science
- Beijing Jiaotong University
- Beijing 100044
- China
| | - Qingdao Zeng
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology
- CAS Center for Excellence in Nanoscience
- National Center for Nanoscience and Technology (NCNST)
- Beijing 100190
- China
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37
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Schwarz M, Duncan DA, Garnica M, Ducke J, Deimel PS, Thakur PK, Lee TL, Allegretti F, Auwärter W. Quantitative determination of a model organic/insulator/metal interface structure. NANOSCALE 2018; 10:21971-21977. [PMID: 30444513 PMCID: PMC6289171 DOI: 10.1039/c8nr06387g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 09/28/2018] [Indexed: 05/22/2023]
Abstract
By combining X-ray photoelectron spectroscopy, X-ray standing waves and scanning tunneling microscopy, we investigate the geometric and electronic structure of a prototypical organic/insulator/metal interface, namely cobalt porphine on monolayer hexagonal boron nitride (h-BN) on Cu(111). Specifically, we determine the adsorption height of the organic molecule and show that the original planar molecular conformation is preserved in contrast to the adsorption on Cu(111). In addition, we highlight the electronic decoupling provided by the h-BN spacer layer and find that the h-BN-metal separation is not significantly modified by the molecular adsorption. Finally, we find indication of a temperature dependence of the adsorption height, which might be a signature of strongly-anisotropic thermal vibrations of the weakly bonded molecules.
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Affiliation(s)
- Martin Schwarz
- Physics Department
, Technical University of Munich
,
85748 Garching
, Germany
.
;
| | - David A. Duncan
- Diamond Light Source
, Harwell Science and Innovation Campus
,
Didcot OX11 0DE
, UK
| | - Manuela Garnica
- Physics Department
, Technical University of Munich
,
85748 Garching
, Germany
.
;
| | - Jacob Ducke
- Physics Department
, Technical University of Munich
,
85748 Garching
, Germany
.
;
| | - Peter S. Deimel
- Physics Department
, Technical University of Munich
,
85748 Garching
, Germany
.
;
| | - Pardeep K. Thakur
- Diamond Light Source
, Harwell Science and Innovation Campus
,
Didcot OX11 0DE
, UK
| | - Tien-Lin Lee
- Diamond Light Source
, Harwell Science and Innovation Campus
,
Didcot OX11 0DE
, UK
| | - Francesco Allegretti
- Physics Department
, Technical University of Munich
,
85748 Garching
, Germany
.
;
| | - Willi Auwärter
- Physics Department
, Technical University of Munich
,
85748 Garching
, Germany
.
;
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38
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Kumar A, Banerjee K, Foster AS, Liljeroth P. Two-Dimensional Band Structure in Honeycomb Metal-Organic Frameworks. NANO LETTERS 2018; 18:5596-5602. [PMID: 30134111 PMCID: PMC6179349 DOI: 10.1021/acs.nanolett.8b02062] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 08/08/2018] [Indexed: 05/31/2023]
Abstract
Two-dimensional (2D) metal-organic frameworks (MOFs) have been recently proposed as a flexible material platform for realizing exotic quantum phases including topological and anomalous quantum Hall insulators. Experimentally, direct synthesis of 2D MOFs has been essentially confined to metal substrates, where the strong interaction with the substrate masks the intrinsic electronic properties of the MOF. In addition to electronic decoupling from the underlying metal support, synthesis on weakly interacting substrates (e.g., graphene) would enable direct realization of heterostructures of 2D MOFs with inorganic 2D materials. Here, we demonstrate synthesis of 2D honeycomb MOFs on epitaxial graphene substrate. Using low-temperature scanning tunneling microscopy (STM) and atomic force microscopy (AFM) complemented by density-functional theory (DFT) calculations, we show the formation of a 2D band structure in the MOF decoupled from the substrate. These results open the experimental path toward MOF-based designer electronic materials with complex, engineered electronic structures.
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Affiliation(s)
- Avijit Kumar
- Department
of Applied Physics, Aalto University School
of Science, PO Box 15100, 00076 Aalto, Finland
| | - Kaustuv Banerjee
- Department
of Applied Physics, Aalto University School
of Science, PO Box 15100, 00076 Aalto, Finland
| | - Adam S. Foster
- Department
of Applied Physics, Aalto University School
of Science, P.O. Box 11100, 00076 Aalto, Finland
- WPI
Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
- Graduate
School Materials Science in Mainz, Staudinger Weg 9, 55128 Mainz, Germany
| | - Peter Liljeroth
- Department
of Applied Physics, Aalto University School
of Science, PO Box 15100, 00076 Aalto, Finland
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39
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Bertolazzi S, Gobbi M, Zhao Y, Backes C, Samorì P. Molecular chemistry approaches for tuning the properties of two-dimensional transition metal dichalcogenides. Chem Soc Rev 2018; 47:6845-6888. [PMID: 30043037 DOI: 10.1039/c8cs00169c] [Citation(s) in RCA: 131] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Two-dimensional (2D) semiconductors, such as ultrathin layers of transition metal dichalcogenides (TMDs), offer a unique combination of electronic, optical and mechanical properties, and hold potential to enable a host of new device applications spanning from flexible/wearable (opto)electronics to energy-harvesting and sensing technologies. A critical requirement for developing practical and reliable electronic devices based on semiconducting TMDs consists in achieving a full control over their charge-carrier polarity and doping. Inconveniently, such a challenging task cannot be accomplished by means of well-established doping techniques (e.g. ion implantation and diffusion), which unavoidably damage the 2D crystals resulting in degraded device performances. Nowadays, a number of alternatives are being investigated, including various (supra)molecular chemistry approaches relying on the combination of 2D semiconductors with electroactive donor/acceptor molecules. As yet, a large variety of molecular systems have been utilized for functionalizing 2D TMDs via both covalent and non-covalent interactions. Such research endeavours enabled not only the tuning of the charge-carrier doping but also the engineering of the optical, electronic, magnetic, thermal and sensing properties of semiconducting TMDs for specific device applications. Here, we will review the most enlightening recent advancements in experimental (supra)molecular chemistry methods for tailoring the properties of atomically-thin TMDs - in the form of substrate-supported or solution-dispersed nanosheets - and we will discuss the opportunities and the challenges towards the realization of novel hybrid materials and devices based on 2D semiconductors and molecular systems.
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Affiliation(s)
- Simone Bertolazzi
- Université de Strasbourg, CNRS, ISIS, 8 alleé Gaspard Monge, 67000 Strasbourg, France.
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40
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Schiffrin A, Capsoni M, Farahi G, Wang CG, Krull C, Castelli M, Roussy T, Cochrane KA, Yin Y, Medhekar NV, Fuhrer M, Shaw AQ, Ji W, Burke SA. Designing Optoelectronic Properties by On-Surface Synthesis: Formation and Electronic Structure of an Iron-Terpyridine Macromolecular Complex. ACS NANO 2018; 12:6545-6553. [PMID: 29911862 DOI: 10.1021/acsnano.8b01026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Supramolecular chemistry protocols applied on surfaces offer compelling avenues for atomic-scale control over organic-inorganic interface structures. In this approach, adsorbate-surface interactions and two-dimensional confinement can lead to morphologies and properties that differ dramatically from those achieved via conventional synthetic approaches. Here, we describe the bottom-up, on-surface synthesis of one-dimensional coordination nanostructures based on an iron (Fe)-terpyridine (tpy) interaction borrowed from functional metal-organic complexes used in photovoltaic and catalytic applications. Thermally activated diffusion of sequentially deposited ligands and metal atoms and intraligand conformational changes lead to Fe-tpy coordination and formation of these nanochains. We used low-temperature scanning tunneling microscopy and density functional theory to elucidate the atomic-scale morphology of the system, suggesting a linear tri-Fe linkage between facing, coplanar tpy groups. Scanning tunneling spectroscopy reveals the highest occupied orbitals, with dominant contributions from states located at the Fe node, and ligand states that mostly contribute to the lowest unoccupied orbitals. This electronic structure yields potential for hosting photoinduced metal-to-ligand charge transfer in the visible/near-infrared. The formation of this unusual tpy/tri-Fe/tpy coordination motif has not been observed for wet chemistry synthetic methods and is mediated by the bottom-up on-surface approach used here, offering pathways to engineer the optoelectronic properties and reactivity of metal-organic nanostructures.
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Affiliation(s)
- Agustin Schiffrin
- Department of Physics and Astronomy , University of British Columbia , Vancouver , British Columbia , Canada , V6T 1Z1
- School of Physics & Astronomy , Monash University , Clayton , Victoria 3800 , Australia
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies , Monash University , Clayton , Victoria 3800 , Australia
| | - Martina Capsoni
- Department of Physics and Astronomy , University of British Columbia , Vancouver , British Columbia , Canada , V6T 1Z1
| | - Gelareh Farahi
- Department of Physics and Astronomy , University of British Columbia , Vancouver , British Columbia , Canada , V6T 1Z1
| | - Chen-Guang Wang
- Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices , Renmin University of China , Beijing 100872 , People's Republic of China
| | - Cornelius Krull
- School of Physics & Astronomy , Monash University , Clayton , Victoria 3800 , Australia
| | - Marina Castelli
- School of Physics & Astronomy , Monash University , Clayton , Victoria 3800 , Australia
| | - Tanya Roussy
- Department of Physics and Astronomy , University of British Columbia , Vancouver , British Columbia , Canada , V6T 1Z1
| | - Katherine A Cochrane
- Department of Chemistry , University of British Columbia , Vancouver , British Columbia , Canada , V6T 1Z1
| | - Yuefeng Yin
- School of Physics & Astronomy , Monash University , Clayton , Victoria 3800 , Australia
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies , Monash University , Clayton , Victoria 3800 , Australia
- Department of Materials Science and Engineering , Monash University , Clayton , Victoria 3800 , Australia
| | - Nikhil V Medhekar
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies , Monash University , Clayton , Victoria 3800 , Australia
- Department of Materials Science and Engineering , Monash University , Clayton , Victoria 3800 , Australia
| | - Michael Fuhrer
- School of Physics & Astronomy , Monash University , Clayton , Victoria 3800 , Australia
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies , Monash University , Clayton , Victoria 3800 , Australia
| | - Adam Q Shaw
- Department of Physics and Astronomy , University of British Columbia , Vancouver , British Columbia , Canada , V6T 1Z1
| | - Wei Ji
- Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices , Renmin University of China , Beijing 100872 , People's Republic of China
| | - Sarah A Burke
- Department of Physics and Astronomy , University of British Columbia , Vancouver , British Columbia , Canada , V6T 1Z1
- Quantum Matter Institute , University of British Columbia , Vancouver , British Columbia , Canada , V6T 1Z4
- Department of Chemistry , University of British Columbia , Vancouver , British Columbia , Canada , V6T 1Z1
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41
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Kalashnyk N, Amiaud L, Dablemont C, Lafosse A, Bobrov K, Guillemot L. Strain relaxation and epitaxial relationship of perylene overlayer on Ag(110). J Chem Phys 2018; 148:214702. [DOI: 10.1063/1.5027724] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Nataliya Kalashnyk
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Saclay, F-91405 Orsay, France
| | - Lionel Amiaud
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Saclay, F-91405 Orsay, France
| | - Céline Dablemont
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Saclay, F-91405 Orsay, France
| | - Anne Lafosse
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Saclay, F-91405 Orsay, France
| | - Kirill Bobrov
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Saclay, F-91405 Orsay, France
| | - Laurent Guillemot
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Saclay, F-91405 Orsay, France
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42
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Huang YL, Zheng YJ, Song Z, Chi D, Wee ATS, Quek SY. The organic-2D transition metal dichalcogenide heterointerface. Chem Soc Rev 2018; 47:3241-3264. [PMID: 29651487 DOI: 10.1039/c8cs00159f] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Since the first isolation of graphene, new classes of two-dimensional (2D) materials have offered fascinating platforms for fundamental science and technology explorations at the nanometer scale. In particular, 2D transition metal dichalcogenides (TMD) such as MoS2 and WSe2 have been intensely investigated due to their unique electronic and optical properties, including tunable optical bandgaps, direct-indirect bandgap crossover, strong spin-orbit coupling, etc., for next-generation flexible nanoelectronics and nanophotonics applications. On the other hand, organics have always been excellent materials for flexible electronics. A plethora of organic molecules, including donors, acceptors, and photosensitive molecules, can be synthesized using low cost and scalable procedures. Marrying the fields of organics and 2D TMDs will bring benefits that are not present in either material alone, enabling even better, multifunctional flexible devices. Central to the realization of such devices is a fundamental understanding of the organic-2D TMD interface. Here, we review the organic-2D TMD interface from both chemical and physical perspectives. We discuss the current understanding of the interfacial interactions between the organic layers and the TMDs, as well as the energy level alignment at the interface, focusing in particular on surface charge transfer and electronic screening effects. Applications from the literature are discussed, especially in optoelectronics and p-n hetero- and homo-junctions. We conclude with an outlook on future scientific and device developments based on organic-2D TMD heterointerfaces.
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Affiliation(s)
- Yu Li Huang
- Institute of Materials Research & Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore.
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43
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Bang JJ, Porter AG, Davis TC, Hayes TR, Claridge SA. Spatially Controlled Noncovalent Functionalization of 2D Materials Based on Molecular Architecture. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:5454-5463. [PMID: 29708753 DOI: 10.1021/acs.langmuir.8b00553] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Polymerizable amphiphiles can be assembled into lying-down phases on 2D materials such as graphite and graphene to create chemically orthogonal surface patterns at 5-10 nm scales, locally modulating functionality of the 2D basal plane. Functionalization can be carried out through Langmuir-Schaefer conversion, in which a subset of molecules is transferred out of a standing phase film on water onto the 2D substrate. Here, we leverage differences in molecular structure to spatially control transfer at both nanoscopic and microscopic scales. We compare transfer properties of five different single- and dual-chain amphiphiles, demonstrating that those with strong lateral interactions (e.g., hydrogen-bonding networks) exhibit the lowest transfer efficiencies. Since molecular structures also influence microscopic domain morphologies in Langmuir films, we show that it is possible to transfer such microscale patterns, taking advantage of variations in the local transfer rates based on the structural heterogeneity in Langmuir films. Nanoscale domain morphologies also vary in ways that are consistent with predicted relative transfer and diffusion rates. These results suggest strategies to tailor noncovalent functionalization of 2D substrates through controlled LS transfer.
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44
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Cui X, Troadec C, Wee ATS, Huang YL. Surface Nanostructure Formation and Atomic-Scale Templates for Nanodevices. ACS OMEGA 2018; 3:3285-3293. [PMID: 31458585 PMCID: PMC6641249 DOI: 10.1021/acsomega.8b00014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 02/09/2018] [Indexed: 05/20/2023]
Abstract
The holy grail in nanoelectronics is the construction of nanodevices with high density, low cost, and high performance per device and per integrated circuit. One approach is the fabrication of surface nanostructures and atomic-scale templates via the autonomous assembly of atoms and/or molecules on well-defined surfaces. To steer the atomic or molecular growth processes and create a wide range of surface nanostructures with desired properties, a comprehensive understanding of the mechanisms that control the surface self-assembly processes is required. The capability to manipulate the nanodevices at the submolecular level with good controllability is also of paramount importance. This review highlights some key recent developments in the fabrication of low-dimensional nanostructures based on supramolecular self-assembly on predefined surfaces, with particular emphasis on the rapidly expanding field of two-dimensional materials. Special attention is also given to the latest progress in single-molecule manipulation for future device applications.
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Affiliation(s)
- Xiaoyang Cui
- Institute
of Materials Research & Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore
- Department
of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
| | - Cedric Troadec
- Institute
of Materials Research & Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore
| | - Andrew T. S. Wee
- Institute
of Materials Research & Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore
- Department
of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
- E-mail: (A.T.S.W.)
| | - Yu Li Huang
- Institute
of Materials Research & Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore
- Department
of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
- E-mail: (Y.L.H.)
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45
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Germanium-doped Metallic Ohmic Contacts in Black Phosphorus Field-Effect Transistors with Ultra-low Contact Resistance. Sci Rep 2017; 7:16857. [PMID: 29203831 PMCID: PMC5714961 DOI: 10.1038/s41598-017-16845-w] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 11/17/2017] [Indexed: 11/18/2022] Open
Abstract
In this work, we demonstrate for the first time an ultra-low contact resistance few-layered black phosphorus (BP) transistor with metallic PGex contacts formed by rapid thermal annealing (RTA). The on-state current of the transistor can be significantly improved and the ION/IOFF ratio increases by almost 2 order. The hole mobility is enhanced by 25 times to 227 cm2V−1s−1. The contact resistance extracted by the transfer length method is 0.365 kΩ∙μm, which is the lowest value in black phosphorus transistors without degradation of ION/IOFF ratio. In addition, the I-V curve of the transistor with PGex contact is linear compared to that with Ti contact at 80 K, indicating that a metallic ohmic contact is successfully formed. Finally, X-ray photoelectron spectroscopy is used to characterize the PGex compound. A signal of P-Ge bond is first observed, further verifying the doping of Ge into BP and the formation of the PGex alloy.
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46
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Schwarz M, Riss A, Garnica M, Ducke J, Deimel PS, Duncan DA, Thakur PK, Lee TL, Seitsonen AP, Barth JV, Allegretti F, Auwärter W. Corrugation in the Weakly Interacting Hexagonal-BN/Cu(111) System: Structure Determination by Combining Noncontact Atomic Force Microscopy and X-ray Standing Waves. ACS NANO 2017; 11:9151-9161. [PMID: 28872822 DOI: 10.1021/acsnano.7b04022] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Atomically thin hexagonal boron nitride (h-BN) layers on metallic supports represent a promising platform for the selective adsorption of atoms, clusters, and molecular nanostructures. Specifically, scanning tunneling microscopy (STM) studies revealed an electronic corrugation of h-BN/Cu(111), guiding the self-assembly of molecules and their energy level alignment. A detailed characterization of the h-BN/Cu(111) interface including the spacing between the h-BN sheet and its support-elusive to STM measurements-is crucial to rationalize the interfacial interactions within these systems. To this end, we employ complementary techniques including high-resolution noncontact atomic force microscopy, STM, low-energy electron diffraction, X-ray photoelectron spectroscopy, the X-ray standing wave method, and density functional theory. Our multimethod study yields a comprehensive, quantitative structure determination including the adsorption height and the corrugation of the sp2 bonded h-BN layer on Cu(111). Based on the atomic contrast in atomic force microscopy measurements, we derive a measurable-hitherto unrecognized-geometric corrugation of the h-BN monolayer. This experimental approach allows us to spatially resolve minute height variations in low-dimensional nanostructures, thus providing a benchmark for theoretical modeling. Regarding potential applications, e.g., as a template or catalytically active support, the recognition of h-BN on Cu(111) as a weakly bonded and moderately corrugated overlayer is highly relevant.
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Affiliation(s)
- Martin Schwarz
- Technical University of Munich , Department of Physics, 85748 Garching, Germany
| | - Alexander Riss
- Technical University of Munich , Department of Physics, 85748 Garching, Germany
| | - Manuela Garnica
- Technical University of Munich , Department of Physics, 85748 Garching, Germany
| | - Jacob Ducke
- Technical University of Munich , Department of Physics, 85748 Garching, Germany
| | - Peter S Deimel
- Technical University of Munich , Department of Physics, 85748 Garching, Germany
| | - David A Duncan
- Diamond Light Source , Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom
| | - Pardeep Kumar Thakur
- Diamond Light Source , Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom
| | - Tien-Lin Lee
- Diamond Light Source , Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom
| | - Ari Paavo Seitsonen
- Département de Chimie, École Normale Supérieure , 24 rue Lhomond, F-75005 Paris, France
| | - Johannes V Barth
- Technical University of Munich , Department of Physics, 85748 Garching, Germany
| | | | - Willi Auwärter
- Technical University of Munich , Department of Physics, 85748 Garching, Germany
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47
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Tian T, Shih CJ. Molecular Epitaxy on Two-Dimensional Materials: The Interplay between Interactions. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b02669] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tian Tian
- Institute for Chemical and
Bioengineering, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
| | - Chih-Jen Shih
- Institute for Chemical and
Bioengineering, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
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48
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Saikia N, Waters K, Karna SP, Pandey R. Hierarchical Self-Assembly of Noncanonical Guanine Nucleobases on Graphene. ACS OMEGA 2017; 2:3457-3466. [PMID: 31457668 PMCID: PMC6641521 DOI: 10.1021/acsomega.7b00528] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 06/27/2017] [Indexed: 06/08/2023]
Abstract
Self-assembly characterizes the fundamental basis toward realizing the formation of highly ordered hierarchical heterostructures. A systematic approach toward the supramolecular self-assembly of free-standing guanine nucleobases and the role of graphene as a substrate in directing the monolayer assembly are investigated using the molecular dynamics simulation. We find that the free-standing bases in gas phase aggregate into clusters dominated by intermolecular H-bonds, whereas in solvent, substantial screening of intermolecular interactions results in π-stacked configurations. Interestingly, graphene facilitates the monolayer assembly of the bases mediated through the base-substrate π-π stacking. The bases assemble in a highly compact network in gas phase, whereas in solvent, a high degree of immobilization is attributed to the disruption of intermolecular interactions. Graphene-induced stabilization/aggregation of free-standing guanine bases appears as one of the prerequisites governing molecular ordering and assembly at the solid/liquid interface. The results demonstrate an interplay between intermolecular and π-stacking interactions, central to the molecular recognition, aggregation dynamics, and patterned growth of functional molecules on two-dimensional nanomaterials.
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Affiliation(s)
- Nabanita Saikia
- Department
of Physics, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931, United States
| | - Kevin Waters
- Department
of Physics, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931, United States
| | - Shashi P. Karna
- Weapons
and Materials Research Directorate, U.S.
Army Research Laboratory, ATTN: RDRL-WM, Aberdeen Proving Ground, Aberdeen, Maryland 21005-5069, United States
| | - Ravindra Pandey
- Department
of Physics, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931, United States
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49
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Kumar A, Banerjee K, Dvorak M, Schulz F, Harju A, Rinke P, Liljeroth P. Charge-Transfer-Driven Nonplanar Adsorption of F 4TCNQ Molecules on Epitaxial Graphene. ACS NANO 2017; 11:4960-4968. [PMID: 28467831 DOI: 10.1021/acsnano.7b01599] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
π-conjugated organic molecules tend to adsorb in a planar configuration on graphene irrespective of their charge state. In contrast, here we demonstrate charging-induced strong structural relaxation of tetrafluorotetracyanoquinodimethane (F4TCNQ) on epitaxial graphene on Ir(111) (G/Ir(111)). The work function modulation over the graphene moiré unit cell causes site-selective charging of F4TCNQ. Upon charging, the molecule anchors to the face-centered cubic sites of the G/Ir(111) moiré through one or two cyano groups. The reaction is reversible and can be triggered on a single molecule by moving it between different adsorption sites. We introduce a model taking into account the trade-off between tilt-induced charging and reduced van der Waals interactions, which provides a general framework for understanding charging-induced structural relaxation on weakly interacting substrates. In addition, we argue that the partial sp3 rehybridization of the underlying graphene and the possible bonding mechanism between the cyano groups and the graphene substrate are also relevant for the complete understanding of the experiments. These results provide insight into molecular charging on graphene, and they are directly relevant for potential device applications where the use of molecules has been suggested for doping and band structure engineering.
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Affiliation(s)
- Avijit Kumar
- Department of Applied Physics and ‡COMP/Department of Applied Physics, Aalto University School of Science , 00076 Aalto, Finland
| | - Kaustuv Banerjee
- Department of Applied Physics and ‡COMP/Department of Applied Physics, Aalto University School of Science , 00076 Aalto, Finland
| | - Marc Dvorak
- Department of Applied Physics and ‡COMP/Department of Applied Physics, Aalto University School of Science , 00076 Aalto, Finland
| | - Fabian Schulz
- Department of Applied Physics and ‡COMP/Department of Applied Physics, Aalto University School of Science , 00076 Aalto, Finland
| | - Ari Harju
- Department of Applied Physics and ‡COMP/Department of Applied Physics, Aalto University School of Science , 00076 Aalto, Finland
| | - Patrick Rinke
- Department of Applied Physics and ‡COMP/Department of Applied Physics, Aalto University School of Science , 00076 Aalto, Finland
| | - Peter Liljeroth
- Department of Applied Physics and ‡COMP/Department of Applied Physics, Aalto University School of Science , 00076 Aalto, Finland
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50
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Mali KS, Pearce N, De Feyter S, Champness NR. Frontiers of supramolecular chemistry at solid surfaces. Chem Soc Rev 2017; 46:2520-2542. [DOI: 10.1039/c7cs00113d] [Citation(s) in RCA: 168] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Supramolecular chemistry on solid surfaces represents an exciting field of research that continues to develop in new and unexpected directions.
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Affiliation(s)
- Kunal S. Mali
- Division of Molecular Imaging and Photonics
- Department of Chemistry
- KU Leuven – University of Leuven
- B3001 Leuven
- Belgium
| | | | - Steven De Feyter
- Division of Molecular Imaging and Photonics
- Department of Chemistry
- KU Leuven – University of Leuven
- B3001 Leuven
- Belgium
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