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Wang H, Randeniya M, Houston A, Duscher G, Gu G. Ultraclean Suspended Graphene by Radiolysis of Adsorbed Water. NANO LETTERS 2024; 24:8866-8871. [PMID: 38976330 DOI: 10.1021/acs.nanolett.4c01440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/10/2024]
Abstract
Access to intrinsic properties of a 2D material is challenging due to the absence of a bulk that would dominate over surface contamination, and this lack of bulk also precludes effective conventional cleaning methods that are almost always sacrificial. Suspended graphene and carbon contaminants represent the most salient challenge. This work has achieved ultraclean graphene, attested by electron energy loss (EEL) spectra unprecedentedly exhibiting fine-structure features expected from bonding and band structure. In the cleaning process in a transmission electron microscope, radicals generated by radiolysis of intentionally adsorbed water remove organic contaminants, which would otherwise be feedstock of the notorious electron irradiation induced carbon deposition. This method can be readily adapted to other experimental settings and other materials to enable previously inhibited undertakings that rely on the intrinsic properties or ultimate thinness of 2D materials. Importantly, the method is surprisingly simple and robust, easily implementable with common lab equipment.
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Affiliation(s)
- Hao Wang
- Min H. Kao Department of Electrical Engineering and Computer Science, The University of Tennessee, Knoxville, Tennessee 37916, United States
| | - Milinda Randeniya
- Department of Physics & Astronomy, The University of Tennessee, Knoxville, Tennessee 37916, United States
| | - Austin Houston
- Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37916, United States
| | - Gerd Duscher
- Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37916, United States
| | - Gong Gu
- Min H. Kao Department of Electrical Engineering and Computer Science, The University of Tennessee, Knoxville, Tennessee 37916, United States
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2
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Cheon S, Cho WJ, Yi GR, Kang B, Oh SS. Ultrafast and Reversible Superwettability Switching of 3D Graphene Foams via Solvent-Exclusive Plasma Treatments. ACS NANO 2024. [PMID: 39033415 DOI: 10.1021/acsnano.4c03102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/23/2024]
Abstract
For highly active electron transfer and ion diffusion, controlling the surface wettability of electrically and thermally conductive 3D graphene foams (3D GFs) is required. Here, we present ultrasimple and rapid superwettability switching of 3D GFs in a reversible and reproducible manner, mediated by solvent-exclusive microwave arcs. As the 3D GFs are prepared with vapors of nonpolar acetone or polar water exclusively, short microwave radiation (≤10 s) leads to plasma hotspot-mediated production of methyl and hydroxyl radicals, respectively. Upon immediate radical chemisorption, the 3D surfaces become either superhydrophobic (water contact angle = ∼170°) or superhydrophilic (∼0°), and interestingly, the wettability transition can be repeated many times due to the facile exchange between previously chemisorbed and newly introduced radicals via the formation of methanol-like intermediates. When 3D GFs of different surficial polarities are incorporated into electric double-layer capacitors with nonpolar ionic liquids or polar aqueous electrolytes, the polarity matching between graphene surfaces and electrolytes results in ≥548.0 times higher capacitance compared to its mismatching at ≥0.5 A g-1, demonstrating the significance of wettability-controlled 3D GFs.
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Affiliation(s)
- Soomin Cheon
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, South Korea
| | - Won-Jang Cho
- Department of Chemical Engineering, POSTECH, Pohang 37673, South Korea
| | - Gi-Ra Yi
- Department of Chemical Engineering, POSTECH, Pohang 37673, South Korea
| | - Byoungwoo Kang
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, South Korea
| | - Seung Soo Oh
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, South Korea
- Department of Chemical Engineering, POSTECH, Pohang 37673, South Korea
- Institute for Convergence Research and Education in Advanced Technology (I-CREATE), Yonsei University, Incheon 21983, South Korea
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3
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Yang F, Thompson AG, McQuain AD, Gundurao D, Stando G, Kim MA, Liu H, Li L. Wetting Transparency of Single-Layer Graphene on Liquid Substrates. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2403820. [PMID: 38720475 DOI: 10.1002/adma.202403820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Revised: 05/06/2024] [Indexed: 05/15/2024]
Abstract
Graphene's wetting transparency offers promising avenues for creating multifunctional devices by allowing real-time wettability control on liquid substrates via the flow of different liquids beneath graphene. Despite its potential, direct measurement of floating graphene's wettability remains a challenge, hindering the exploration of these applications. The current study develops an experimental methodology to assess the wetting transparency of single-layer graphene (SLG) on liquid substrates. By employing contact angle measurements and Neumann's Triangle model, the challenge of evaluating the wettability of floating free-suspended single-layer graphene is addressed. The research reveals that for successful contact angle measurements, the testing and substrate liquids must be immiscible. Using diiodomethane as the testing liquid and ammonium persulfate solution as liquid substrate, the study demonstrates the near-complete wetting transparency of graphene. Furthermore, it successfully showcases the feasibility of real-time wettability control using graphene on liquid substrates. This work not only advances the understanding of graphene's interaction with liquid interfaces but also suggests a new avenue for the development of multifunctional materials and devices by exploiting the unique wetting transparency of graphene.
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Affiliation(s)
- Fan Yang
- Department of Chemical & Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania, 15261, USA
| | - Annette G Thompson
- Department of Chemical & Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania, 15261, USA
| | - Alex D McQuain
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania, 15260, USA
| | - Dhruthi Gundurao
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania, 15260, USA
| | - Grzegorz Stando
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania, 15260, USA
| | - Min A Kim
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania, 15260, USA
| | - Haitao Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania, 15260, USA
| | - Lei Li
- Department of Chemical & Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania, 15261, USA
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4
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Zhang N, Zhang K, Zou M, Maniyara RA, Bowen TA, Schrecengost JR, Jain A, Zhou D, Dong C, Yu Z, Liu H, Giebink NC, Robinson JA, Hu W, Huang S, Terrones M. Tuning the Fermi Level of Graphene by Two-Dimensional Metals for Raman Detection of Molecules. ACS NANO 2024; 18:8876-8884. [PMID: 38497598 DOI: 10.1021/acsnano.3c12152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
Graphene-enhanced Raman scattering (GERS) offers great opportunities to achieve optical sensing with a high uniformity and superior molecular selectivity. The GERS mechanism relies on charge transfer between molecules and graphene, which is difficult to manipulate by varying the band alignment between graphene and the molecules. In this work, we synthesized a few atomic layers of metal termed two-dimensional (2D) metal to precisely and deterministically modify the graphene Fermi level. Using copper phthalocyanine (CuPc) as a representative molecule, we demonstrated that tuning the Fermi level can significantly improve the signal enhancement and molecular selectivity of GERS. Specifically, aligning the Fermi level of graphene closer to the highest occupied molecular orbital (HOMO) of CuPc results in a more pronounced Raman enhancement. Density functional theory (DFT) calculations of the charge density distribution reproduce the enhanced charge transfer between CuPc molecules and graphene with a modulated Fermi level. Extending our investigation to other molecules such as rhodamine 6G, rhodamine B, crystal violet, and F16CuPc, we showed that 2D metals enabled Fermi level tuning, thus improving GERS detection for molecules and contributing to an enhanced molecular selectivity. This underscores the potential of utilizing 2D metals for the precise control and optimization of GERS applications, which will benefit the development of highly sensitive, specific, and reliable sensors.
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Affiliation(s)
- Na Zhang
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Kunyan Zhang
- Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, United States
| | - Min Zou
- School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong 250353, People's Republic of China
| | - Rinu Abraham Maniyara
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Timothy Andrew Bowen
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Jonathon Ray Schrecengost
- Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Arpit Jain
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Da Zhou
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Chengye Dong
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Zhuohang Yu
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - He Liu
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Noel C Giebink
- Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Joshua A Robinson
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Two-Dimensional Crystal Consortium, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Center for Two-Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Wei Hu
- School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong 250353, People's Republic of China
| | - Shengxi Huang
- Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, United States
| | - Mauricio Terrones
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Two-Dimensional Crystal Consortium, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Center for Two-Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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5
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Zhang Q, Li M, Li L, Geng D, Chen W, Hu W. Recent progress in emerging two-dimensional organic-inorganic van der Waals heterojunctions. Chem Soc Rev 2024; 53:3096-3133. [PMID: 38373059 DOI: 10.1039/d3cs00821e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2024]
Abstract
Two-dimensional (2D) materials have attracted significant attention in recent decades due to their exceptional optoelectronic properties. Among them, to meet the growing demand for multifunctional applications, 2D organic-inorganic van der Waals (vdW) heterojunctions have become increasingly popular in the development of optoelectronic devices. These heterojunctions demonstrate impressive capability to synergistically combine the favourable characteristics of organic and inorganic materials, thereby offering a wide range of advantages. Also, they enable the creation of innovative device structures and introduce novel functionalities in existing 2D materials, avoiding the need for lattice matching in different material systems. Presently, researchers are actively working on improving the performance of devices based on 2D organic-inorganic vdW heterojunctions by focusing on enhancing the quality of 2D materials, precise stacking methods, energy band regulation, and material selection. Therefore, this review presents a thorough examination of the emerging 2D organic-inorganic vdW heterojunctions, including their classification, fabrication, and corresponding devices. Additionally, this review offers profound and comprehensive insight into the challenges in this field to inspire future research directions. It is expected to propel researchers to harness the extraordinary capabilities of 2D organic-inorganic vdW heterojunctions for a wider range of applications by further advancing the understanding of their fundamental properties, expanding the range of available materials, and exploring novel device architectures. The ongoing research and development in this field hold potential to unlock captivating advancements and foster practical applications across diverse industries.
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Affiliation(s)
- Qing Zhang
- Key Laboratory of Organic Integrated Circuit, Ministry of Education & Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China.
- Department of Chemistry, National University of Singapore, Singapore 117543, Singapore.
- Beijing National Laboratory for Molecular Sciences, Beijing 100190, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Menghan Li
- Key Laboratory of Organic Integrated Circuit, Ministry of Education & Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China.
- Beijing National Laboratory for Molecular Sciences, Beijing 100190, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Lin Li
- College of Chemistry, Tianjin Normal University, Tianjin 300387, China.
- Beijing National Laboratory for Molecular Sciences, Beijing 100190, China
| | - Dechao Geng
- Key Laboratory of Organic Integrated Circuit, Ministry of Education & Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China.
- Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Fuzhou 350207, China
- Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China
- Beijing National Laboratory for Molecular Sciences, Beijing 100190, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Wei Chen
- Department of Chemistry, National University of Singapore, Singapore 117543, Singapore.
- Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Fuzhou 350207, China
| | - Wenping Hu
- Key Laboratory of Organic Integrated Circuit, Ministry of Education & Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China.
- Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Fuzhou 350207, China
- Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
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Lee GS, Kim JG, Kim JT, Lee CW, Cha S, Choi GB, Lim J, Padmajan Sasikala S, Kim SO. 2D Materials Beyond Post-AI Era: Smart Fibers, Soft Robotics, and Single Atom Catalysts. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023:e2307689. [PMID: 37777874 DOI: 10.1002/adma.202307689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 09/18/2023] [Indexed: 10/02/2023]
Abstract
Recent consecutive discoveries of various 2D materials have triggered significant scientific and technological interests owing to their exceptional material properties, originally stemming from 2D confined geometry. Ever-expanding library of 2D materials can provide ideal solutions to critical challenges facing in current technological trend of the fourth industrial revolution. Moreover, chemical modification of 2D materials to customize their physical/chemical properties can satisfy the broad spectrum of different specific requirements across diverse application areas. This review focuses on three particular emerging application areas of 2D materials: smart fibers, soft robotics, and single atom catalysts (SACs), which hold immense potentials for academic and technological advancements in the post-artificial intelligence (AI) era. Smart fibers showcase unconventional functionalities including healthcare/environmental monitoring, energy storage/harvesting, and antipathogenic protection in the forms of wearable fibers and textiles. Soft robotics aligns with future trend to overcome longstanding limitations of hard-material based mechanics by introducing soft actuators and sensors. SACs are widely useful in energy storage/conversion and environmental management, principally contributing to low carbon footprint for sustainable post-AI era. Significance and unique values of 2D materials in these emerging applications are highlighted, where the research group has devoted research efforts for more than a decade.
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Affiliation(s)
- Gang San Lee
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
- KAIST Institute for Nanocentry, KAIST, Daejeon, 34141, Republic of Korea
| | - Jin Goo Kim
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
- KAIST Institute for Nanocentry, KAIST, Daejeon, 34141, Republic of Korea
| | - Jun Tae Kim
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
- KAIST Institute for Nanocentry, KAIST, Daejeon, 34141, Republic of Korea
| | - Chan Woo Lee
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
- KAIST Institute for Nanocentry, KAIST, Daejeon, 34141, Republic of Korea
| | - Sujin Cha
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
- KAIST Institute for Nanocentry, KAIST, Daejeon, 34141, Republic of Korea
| | - Go Bong Choi
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
- KAIST Institute for Nanocentry, KAIST, Daejeon, 34141, Republic of Korea
| | - Joonwon Lim
- Department of Information Display, Kyung Hee University, Seoul, 02447, Republic of Korea
- KHU-KIST Department of Converging Science and Technology, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Suchithra Padmajan Sasikala
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
- KAIST Institute for Nanocentry, KAIST, Daejeon, 34141, Republic of Korea
| | - Sang Ouk Kim
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, Daejeon, 34141, Republic of Korea
- KAIST Institute for Nanocentry, KAIST, Daejeon, 34141, Republic of Korea
- Materials Creation, Seoul, 06179, Republic of Korea
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7
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Daher Mansour M, Oswald J, Beretta D, Stiefel M, Furrer R, Calame M, Vuillaume D. Nanoscale electronic transport at graphene/pentacene van der Waals interfaces. NANOSCALE 2023; 15:9203-9213. [PMID: 37157969 DOI: 10.1039/d2nr06682c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
We report a study on the relationship between the structure and electron transport properties of nanoscale graphene/pentacene interfaces. We fabricated graphene/pentacene interfaces from 10 to 30 nm thick needle-like pentacene nanostructures down to two-three layer (2L-3L) dendritic pentacene islands, and we measured their electron transport properties by conductive atomic force microscopy (C-AFM). The energy barrier at the interfaces, i.e., the energy position of the pentacene highest occupied molecular orbital (HOMO) with respect to the Fermi energy of graphene and the C-AFM metal tip was determined and discussed with an appropriate electron transport model (a double Schottky diode model and a Landauer-Buttiker model, respectively) taking into account the voltage-dependent charge doping of graphene. In both types of samples, the energy barrier at the graphene/pentacene interface is slightly larger than that at the pentacene/metal tip interface, resulting in 0.47-0.55 eV and 0.21-0.34 eV, respectively, for the 10-30 nm thick needle-like pentacene islands, and 0.92-1.44 eV and 0.67-1.05 eV, respectively, for the 2L-3L thick dendritic pentacene nanostructures. We attribute this difference to the molecular organization details of the pentacene/graphene heterostructures, with pentacene molecules lying flat on graphene in the needle-like pentacene nanostructures, while standing upright in the 2L-3L dendritic islands, as observed from Raman spectroscopy.
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Affiliation(s)
- Michel Daher Mansour
- Institut for Electronic, Microelectronic and Nanotechnology, Centre National de la Recherche Scientifique, Villeneuve d'Ascq, France.
| | - Jacopo Oswald
- Transport at Nanoscale Interfaces Laboratory, Swiss Federal Laboratories for Materials Science and Technology (EMPA), Dübendorf, Switzerland.
- Swiss Nanoscience Institute, University of Basel, Switzerland
| | - Davide Beretta
- Transport at Nanoscale Interfaces Laboratory, Swiss Federal Laboratories for Materials Science and Technology (EMPA), Dübendorf, Switzerland.
| | - Michael Stiefel
- Transport at Nanoscale Interfaces Laboratory, Swiss Federal Laboratories for Materials Science and Technology (EMPA), Dübendorf, Switzerland.
| | - Roman Furrer
- Transport at Nanoscale Interfaces Laboratory, Swiss Federal Laboratories for Materials Science and Technology (EMPA), Dübendorf, Switzerland.
| | - Michel Calame
- Transport at Nanoscale Interfaces Laboratory, Swiss Federal Laboratories for Materials Science and Technology (EMPA), Dübendorf, Switzerland.
- Swiss Nanoscience Institute, University of Basel, Switzerland
- Department of Physics, University of Basel, Switzerland
| | - Dominique Vuillaume
- Institut for Electronic, Microelectronic and Nanotechnology, Centre National de la Recherche Scientifique, Villeneuve d'Ascq, France.
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8
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Li S, Zhao Y, Wan H, Lin J, Min J. Molecular Understanding of the Interfacial Interaction and Corrosion Resistance between Epoxy Adhesive and Metallic Oxides on Galvanized Steel. MATERIALS (BASEL, SWITZERLAND) 2023; 16:3061. [PMID: 37109896 PMCID: PMC10141672 DOI: 10.3390/ma16083061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Revised: 03/21/2023] [Accepted: 04/10/2023] [Indexed: 06/19/2023]
Abstract
The epoxy adhesive-galvanized steel adhesive structure has been widely used in various industrial fields, but achieving high bonding strength and corrosion resistance is a challenge. This study examined the impact of surface oxides on the interfacial bonding performance of two types of galvanized steel with Zn-Al or Zn-Al-Mg coatings. Scanning electron microscopy and X-ray photoelectron spectroscopy analysis showed that the Zn-Al coating was covered by ZnO and Al2O3, while MgO was additionally found on the Zn-Al-Mg coating. Both coatings exhibited excellent adhesion in dry environments, but after 21 days of water soaking, the Zn-Al-Mg joint demonstrated better corrosion resistance than the Zn-Al joint. Numerical simulations revealed that metallic oxides of ZnO, Al2O3, and MgO had different adsorption preferences for the main components of the adhesive. The adhesion stress at the coating-adhesive interface was mainly due to hydrogen bonds and ionic interactions, and the theoretical adhesion stress of MgO adhesive system was higher than that of ZnO and Al2O3. The corrosion resistance of the Zn-Al-Mg adhesive interface was mainly due to the stronger corrosion resistance of the coating itself, and the lower water-related hydrogen bond content at the MgO adhesive interface. Understanding these bonding mechanisms can lead to the development of improved adhesive-galvanized steel structures with enhanced corrosion resistance.
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Affiliation(s)
- Shuangshuang Li
- School of Mechanical Engineering, Tongji University, Shanghai 201804, China
| | - Yanliang Zhao
- Baoshan Iron & Steel Co., Ltd., Shanghai 201900, China
| | - Hailang Wan
- School of Mechanical Engineering, Tongji University, Shanghai 201804, China
| | - Jianping Lin
- School of Mechanical Engineering, Tongji University, Shanghai 201804, China
| | - Junying Min
- School of Mechanical Engineering, Tongji University, Shanghai 201804, China
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9
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Cline C, Wang H, Kong J, Li T, Liu J, Wegst UGK. Heterogeneous Ice Nucleation Studied with Single-Layer Graphene. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:15121-15131. [PMID: 36448835 DOI: 10.1021/acs.langmuir.2c02144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Control of heterogeneous ice nucleation (HIN) is critical for applications that range from iceophobic surfaces to ice-templated materials. HIN on 2D materials is a particular interesting topic that still lacks extensive experimental investigations. Here, we focus on the HIN on single-layer graphene (SLG) transferred onto different substrates, including silicon, silica, and thermal oxide on silicon. Complemented by other samples without SLG, we obtain a large range of wetting contact angles (WCAs) from 2° to 95°. All pristine SLG samples exhibit a large contact angle of ∼95°, which is close to the theoretical value of 96° for free-standing SLG, irrespective of the substrate and even in the presence of nanoscale wrinkles on SLG, which are due to the transfer process, indicating that the topographical features have little impact on the wetting behavior. Interestingly, SLG displays changes in hydrophobicity upon repeated water droplet freezing-melting-drying cycles due to a shift in Fermi level and/or enhanced water-substrate polar molecular interactions, likely induced by residual adsorption of H2O molecules. We found that a 0.04 eV decrease in SLG Fermi level reduces the SLG/water interface energy by ∼6 mJ/m2, thereby making SLG less hydrophobic. Counterintuitively, the reduction in SLG/water interface energy and the enhanced hydrophilicity after repeated freezing-melting-evaporation cycles actually decreases the freezing temperature by ∼3-4 °C, thereby slightly retarding rather than enhancing HIN. We also found that the water droplet freezing temperature differed by only ∼1 °C on different substrates with WCAs from 2° to 95°, an intriguing and yet reasonable result that confirms that wettability alone is not a good indicator of HIN capability. The HIN rate is rather determined by the difference between substrate/water and substrate/ice interface energies, which was found to stay almost constant for substrates weakly interacting with water/ice via van der Waals or hydrogen bonds, irrespective of hydrophilicity.
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Affiliation(s)
- Cory Cline
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, United States
| | - Haozhe Wang
- Department of Materials Science and Engineering, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Boston, Massachusetts 02139, United States
| | - Jing Kong
- Department of Materials Science and Engineering, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Boston, Massachusetts 02139, United States
| | - Tianshu Li
- Department of Civil and Environmental Engineering, George Washington University, Washington, D.C. 20052, United States
| | - Jifeng Liu
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, United States
| | - Ulrike G K Wegst
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, United States
- Department of Physics, Northeastern University, Boston, Massachusetts 02115, United States
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10
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Arya V, Chaudhuri A, Bakli C. Coupling solute interactions with functionalized graphene membranes: towards facile membrane-level engineering. NANOSCALE 2022; 14:16661-16672. [PMID: 36330851 DOI: 10.1039/d2nr05552j] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Optimizing ion transport through nanoporous graphene membranes with intricate engineering at nanoscale levels finds applications ranging from ion segregation to desalination. Such membrane-level engineering often requires futuristic and state-of-the-art micro- and nanofabrication infrastructure making it less accessible to widespread applications. In this study, the effective membrane pore size is modulated using macroscopic membrane functionalization, which, when combined with the solute concentration, can prove to be facile nanoscale engineering towards achieving selectivity. By performing robust molecular dynamics (MD) simulations of aqueous NaCl solution through a nanoporous graphene membrane, we demonstrate that varying membrane wettability influences the structural organization of ions and water molecules both in the vicinity and inside the nanopore, which is manifested in the form of altered permeation characteristics. Moreover, the disparate solvation characteristics of the ionic species in conjunction with the variable van der Waals interactive forces affect the ion-selective nature (Cl- over Na+) of the membrane. The relative hydrophilization, resulting from the effective functionalization of the nanoporous graphene membrane, not only allows greater control over the permeation characteristics of ions and water molecules mediated by an altered depletion ratio but also gives rise to the ion-selective nature of the membrane, thus providing a sound understanding of the transport properties of ion-water solutions through nanoporous materials.
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Affiliation(s)
- Vinay Arya
- School of Energy Science and Engineering, Indian Institute of Technology Kharagpur, India.
| | - Abhirup Chaudhuri
- Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, India
| | - Chirodeep Bakli
- School of Energy Science and Engineering, Indian Institute of Technology Kharagpur, India.
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11
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Xu W, Wang Q, Zhou R, Hameed S, Ma Y, Lijuan Xie, Ying Y. Defect-rich graphene-coated metamaterial device for pesticide sensing in rice. RSC Adv 2022; 12:28678-28684. [PMID: 36320498 PMCID: PMC9540250 DOI: 10.1039/d2ra06006j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Accepted: 09/30/2022] [Indexed: 11/11/2022] Open
Abstract
Performing sensitive and selective detection in a mixture is challenging for terahertz (THz) sensors. In light of this, many methods have been developed to detect molecules in complex samples using THz technology. Here we demonstrate a defect-rich monolayer graphene-coated metamaterial operating in the THz regime for pesticide sensing in a mixture through strong local interactions between graphene and external molecules. The monolayer graphene induces a 50% change in the resonant peak excited by the metamaterial absorber that could be easily distinguished by THz imaging. We experimentally show that the Fermi level of the graphene can be tuned by the addition of molecules, which agrees well with our simulation results. Taking chlorpyrifos methyl in the lixivium of rice as a sample, we further show the molecular sensing potential of this device, regardless of whether the target is in a mixture or not.
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Affiliation(s)
- Wendao Xu
- College of Biosystems Engineering and Food Science, Zhejiang University866 Yuhangtang Rd.310058 HangzhouP.R. China,Key Laboratory of Intelligent Equipment and Robotics for Agriculture of Zhejiang ProvinceP.R. China,Key Laboratory of on Site Processing Equipment for Agricultural Products, Ministry of Agriculture and Rural AffairsP.R. China
| | - Qi Wang
- College of Biosystems Engineering and Food Science, Zhejiang University866 Yuhangtang Rd.310058 HangzhouP.R. China,Key Laboratory of Intelligent Equipment and Robotics for Agriculture of Zhejiang ProvinceP.R. China,Key Laboratory of on Site Processing Equipment for Agricultural Products, Ministry of Agriculture and Rural AffairsP.R. China
| | - Ruiyun Zhou
- College of Biosystems Engineering and Food Science, Zhejiang University866 Yuhangtang Rd.310058 HangzhouP.R. China,Key Laboratory of Intelligent Equipment and Robotics for Agriculture of Zhejiang ProvinceP.R. China,Key Laboratory of on Site Processing Equipment for Agricultural Products, Ministry of Agriculture and Rural AffairsP.R. China
| | - Saima Hameed
- College of Biosystems Engineering and Food Science, Zhejiang University866 Yuhangtang Rd.310058 HangzhouP.R. China,Key Laboratory of Intelligent Equipment and Robotics for Agriculture of Zhejiang ProvinceP.R. China,Key Laboratory of on Site Processing Equipment for Agricultural Products, Ministry of Agriculture and Rural AffairsP.R. China
| | - Yungui Ma
- State Key Laboratory for Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University866 Yuhangtang Rd.310058 HangzhouP.R. China
| | - Lijuan Xie
- College of Biosystems Engineering and Food Science, Zhejiang University866 Yuhangtang Rd.310058 HangzhouP.R. China,Key Laboratory of Intelligent Equipment and Robotics for Agriculture of Zhejiang ProvinceP.R. China,Key Laboratory of on Site Processing Equipment for Agricultural Products, Ministry of Agriculture and Rural AffairsP.R. China
| | - Yibin Ying
- College of Biosystems Engineering and Food Science, Zhejiang University866 Yuhangtang Rd.310058 HangzhouP.R. China,Key Laboratory of Intelligent Equipment and Robotics for Agriculture of Zhejiang ProvinceP.R. China,Key Laboratory of on Site Processing Equipment for Agricultural Products, Ministry of Agriculture and Rural AffairsP.R. China
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12
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Lee G, Oh Y, Nam JT, Ji S, Jang AR, Jeong DW, Kang M, Lee SS, Chae S, Cho D, Hwang JY, Lee K, Lee JO. Multifunctional-high resolution imaging plate based on hydrophilic graphene for digital pathology. NANOTECHNOLOGY 2022; 33:505101. [PMID: 36095982 DOI: 10.1088/1361-6528/ac9143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 09/12/2022] [Indexed: 06/15/2023]
Abstract
In the present study, we showed that hydrophilic graphene can serve as an ideal imaging plate for biological specimens. Graphene being a single-atom-thick semi-metal with low secondary electron emission, array tomography analysis of serial sections of biological specimens on a graphene substrate showed excellent image quality with improvedz-axis resolution, without including any conductive surface coatings. However, the hydrophobic nature of graphene makes the placement of biological specimens difficult; graphene functionalized with polydimethylsiloxane oligomer was fabricated using a simple soft lithography technique and then processed with oxygen plasma to provide hydrophilic graphene with minimal damage to graphene. High-quality scanning electron microscopy images of biological specimens free from charging effects or distortion were obtained, and the optical transparency of graphene enabled fluorescence imaging of the specimen; high-resolution correlated electron and light microscopy analysis of the specimen became possible with the hydrophilic graphene plate.
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Affiliation(s)
- Geonhee Lee
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeongro 141, Daejeon, Republic of Korea
| | - Yuna Oh
- Korea Institute of Science and Technology, 5. Hwarang-ro 14-gil, Seongbuk-gu, Seoul, Republic of Korea
| | - Jung Tae Nam
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Jeonbuk, 55324, Republic of Korea
| | - Seulgi Ji
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeongro 141, Daejeon, Republic of Korea
| | - A-Rang Jang
- Division of Electrical, Electronic and Control Engineering, Kongju National University, Cheonan 31080, Republic of Korea
| | - Du Won Jeong
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeongro 141, Daejeon, Republic of Korea
| | - MinSoung Kang
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeongro 141, Daejeon, Republic of Korea
| | - Sun Sook Lee
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeongro 141, Daejeon, Republic of Korea
| | - Soosang Chae
- Department of Nanostructured Materials, Leibniz Institute of Polymer Research Dresden, D-01069, Dresden, Germany
| | - Donghwi Cho
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeongro 141, Daejeon, Republic of Korea
| | - Jun Yeon Hwang
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Jeonbuk, 55324, Republic of Korea
| | - Kyungeun Lee
- Korea Institute of Science and Technology, 5. Hwarang-ro 14-gil, Seongbuk-gu, Seoul, Republic of Korea
| | - Jeong-O Lee
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeongro 141, Daejeon, Republic of Korea
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13
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Park IJ, Kim TI, Choi SY. Charge Transfer Dynamics of Doped Graphene Electrodes for Organic Light-Emitting Diodes. ACS APPLIED MATERIALS & INTERFACES 2022; 14:43907-43916. [PMID: 36123321 DOI: 10.1021/acsami.2c12006] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Atomically thin graphene has attracted immense attention as a future transparent electrode for flat-panel displays owing to its excellent conductivity, optical transparency, and flexibility. In particular, a graphene doping process is essential for implementing graphene-based high-performance devices, and the development of a transparent cathode with a low work function is required to simplify the integration process of thin-film transistors and organic light-emitting diodes (OLEDs) into active matrix displays. In this study, a transparent n-doped graphene cathode is proposed for implementing inverted OLEDs through two types of cesium (Cs)-based doping techniques: a dipping method using wet chemicals and an evaporation method under a vacuum atmosphere. The changes in the chemical structures and work functions of the n-doped graphene electrodes, as well as their surface morphologies and transmittances, were systematically investigated. The n-type doping mechanism of graphene was investigated, and a close relationship between the electrical charge transfer characteristics of graphene transistors and the formation of C-O-Cs complexes was revealed. Finally, an effective Cs-doped graphene electrode was developed, exhibiting a dramatically decreased work function while maintaining high transmittance; therefore, the Cs-doped graphene cathode was successfully integrated with inverted OLEDs with a bottom-light emission structure that exhibited enhanced external quantum efficiency of graphene cathode-based OLEDs. Thus, our findings provide a better understanding of the doping strategies and potential of n-doped graphene as a transparent cathode for developing high-performance future displays.
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Affiliation(s)
- Ick-Joon Park
- Department of Electrical and Electronic Engineering, Joongbu University, Goyang 10279, Korea
| | - Tae In Kim
- Department of Electrical Engineering, Inha University, Incheon 22212, Korea
| | - Sung-Yool Choi
- School of Electrical Engineering, Graphene/2D Materials Research Center, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
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14
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Wettability of MXene films. J Colloid Interface Sci 2022; 622:759-768. [DOI: 10.1016/j.jcis.2022.04.135] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 04/22/2022] [Accepted: 04/23/2022] [Indexed: 12/26/2022]
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15
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Jian Y, Yang C, Zhang J, Qi L, Shi X, Deng H, Du Y. One-step electrodeposition of Janus chitosan coating for metallic implants with anti-corrosion properties. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128498] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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16
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Kim E, Kim D, Kwak K, Nagata Y, Bonn M, Cho M. Wettability of graphene, water contact angle, and interfacial water structure. Chem 2022. [DOI: 10.1016/j.chempr.2022.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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17
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Nguyen NN, Lee H, Lee HC, Cho K. van der Waals Epitaxy of Organic Semiconductor Thin Films on Atomically Thin Graphene Templates for Optoelectronic Applications. Acc Chem Res 2022; 55:673-684. [PMID: 35142485 DOI: 10.1021/acs.accounts.1c00686] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
ConspectusOrganic semiconductors (OSCs) offer unique advantages with respect to mechanical flexibility, low-cost processing, and tunable properties. The optical and electrical properties of devices based on OSCs can be greatly improved when an OSC is coupled with graphene in a certain manner. Our research group has focused on using graphene as a growth template for OSCs and incorporating such high-quality heterostructures into optoelectronic devices. The idea is that graphene's atomically flat surface with a uniform sp2 carbon network can serve as a perfect quasi-epitaxial template for the growth of OSCs. In addition, OSC-graphene heterostructures benefit from graphene's unique characteristics, such as its high charge-carrier mobility, excellent optical transparency, and fascinating mechanical durability and flexibility.However, we have often found that OSC molecules assemble on graphene in unpredictable manners that vary from batch to batch. From observations of numerous research systems, we elucidated the mechanism underlying such poor repeatability and set out a framework to actually control the template effect of graphene on OSCs. In this Account, we not only present our scientific findings in this spectrum of areas but also convey our research scheme to the readers so that similar heterostructure complexes can be systematically studied.We began with experiments showing that the growth of OSCs on a graphene surface was driven by van der Waals interactions and is therefore sensitive to the cleanliness of the graphene surface. Nonetheless, we noted that, even on similarly clean graphene surfaces, the OSC thin film still varied with the underlying substrate. Thanks to the graphene-transfer method and in situ gating methods that we developed, we discovered that the decisive parameter for molecule-graphene interaction (and, hence, for the growth of OSCs on graphene) is the charge density in the graphene. Thus, to prepare a graphene template for high-quality graphene-OSC heterostructures, we controlled the charge density in the graphene to minimize the molecule-graphene interaction. Moreover, the possible charge transfer between OSC molecules and graphene, which induces additional molecule-graphene interactions, should also be taken into account. Eventually, we demonstrated a wide range of optoelectronic applications that benefitted from high-quality OSC-graphene heterostructures fabricated using our proof-of-concept systems.
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Affiliation(s)
- Nguyen Ngan Nguyen
- Center for Advancing Electronics Dresden (cfaed) and Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
| | - Hansol Lee
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
- Department of Chemical and Biological Engineering, Gachon University, Seongnam, Gyeonggi 13120, Republic of Korea
| | - Hyo Chan Lee
- Department of Chemical Engineering, Myoungji University, Yongin 17058, Republic of Korea
| | - Kilwon Cho
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
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18
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Khedri M, Beheshtizadeh N, Maleki R, Webster TJ, Rezvantalab S. Improving the self-assembly of bioresponsive nanocarriers by engineering doped nanocarbons: a computational atomistic insight. Sci Rep 2021; 11:21538. [PMID: 34728678 PMCID: PMC8564517 DOI: 10.1038/s41598-021-00817-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 10/18/2021] [Indexed: 11/09/2022] Open
Abstract
Here, molecular dynamics (MD) simulations were employed to explore the self-assembly of polymers and docetaxel (DTX) as an anticancer drug in the presence of nitrogen, phosphorous, and boron-nitrogen incorporated graphene and fullerene. The electrostatic potential and the Gibbs free energy of the self-assembled materials were used to optimize the atomic doping percentage of the N- and P-doped formulations at 10% and 50%, respectively. Poly lactic-glycolic acid (PLGA)- polyethylene glycol (PEG)-based polymeric nanoparticles were assembled in the presence of nanocarbons in the common (corresponding to the bulk environment) and interface of organic/aqueous solutions (corresponding to the microfluidic environment). Assessment of the modeling results (e.g., size, hydrophobicity, and energy) indicated that among the nanocarbons, the N-doped graphene nanosheet in the interface method created more stable polymeric nanoparticles (PNPs). Energy analysis demonstrated that doping with nanocarbons increased the electrostatic interaction energy in the self-assembly process. On the other hand, the fullerene-based nanocarbons promoted van der Waals intramolecular interactions in the PNPs. Next, the selected N-doped graphene nanosheet was utilized to prepare nanoparticles and explore the physicochemical properties of the nanosheets in the permeation of the resultant nanoparticles through cell-based lipid bilayer membranes. In agreement with the previous results, the N-graphene assisted PNP in the interface method and was translocated into and through the cell membrane with more stable interactions. In summary, the present MD simulation results demonstrated the success of 2D graphene dopants in the nucleation and growth of PLGA-based nanoparticles for improving anticancer drug delivery to cells, establishing new promising materials and a way to assess their performance that should be further studied.
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Affiliation(s)
- Mohammad Khedri
- Computational Biology and Chemistry Group (CBCG), Universal Scientific Education and Research Network (USERN), Tehran, Iran
- Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Avenue, Tehran, Iran
| | - Nima Beheshtizadeh
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
- Regenerative Medicine Group (REMED), Universal Scientific Education and Research Network (USERN), Tehran, Iran
| | - Reza Maleki
- Computational Biology and Chemistry Group (CBCG), Universal Scientific Education and Research Network (USERN), Tehran, Iran
| | - Thomas J Webster
- Department of Chemical Engineering, Northeastern University, Boston, MA, USA
| | - Sima Rezvantalab
- Renewable Energies Department, Faculty of Chemical Engineering, Urmia University of Technology, Urmia, 57166-419, Iran.
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19
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Qin Y, Xue C, Yu H, Wen Y, Zhang L, Li Y. The construction of bio-inspired hierarchically porous graphene aerogel for efficiently organic pollutants absorption. JOURNAL OF HAZARDOUS MATERIALS 2021; 419:126441. [PMID: 34175706 DOI: 10.1016/j.jhazmat.2021.126441] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 06/10/2021] [Accepted: 06/18/2021] [Indexed: 06/13/2023]
Abstract
Three-dimensional graphene aerogel shows a wide application in many frontier domains, which have attracted extensive research interest owing to its large specific surface area and high porosity. However, it is still a great challenge to construct the ideal hierarchical pore structure while guaranteeing excellent absorption and mechanical performance. In this paper, inspired by the bio-based porous material, a hierarchical graphene aerogel with inter-connected micro-/nano-scale pore structure was constructed. The micro and nano-scale pores are generated by the bubble and nanoparticles (NPs) template, respectively. The resulting graphene aerogel (GA) presents low density, increased interfacial areas, high mechanical performance, and excellent absorption performance towards a mass of organic solvents. In combination with its high compressibility, a diverse organic solvent can be absorbed efficiently and recycled by extrusion conveniently. Besides, owing to the scattered hydrophilic sites of functional groups and NPs on the surface of GA-b/NP, it shows high adhesion properties for water droplets, thus presents great potential in high-efficiency fog collecting materials. In a word, the proposed approach presents a novel strategy for the construction of the hierarchical aerogel with light-weight and elasticity, as well as the achievement of efficient functionalization, which has great potential for the preparation of diverse functional composites.
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Affiliation(s)
- Yan Qin
- Key Lab. of Colloid and Interface Chemistry of State Education Ministry, Shandong University, Jinan 250100, China
| | - Chunlong Xue
- Key Lab. of Colloid and Interface Chemistry of State Education Ministry, Shandong University, Jinan 250100, China
| | - Haoran Yu
- Key Lab. of Colloid and Interface Chemistry of State Education Ministry, Shandong University, Jinan 250100, China
| | - Yutong Wen
- Key Lab. of Colloid and Interface Chemistry of State Education Ministry, Shandong University, Jinan 250100, China
| | - Lina Zhang
- Key Lab. of Colloid and Interface Chemistry of State Education Ministry, Shandong University, Jinan 250100, China
| | - Ying Li
- Key Lab. of Colloid and Interface Chemistry of State Education Ministry, Shandong University, Jinan 250100, China.
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20
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Wang Y, Wang G, He M, Liu F, Han M, Tang T, Luo S. Multifunctional Laser-Induced Graphene Papers with Combined Defocusing and Grafting Processes for Patternable and Continuously Tunable Wettability from Superlyophilicity to Superlyophobicity. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2103322. [PMID: 34523240 DOI: 10.1002/smll.202103322] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 07/21/2021] [Indexed: 06/13/2023]
Abstract
Functional surfaces with tunable and patternable wettability have attracted significant research interests because of remarkable advantages in biomedicine, environmental, and energy storage applications. Based on combined defocusing and grafting strategy for processing laser-induced graphene papers (LIGPs) with variable surface roughness (58.18-6.08 µm) and F content (0-25.9%), their wettability can be tuned continuously from superlyophilicity (contact angle CA ≈ 0° ) to superlyophobicity (CA > 150° ), for various liquids with a wide range of surface tensions from 27.5 to 72.8 mN m-1 . In addition to reaching multiple wetting characteristics including amphiphilic, amphiphobic, and hydrophobic-oleophilic states, three designable processes are further developed for achieving LIGPs with various wetting patterns, including hydrophilic arrays or channels, hydrophobic-to-hydrophilic gradients, and Janus. Activated by the customly designed structures and properties, multifunctional and multi-scenario applications are successfully attempted, including 2D-/3D- directional cell cultivation, water transportation diode, self-triggered liquid transfer & collection, etc.
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Affiliation(s)
- Yanan Wang
- School of Mechanical Engineering & Automation, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, China
| | - Guantao Wang
- School of Mechanical Engineering & Automation, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, China
| | - Meihong He
- School of Mechanical Engineering & Automation, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, China
| | - Fu Liu
- School of Mechanical Engineering & Automation, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, China
| | - Mingguang Han
- School of Mechanical Engineering & Automation, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, China
| | - Tan Tang
- School of Mechanical Engineering & Automation, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, China
| | - Sida Luo
- School of Mechanical Engineering & Automation, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, China
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21
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Mirabito T, Huet B, Redwing JM, Snyder DW. Influence of the Underlying Substrate on the Physical Vapor Deposition of Zn-Phthalocyanine on Graphene. ACS OMEGA 2021; 6:20598-20610. [PMID: 34396005 PMCID: PMC8359151 DOI: 10.1021/acsomega.1c02758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 07/15/2021] [Indexed: 06/13/2023]
Abstract
Graphene shows great promise not only as a highly conductive flexible and transparent electrode for fabricating novel device architectures but also as an ideal synthesis platform for studying fundamental growth mechanisms of various materials. In particular, directly depositing metal phthalocyanines (MPc's) on graphene is viewed as a compelling approach to improve the performance of organic photovoltaics and light-emitting diodes. In this work, we systematically investigate the ZnPc physical vapor deposition (PVD) on graphene either as-grown on Cu or as-transferred on various substrates including Si(100), C-plane sapphire, SiO2/Si, and h-BN. To better understand the effect of the substrate on the ZnPc structure and morphology, we also compare the ZnPc growth on highly crystalline single- and multilayer graphene. The experiments show that, for identical deposition conditions, ZnPc exhibits various morphologies such as high-aspect-ratio nanowires or a continuous film when changing the substrate supporting graphene. ZnPc morphology is also found to transition from a thin film to a nanowire structure when increasing the number of graphene layers. Our observations suggest that substrate-induced changes in graphene affect the adsorption, surface diffusion, and arrangement of ZnPc molecules. This study provides clear guidelines to control MPc crystallinity, morphology, and molecular orientations which drastically influence the (opto)electronic properties.
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Affiliation(s)
- Timothy Mirabito
- Applied
Research Laboratory (ARL), The Pennsylvania
State University, University
Park, Pennsylvania 16802, United States
- Department
of Materials Science and Engineering, The
Pennsylvania State University, University Park, Pennsylvania 16802, United States
- 2D Crystal
Consortium (2DCC), Materials Research Institute (MRI), The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Benjamin Huet
- Applied
Research Laboratory (ARL), The Pennsylvania
State University, University
Park, Pennsylvania 16802, United States
- Department
of Materials Science and Engineering, The
Pennsylvania State University, University Park, Pennsylvania 16802, United States
- 2D Crystal
Consortium (2DCC), Materials Research Institute (MRI), The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Joan M. Redwing
- Department
of Materials Science and Engineering, The
Pennsylvania State University, University Park, Pennsylvania 16802, United States
- 2D Crystal
Consortium (2DCC), Materials Research Institute (MRI), The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - David W. Snyder
- Applied
Research Laboratory (ARL), The Pennsylvania
State University, University
Park, Pennsylvania 16802, United States
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22
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Greenwood G, Kim JM, Zheng Q, Nahid SM, Nam S, Espinosa-Marzal RM. Effects of Layering and Supporting Substrate on Liquid Slip at the Single-Layer Graphene Interface. ACS NANO 2021; 15:10095-10106. [PMID: 34114798 DOI: 10.1021/acsnano.1c01884] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Understanding modulation of liquid molecule slippage along graphene surfaces is crucial for many promising applications of two-dimensional materials, such as in sensors, nanofluidic devices, and biological systems. Here, we use force measurements by atomic force microscopy (AFM) to directly measure hydrodynamic, solvation, and frictional forces along the graphene plane in seven liquids. The results show that the greater slip lengths correlate with the interfacial ordering of the liquid molecules, which suggests that the ordering of the liquid forming multiple layers promotes slip. This phenomenon appears to be more relevant than solely the wetting behavior of graphene or the solid-liquid interaction energy, as traditionally assumed. Furthermore, the slip boundary condition of the liquids along the graphene plane is sensitive to the substrate underneath graphene, indicating that the underlying substrate affects graphene's interaction with the liquid molecules. Because interfacial slip can have prominent consequences on the pressure drop, on electrical and diffusive transport through nanochannels, and on lubrication, this work can inspire innovation in many applications through the modulation of the substrate underneath graphene and of the interfacial ordering of the liquid.
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Affiliation(s)
- Gus Greenwood
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Matthews Avenue, Urbana, Illinois 61801, United States
| | - Jin Myung Kim
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, Illinois 61801, United States
| | - Qianlu Zheng
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Matthews Avenue, Urbana, Illinois 61801, United States
| | - Shahriar Muhammad Nahid
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, Illinois 61801, United States
| | - SungWoo Nam
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, Illinois 61801, United States
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, Illinois 61801, United States
| | - Rosa M Espinosa-Marzal
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Matthews Avenue, Urbana, Illinois 61801, United States
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, Illinois 61801, United States
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23
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Pham TT, Pham TN, Chihaia V, Vu QA, Trinh TT, Pham TT, Van Thang L, Son DN. How do the doping concentrations of N and B in graphene modify the water adsorption? RSC Adv 2021; 11:19560-19568. [PMID: 35479230 PMCID: PMC9033564 DOI: 10.1039/d1ra01506k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 05/14/2021] [Indexed: 12/17/2022] Open
Abstract
Understanding the interaction of water and graphene is crucial for various applications such as water purification, desalination, and electrocatalysis. Experimental and theoretical studies have already investigated water adsorption on N- and B-doped graphene. However, there are no reports available that elucidate the influences of the N and B doping content in graphene on the microscopic geometrical structure and the electronic properties of the adsorbed water. Thus, this work is devoted to solving this problem using self-consistent van der Waals density functional theory calculations. The N and B doping contents of 0.0, 3.1, 6.3, and 9.4% were considered. The results showed that the binding energy of water increases almost linearly as a function of doping content at all concentrations for N-doped graphene but below 6.3% for B-doped graphene. In the linear range, the binding energy increases by approximately 30 meV for each increment of the doping ratio. Analyses of the geometric and electronic structures explained the enhancement of the water-graphene interaction with the variation in doping percentage.
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Affiliation(s)
- Thi Tan Pham
- Ho Chi Minh City University of Technology 268 Ly Thuong Kiet Street, Ward 14, District 10 Ho Chi Minh City Vietnam .,Vietnam National University Ho Chi Minh City Quarter 6, Linh Trung Ward, Thu Duc District Ho Chi Minh City Vietnam
| | - Thanh Ngoc Pham
- Ho Chi Minh City University of Technology 268 Ly Thuong Kiet Street, Ward 14, District 10 Ho Chi Minh City Vietnam .,Vietnam National University Ho Chi Minh City Quarter 6, Linh Trung Ward, Thu Duc District Ho Chi Minh City Vietnam
| | - Viorel Chihaia
- Institute of Physical Chemistry "Ilie Murgulescu" of the Romanian Academy Splaiul Independentei 202, Sector 6 060021 Bucharest Romania
| | - Quang Anh Vu
- Ho Chi Minh City University of Technology 268 Ly Thuong Kiet Street, Ward 14, District 10 Ho Chi Minh City Vietnam .,Vietnam National University Ho Chi Minh City Quarter 6, Linh Trung Ward, Thu Duc District Ho Chi Minh City Vietnam
| | - Thuat T Trinh
- Department of Civil and Environmental Engineering, Norwegian University of Science and Technology NO-7491 Trondheim Norway
| | - Trung Thanh Pham
- Namur Institute of Structured Matter (NISM), Department of Physics, University of Namur 61 Rue de Bruxelles B-5000 Namur Belgium
| | - Le Van Thang
- Ho Chi Minh City University of Technology 268 Ly Thuong Kiet Street, Ward 14, District 10 Ho Chi Minh City Vietnam .,Vietnam National University Ho Chi Minh City Quarter 6, Linh Trung Ward, Thu Duc District Ho Chi Minh City Vietnam
| | - Do Ngoc Son
- Ho Chi Minh City University of Technology 268 Ly Thuong Kiet Street, Ward 14, District 10 Ho Chi Minh City Vietnam .,Vietnam National University Ho Chi Minh City Quarter 6, Linh Trung Ward, Thu Duc District Ho Chi Minh City Vietnam
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24
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Xin G, Wang M, Zhai Y, Zhang B, Song J, Liu X. Functionalization of Self-supporting Graphene with a High Grafting Yield for Hydrophilicity Improvement. CHEM LETT 2021. [DOI: 10.1246/cl.200632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Guoxiang Xin
- School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, P. R. China
| | - Mengmeng Wang
- School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, P. R. China
| | - Yao Zhai
- School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, P. R. China
| | - Bangwen Zhang
- School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, P. R. China
| | - Jinling Song
- School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, P. R. China
| | - Xiaoxu Liu
- Faculty of Physics, Hebei Normal University of Science and Technology, Qinhuangdao 066004, P. R. China
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25
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Son J, Lee JY, Han N, Cha J, Choi J, Kwon J, Nam S, Yoo KH, Lee GH, Hong J. Tunable Wettability of Graphene through Nondestructive Hydrogenation and Wettability-Based Patterning for Bioapplications. NANO LETTERS 2020; 20:5625-5631. [PMID: 32275158 DOI: 10.1021/acs.nanolett.9b04548] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The wettability of graphene has been extensively studied and successfully modified by chemical functionalization. Nevertheless, the unavoidable introduction of undesired defects and the absence of systematic and local control over wettability by previous methods have limited the use of graphene in applications. In addition, microscale patterning, according to wettability, has not been attempted. Here, we demonstrate that the wettability of graphene can be systematically controlled and surface patterned into microscale sections based on wettability without creating significant defects, possible by nondestructive hydrogen plasma. Hydrophobic graphene is progressively converted to hydrophilic hydrogenated graphene (H-Gr) that reaches superhydrophilicity. The great contrast in wettability between graphene and H-Gr makes it possible to selectively position and isolate human breast cancer cells on arrays of micropatterns since strong hydrophilicity facilitates the adsorption of the cells. We believe that our method will provide an essential technique for enabling surface and biological applications requiring microscale patterns with different wettability.
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Affiliation(s)
- Jangyup Son
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Jong-Young Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Nalae Han
- Department of Physics, Yonsei University, Seoul 03722, Korea
| | - Jongin Cha
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Jonghyun Choi
- Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana 61801, United States
| | - Junyoung Kwon
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - SungWoo Nam
- Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana 61801, United States
| | - Kyung-Hwa Yoo
- Department of Physics, Yonsei University, Seoul 03722, Korea
| | - Gwan-Hyoung Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Jongill Hong
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
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26
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Zhou G, Huang L. A review of recent advances in computational and experimental analysis of first adsorbed water layer on solid substrate. MOLECULAR SIMULATION 2020. [DOI: 10.1080/08927022.2020.1786086] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Guobing Zhou
- School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, OK, USA
| | - Liangliang Huang
- School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, OK, USA
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27
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Deng X, Nie Q, Wu Y, Fang H, Zhang P, Xie Y. Nitrogen-Doped Unusually Superwetting, Thermally Insulating, and Elastic Graphene Aerogel for Efficient Solar Steam Generation. ACS APPLIED MATERIALS & INTERFACES 2020; 12:26200-26212. [PMID: 32394701 DOI: 10.1021/acsami.0c05666] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
By removing the oxygen-containing functional groups, thermal treatment in inert gas has been widely reported to improve the hydrophobicity of carbon materials. However, this work reports a contrary phenomenon for the nitrogen-doped graphene aerogel (NGA). As the temperature of thermal treatment increases from 200 to 1000 °C, NGA becomes more and more hydrophilic and the superwetting property remains for weeks in air. To uncover this unusual phenomenon, the effect of nitrogen doping is studied through both experiment and MD simulations. The effects of air exposure and air humidity are further investigated in detail to illustrate the whole physical picture clearly. The superwetting behavior is attributed to the preferential adsorption of water molecules to the nitrogen-doped sites, which significantly inhibits airborne hydrocarbon adsorption. In combination with the excellent properties including mechanical elasticity, high light absorption, and good thermal insulation, an efficient photothermal and solar steam generation performance is demonstrated by using NGA-600 as the photothermal material, presenting a high energy conversion efficiency of 86.2% and good recycling stability.
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Affiliation(s)
- Xin Deng
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong 518055, P. R. China
| | - Qichun Nie
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Yu Wu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong 518055, P. R. China
| | - Haisheng Fang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Peixin Zhang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong 518055, P. R. China
| | - Yangsu Xie
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong 518055, P. R. China
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28
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Wang S, Wang C, Peng Z, Chen S. Spontaneous dewetting transition of nanodroplets on nanopillared surface. NANOTECHNOLOGY 2020; 31:225502. [PMID: 32066123 DOI: 10.1088/1361-6528/ab76f1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The spontaneous dewetting transition (SDT) of nanoscale droplets on the nanopillared surface is studied by molecular dynamics simulations. Three typical SDT modes, i.e. condensing, merging and coalescing with flying droplets are observed, and the underlying physical mechanism is clearly revealed by the potential energy analysis of droplets. We find that there exists a dimensionless parameter of the relative critical volume of droplet C cri which completely controls the SDT of nanodroplets. Furthermore, the C cri remains constant for geometrically similar surfaces, which indicates an intrinsic similarity of nanoscale SDT. The effect of pillar height, diameter and spacing on SDT has also been studied and it is likely to occur on the surface with longer, wider and thicker pillars, as well as pillars with cone-like shape and larger hydrophobicity. These results should be useful for a complete understanding of the nanoscale SDT and shed light on the design of smart superhydrophobic surfaces.
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Affiliation(s)
- Shuai Wang
- Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, 100081, People's Republic of China. Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures, Beijing Institute of Technology, Beijing, 100081, People's Republic of China
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29
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Xiao C, Chen C, Yao Y, Liu H, Chen L, Qian L, Kim SH. Nanoasperity Adhesion of the Silicon Surface in Humid Air: The Roles of Surface Chemistry and Oxidized Layer Structures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:5483-5491. [PMID: 32357012 DOI: 10.1021/acs.langmuir.0c00205] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The interfacial adhesion between silicon oxide surfaces is normally believed to be governed by the surface chemistry of the topmost surface affecting the water contact angle and hydrogen bonding interactions. In the case of a silicon wafer, the physical structure of the native oxide at the surface can vary drastically depending on the aging process; thus, not only the surface chemistry but also the history of surface treatment can also have a profound impact on nanoasperity adhesion. This study reports the effect of aging conditions (ambient air, liquid water, and liquid ethanol) on the nanoasperity adhesion behaviors of a silicon surface. When the silicon surface is kept in liquid alcohol, the surface remains hydrophobic, and adhesion in ambient air can be explained with the capillary effect of the liquid meniscus condensed around the annulus of the nanoasperity contact. When the silicon surface is oxidized in ambient air, the surface gradually becomes hydrophilic, and the strongly hydrogen-bonded water network of adsorbed water plays a dominant role in the nanoasperity interfacial adhesion force. When the silicon surface is aged in liquid water, the interfacial adhesion force measured in ambient air is significantly larger than the value predicted from the theoretical model based on the water contact angle and the hydrogen bonding interaction at the topmost surface. This is because the surface layer oxidized in liquid water is gel-like and thus can swell upon uptake of water from the humid air. To fully encompass all these behaviors, a solid-adsorbate-solid model predicting the adhesion force is developed by introducing a fitting parameter β, which can be adjusted depending on the adsorbed water structure and the swelling capacity of the oxidized surface layer.
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Affiliation(s)
- Chen Xiao
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
- Department of Chemical Engineering and Materials Research Institute, The Pennsylvania State University, University Park, State College, Pennsylvania 16802, United States
| | - Chao Chen
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
| | - Yangyang Yao
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
| | - Hongshen Liu
- Department of Chemical Engineering and Materials Research Institute, The Pennsylvania State University, University Park, State College, Pennsylvania 16802, United States
| | - Lei Chen
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
| | - Linmao Qian
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
| | - Seong H Kim
- Department of Chemical Engineering and Materials Research Institute, The Pennsylvania State University, University Park, State College, Pennsylvania 16802, United States
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30
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Nguyen NN, Lee HC, Yoo MS, Lee E, Lee H, Lee SB, Cho K. Charge-Transfer-Controlled Growth of Organic Semiconductor Crystals on Graphene. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:1902315. [PMID: 32195079 PMCID: PMC7080519 DOI: 10.1002/advs.201902315] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 11/09/2019] [Indexed: 06/10/2023]
Abstract
Controlling the growth behavior of organic semiconductors (OSCs) is essential because it determines their optoelectronic properties. In order to accomplish this, graphene templates with electronic-state tunability are used to affect the growth of OSCs by controlling the van der Waals interaction between OSC ad-molecules and graphene. However, in many graphene-molecule systems, the charge transfer between an ad-molecule and a graphene template causes another important interaction. This charge-transfer-induced interaction is never considered in the growth scheme of OSCs. Here, the effects of charge transfer on the formation of graphene-OSC heterostructures are investigated, using fullerene (C60) as a model compound. By in situ electrical doping of a graphene template to suppress the charge transfer between C60 ad-molecules and graphene, the layer-by-layer growth of a C60 film on graphene can be achieved. Under this condition, the graphene-C60 interface is free of Fermi-level pinning; thus, barristors fabricated on the graphene-C60 interface show a nearly ideal Schottky-Mott limit with efficient modulation of the charge-injection barrier. Moreover, the optimized C60 film exhibits a high field-effect electron mobility of 2.5 cm2 V-1 s-1. These results provide an efficient route to engineering highly efficient optoelectronic graphene-OSC hybrid material applications.
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Affiliation(s)
- Nguyen Ngan Nguyen
- Department of Chemical EngineeringPohang University of Science and TechnologyPohang37673Republic of Korea
| | - Hyo Chan Lee
- Department of Chemical EngineeringPohang University of Science and TechnologyPohang37673Republic of Korea
| | - Min Seok Yoo
- Department of Chemical EngineeringPohang University of Science and TechnologyPohang37673Republic of Korea
| | - Eunho Lee
- Department of Chemical EngineeringPohang University of Science and TechnologyPohang37673Republic of Korea
| | - Hansol Lee
- Department of Chemical EngineeringPohang University of Science and TechnologyPohang37673Republic of Korea
| | - Seon Baek Lee
- Department of Chemical EngineeringPohang University of Science and TechnologyPohang37673Republic of Korea
| | - Kilwon Cho
- Department of Chemical EngineeringPohang University of Science and TechnologyPohang37673Republic of Korea
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31
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Wagemann E, Wang Y, Das S, Mitra SK. On the wetting translucency of hexagonal boron nitride. Phys Chem Chem Phys 2020; 22:7710-7718. [DOI: 10.1039/d0cp00200c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
When a drop sits on an atomically thin coating supported by a hydrophilic material, it is possible that the underlying substrate influences the equilibrium contact angle. Such behavior is known as the wetting translucency effect.
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Affiliation(s)
- Enrique Wagemann
- Micro & Nano-Scale Transport Laboratory
- Waterloo Institute for Nanotechnology
- Department of Mechanical and Mechatronics Engineering
- University of Waterloo
- Waterloo
| | - Yanbin Wang
- Department of Mechanical Engineering
- University of Maryland
- College Park
- USA
| | - Siddhartha Das
- Department of Mechanical Engineering
- University of Maryland
- College Park
- USA
| | - Sushanta K. Mitra
- Micro & Nano-Scale Transport Laboratory
- Waterloo Institute for Nanotechnology
- Department of Mechanical and Mechatronics Engineering
- University of Waterloo
- Waterloo
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32
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Presel F, Gijón A, Hernández ER, Lacovig P, Lizzit S, Alfè D, Baraldi A. Translucency of Graphene to van der Waals Forces Applies to Atoms/Molecules with Different Polar Character. ACS NANO 2019; 13:12230-12241. [PMID: 31589408 DOI: 10.1021/acsnano.9b07277] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Graphene has been proposed to be either fully transparent to van der Waals interactions to the extent of allowing switching between hydrophobic and hydrophilic behavior, or partially transparent (translucent), yet there has been considerable debate on this topic, which is still ongoing. In a combined experimental and theoretical study we investigate the effects of different metal substrates on the adsorption energy of atomic (argon) and molecular (carbon monoxide) adsorbates on high-quality epitaxial graphene. We demonstrate that while the adsorption energy is certainly affected by the chemical composition of the supporting substrate and by the corrugation of the carbon lattice, the van der Waals interactions between adsorbates and the metal surfaces are partially screened by graphene. Our results indicate that the concept of graphene translucency, already introduced in the case of water droplets, is found to hold more generally also in the case of single polar molecules and atoms, which are apolar.
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Affiliation(s)
- Francesco Presel
- Physics Department , University of Trieste , Via Valerio 2 , 34127 Trieste , Italy
| | - Alfonso Gijón
- Instituto de Ciencia de Materiales de Madrid - ICMM-CSIC) , Campus de Cantoblanco , 28049 Madrid , Spain
| | - Eduardo R Hernández
- Instituto de Ciencia de Materiales de Madrid - ICMM-CSIC) , Campus de Cantoblanco , 28049 Madrid , Spain
| | - Paolo Lacovig
- Elettra-Sincrotrone Trieste S.C.p.A. , Strada Statale 14 Km 163.5 , 34149 Trieste , Italy
| | - Silvano Lizzit
- Elettra-Sincrotrone Trieste S.C.p.A. , Strada Statale 14 Km 163.5 , 34149 Trieste , Italy
| | - Dario Alfè
- Department of Earth Sciences, Department of Physics and Astronomy , TYC@UCL , London WC1E 6BT , United Kingdom
- London Centre for Nanotechnology , University College London , Gower Street , London WC1E 6BT , United Kingdom
- Dipartimento di Fisica Ettore Pancini , Università di Napoli Federico II , Monte S. Angelo, 80126 Napoli , Italy
| | - Alessandro Baraldi
- Physics Department , University of Trieste , Via Valerio 2 , 34127 Trieste , Italy
- Elettra-Sincrotrone Trieste S.C.p.A. , Strada Statale 14 Km 163.5 , 34149 Trieste , Italy
- IOM-CNR , Laboratorio TASC , AREA Science Park, S.S. 14 km 163.5 , 34149 Trieste , Italy
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33
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Zhang W, Wei S, Wu Y, Wang YL, Zhang M, Roy D, Wang H, Yuan J, Zhao Q. Poly(Ionic Liquid)-Derived Graphitic Nanoporous Carbon Membrane Enables Superior Supercapacitive Energy Storage. ACS NANO 2019; 13:10261-10271. [PMID: 31509375 DOI: 10.1021/acsnano.9b03514] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
High energy/power density, capacitance, and long-life cycles are urgently demanded for energy storage electrodes. Porous carbons as benchmark commercial electrode materials are underscored by their (electro)chemical stability and wide accessibility, yet are often constrained by moderate performances associated with their powdery status. Here via controlled vacuum pyrolysis of a poly(ionic liquid) membrane template, advantageous features including good conductivity (132 S cm-1 at 298 K), interconnected hierarchical pores, large specific surface area (1501 m2 g-1), and heteroatom doping are realized in a single carbon membrane electrode. The structure synergy at multiple length scales enables large areal capacitances both for a basic aqueous electrolyte (3.1 F cm-2) and for a symmetric all-solid-state supercapacitor (1.0 F cm-2), together with superior energy densities (1.72 and 0.14 mW h cm-2, respectively) without employing a current collector. In addition, theoretical calculations verify a synergistic heteroatom co-doping effect beneficial to the supercapacitive performance. This membrane electrode is scalable and compatible for device fabrication, highlighting the great promise of a poly(ionic liquid) for designing graphitic nanoporous carbon membranes in advanced energy storage.
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Affiliation(s)
- Weiyi Zhang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering , Huazhong University of Science and Technology , Wuhan , 430074 , China
- Department of Chemistry and Biomolecular Science & Center for Advanced Materials Processing , Clarkson University , 8 Clarkson Avenue , Potsdam , New York 13699 , United States
- Department of Materials and Environmental Chemistry , Stockholm University , Svante Arrheniusväg 16C , Stockholm , 10691 , Sweden
| | - Shen Wei
- Department of Physics , Clarkson University , 8 Clarkson Avenue , Potsdam , New York 13699 , United States
| | - Yongneng Wu
- Department of Chemistry and Biomolecular Science & Center for Advanced Materials Processing , Clarkson University , 8 Clarkson Avenue , Potsdam , New York 13699 , United States
| | - Yong-Lei Wang
- Department of Materials and Environmental Chemistry , Stockholm University , Svante Arrheniusväg 16C , Stockholm , 10691 , Sweden
| | - Miao Zhang
- Department of Materials and Environmental Chemistry , Stockholm University , Svante Arrheniusväg 16C , Stockholm , 10691 , Sweden
| | - Dipankar Roy
- Department of Physics , Clarkson University , 8 Clarkson Avenue , Potsdam , New York 13699 , United States
| | - Hong Wang
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry , Nankai University , Tianjin , 300071 , China
| | - Jiayin Yuan
- Department of Chemistry and Biomolecular Science & Center for Advanced Materials Processing , Clarkson University , 8 Clarkson Avenue , Potsdam , New York 13699 , United States
- Department of Materials and Environmental Chemistry , Stockholm University , Svante Arrheniusväg 16C , Stockholm , 10691 , Sweden
| | - Qiang Zhao
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering , Huazhong University of Science and Technology , Wuhan , 430074 , China
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34
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Ramos-Alvarado B. Water wettability of graphene and graphite, optimization of solid-liquid interaction force fields, and insights from mean-field modeling. J Chem Phys 2019; 151:114701. [DOI: 10.1063/1.5118888] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Bladimir Ramos-Alvarado
- Department of Mechanical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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35
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Thickness and Structure of Adsorbed Water Layer and Effects on Adhesion and Friction at Nanoasperity Contact. COLLOIDS AND INTERFACES 2019. [DOI: 10.3390/colloids3030055] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Most inorganic material surfaces exposed to ambient air can adsorb water, and hydrogen bonding interactions among adsorbed water molecules vary depending on, not only intrinsic properties of material surfaces, but also extrinsic working conditions. When dimensions of solid objects shrink to micro- and nano-scales, the ratio of surface area to volume increases greatly and the contribution of water condensation on interfacial forces, such as adhesion (Fa) and friction (Ft), becomes significant. This paper reviews the structural evolution of the adsorbed water layer on solid surfaces and its effect on Fa and Ft at nanoasperity contact for sphere-on-flat geometry. The details of the underlying mechanisms governing water adsorption behaviors vary depending on the atomic structure of the substrate, surface hydrophilicity and atmospheric conditions. The solid surfaces reviewed in this paper include metal/metallic oxides, silicon/silicon oxides, fluorides, and two-dimensional materials. The mechanism by which water condensation influences Fa is discussed based on the competition among capillary force, van der Waals force and the rupture force of solid-like water bridge. The condensed meniscus and the molecular configuration of the water bridge are influenced by surface roughness, surface hydrophilicity, temperature, sliding velocity, which in turn affect the kinetics of water condensation and interfacial Ft. Taking the effects of the thickness and structure of adsorbed water into account is important to obtain a full understanding of the interfacial forces at nanoasperity contact under ambient conditions.
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36
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Kwon SS, Choi J, Heiranian M, Kim Y, Chang WJ, Knapp PM, Wang MC, Kim JM, Aluru NR, Park WI, Nam S. Electrical Double Layer of Supported Atomically Thin Materials. NANO LETTERS 2019; 19:4588-4593. [PMID: 31203634 DOI: 10.1021/acs.nanolett.9b01563] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The electrical double layer (EDL), consisting of two parallel layers of opposite charges, is foundational to many interfacial phenomena and unique in atomically thin materials. An important but unanswered question is how the "transparency" of atomically thin materials to their substrates influences the formation of the EDL. Here, we report that the EDL of graphene is directly affected by the surface energy of the underlying substrates. Cyclic voltammetry and electrochemical impedance spectroscopy measurements demonstrate that graphene on hydrophobic substrates exhibits an anomalously low EDL capacitance, much lower than what was previously measured for highly oriented pyrolytic graphite, suggesting disturbance of the EDL ("disordered EDL") formation due to the substrate-induced hydrophobicity to graphene. Similarly, electrostatic gating using EDL of graphene field-effect transistors shows much lower transconductance levels or even no gating for graphene on hydrophobic substrates, further supporting our hypothesis. Molecular dynamics simulations show that the EDL structure of graphene on a hydrophobic substrate is disordered, caused by the disruption of water dipole assemblies. Our study advances understanding of EDL in atomically thin limit.
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Affiliation(s)
- Sun Sang Kwon
- Division of Materials Science and Engineering , Hanyang University , Seoul 04763 , Korea
| | - Jonghyun Choi
- Department of Mechanical Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Mohammad Heiranian
- Department of Mechanical Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Yerim Kim
- Department of Mechanical Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Won Jun Chang
- Division of Materials Science and Engineering , Hanyang University , Seoul 04763 , Korea
| | - Peter M Knapp
- Department of Mechanical Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Michael Cai Wang
- Department of Mechanical Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Jin Myung Kim
- Department of Materials Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Narayana R Aluru
- Department of Mechanical Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Won Il Park
- Division of Materials Science and Engineering , Hanyang University , Seoul 04763 , Korea
| | - SungWoo Nam
- Department of Mechanical Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
- Department of Materials Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
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37
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Engineering N-reduced graphene oxide wrapped Co3O4@f-MWCNT hybrid for enhance performance dye-sensitized solar cells. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.05.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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38
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Nguyen NN, Lee HC, Kang B, Jo M, Cho K. Electric-Field-Tunable Growth of Organic Semiconductor Crystals on Graphene. NANO LETTERS 2019; 19:1758-1766. [PMID: 30747540 DOI: 10.1021/acs.nanolett.8b04764] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Growth of organic semiconductor thin films on a two-dimensional template is affected by its properties and is not well understood. This growth process dictates a thin film's final morphology and crystal structure and is controlled by the interactions between ad-molecules and the template. Here, we report that the template's charge density determines the tuning of such interactions. We observe the dependence of pentacene nucleation on charge carrier density ng in graphene under an applied electric field and contact-doping and then deduce that the interaction energy EA between the ad-molecule and the graphene is related linearly to ng. This tunability of EA allows control of the pentacene crystals growth. We exploit these findings to demonstrate that graphene, in which ng is controlled, can be used to template pentacene thin films for improved optoelectronic properties, such as electrical conductivity and exciton diffusion length.
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Affiliation(s)
- Nguyen Ngan Nguyen
- Department of Chemical Engineering , Pohang University of Science and Technology , Pohang 37673 , Korea
| | - Hyo Chan Lee
- Department of Chemical Engineering , Pohang University of Science and Technology , Pohang 37673 , Korea
| | - Boseok Kang
- Department of Chemical Engineering , Pohang University of Science and Technology , Pohang 37673 , Korea
| | - Mankyu Jo
- Department of Chemical Engineering , Pohang University of Science and Technology , Pohang 37673 , Korea
| | - Kilwon Cho
- Department of Chemical Engineering , Pohang University of Science and Technology , Pohang 37673 , Korea
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Feng J, Guo Z. Wettability of graphene: from influencing factors and reversible conversions to potential applications. NANOSCALE HORIZONS 2019; 4:339-364. [PMID: 32254088 DOI: 10.1039/c8nh00348c] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
As a member of the carbon material family, graphene has long been the focus of research on account of its abundant excellent properties. Nevertheless, many previous research works have attached much importance to its mechanical capacity and electrical properties, and not to its surface wetting properties with respect to water. In this review, a series of methods are put forward for characterization of the water contact angle of graphene, such as experimental measurements, classic molecular dynamics simulations, and formula calculations. A series of factors that affect the wettability of graphene, including defects, controllable atmosphere, doping, and electric field, are also discussed in detail, and have rarely have been covered in other review articles before. Finally, with the developments of smart surfaces, a reversible wettability variation of graphene from hydrophobic to hydrophilic is important in the presence of external stimulation and is discussed in detail herein. It is anticipated that graphene could serve as a tunable wettability coating for further developments in electronic devices and brings a new perspective to the construction of smart material surfaces.
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Affiliation(s)
- Jing Feng
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China
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Xu A, Shi L, Zeng L, Zhao T. First-principle investigations of nitrogen-, boron-, phosphorus-doped graphite electrodes for vanadium redox flow batteries. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.01.109] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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41
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Fan Z, Hu M, Liu J, Luo X, Zhang K, Tang Z. First-Principles Investigation of Adsorption of Ag on Defected and Ce-doped Graphene. MATERIALS 2019; 12:ma12040649. [PMID: 30795526 PMCID: PMC6416613 DOI: 10.3390/ma12040649] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 02/12/2019] [Accepted: 02/18/2019] [Indexed: 02/04/2023]
Abstract
To enhance the wettability between Ag atoms and graphene of graphene-reinforced silver-based composite filler, the adsorption behavior of Ag atoms on graphene was studied by first-principles calculation. This was based on band structure analysis, both p-type doping and n-type doping form, of the vacancy-defected and Ce-doped graphene. It was verified by the subsequent investigation on the density of states. According to the charge transfer calculation, p-type doping can promote the electron transport ability between Ag atoms and graphene. The adsorption energy and population analysis show that both defect and Ce doping can improve the wettability and stability of the Ag-graphene system. Seen from these theoretical calculations, this study provides useful guidance for the preparation of Ag-graphene composite fillers.
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Affiliation(s)
- Zhou Fan
- School of Materials Science and Engineering, University of Southwest Petroleum, Chengdu 610500, China.
| | - Min Hu
- School of Materials Science and Engineering, University of Southwest Petroleum, Chengdu 610500, China.
| | - Jianyi Liu
- State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Southwest Petroleum University, Chengdu 610500, China.
| | - Xia Luo
- School of Materials Science and Engineering, University of Southwest Petroleum, Chengdu 610500, China.
| | - Kun Zhang
- School of Materials Science and Engineering, University of Southwest Petroleum, Chengdu 610500, China.
| | - Zhengchao Tang
- School of Materials Science and Engineering, University of Southwest Petroleum, Chengdu 610500, China.
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Ångstrom-Scale, Atomically Thin 2D Materials for Corrosion Mitigation and Passivation. COATINGS 2019. [DOI: 10.3390/coatings9020133] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Metal deterioration via corrosion is a ubiquitous and persistent problem. Ångstrom-scale, atomically thin 2D materials are promising candidates for effective, robust, and economical corrosion passivation coatings due to their ultimate thinness and excellent mechanical and electrical properties. This review focuses on elucidating the mechanism of 2D materials in corrosion mitigation and passivation related to their physicochemical properties and variations, such as defects, out-of-plane deformations, interfacial states, temporal and thickness variations, etc. In addition, this review discusses recent progress and developments of 2D material coatings for corrosion mitigation and passivation as well as the significant challenges to overcome in the future.
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Chu ED, Wang PH, Hong YZ, Woon WY, Chiu HC. Frictional characteristics of nano-confined water mediated hole-doped single-layer graphene on silica surface. NANOTECHNOLOGY 2019; 30:045706. [PMID: 30479310 DOI: 10.1088/1361-6528/aaed5b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We have investigated the frictional properties of single-layer graphene (SLG) coated rough silica substrate under the influence of nano-confined hydration layer underneath SLG. Through the friction and surface potential measurements by atomic force microscopy (AFM), we found polygonal features in AFM images of SLG-protected silica surface that exhibit simultaneously larger friction and higher surface potential as compared to their surrounding areas due to water layers confined under SLG. Nano-confined water layers at the SLG-silica interface can induce the hole-doping effect in SLG, resulting in a more positively-charged and hydrophilic surface that favors adsorption of ambient water molecules. Therefore, during friction measurements, nanoscale capillary bridges can form within the interstices of AFM probe-SLG contact, leading to larger adhesion and friction. The friction forces were found to respectively have negative and positive dependence on the sliding velocity inside and outside the polygonal regions due to different surface wettability. Hence, it is possible to manipulate the frictional properties of SLG-coated silica by the amount of hydration layer confined underneath SLG. Our results may find applications in friction control for future nano-devices.
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Affiliation(s)
- En-De Chu
- Department of Physics, National Taiwan Normal University, Taipei, 11677 Taiwan
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Wang Z, Liu J, Hao X, Wang Y, Chen Y, Li P, Dong M. Investigating the stability of molecule doped graphene field effect transistors. NEW J CHEM 2019. [DOI: 10.1039/c9nj03537k] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electrical properties of PEI doped CVD-grown graphene transistors have been studied in detail, demonstrating that the absorbed PEI molecular will be modified by oxygen or water molecular during the exposure in ambient.
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Affiliation(s)
- Zegao Wang
- College of Materials Science and Engineering
- Sichuan University
- Chengdu 610065
- China
- Interdisciplinary Nanoscience Center
| | - Jingbo Liu
- Dongguan University of Technology
- School of Physics
- Dongguan
- China
| | - Xin Hao
- North Laser Research Institute Co. Ltd
- Chengdu
- China
| | - Yin Wang
- Interdisciplinary Nanoscience Center
- Aarhus University
- Aarhus 8000
- Denmark
| | - Yuanfu Chen
- State Key Laboratory of Electronic Thin Films and Integrated Devices
- University of Electronic Science and Technology of China
- Chengdu 610054
- China
| | - Pingjian Li
- State Key Laboratory of Electronic Thin Films and Integrated Devices
- University of Electronic Science and Technology of China
- Chengdu 610054
- China
| | - Mingdong Dong
- Interdisciplinary Nanoscience Center
- Aarhus University
- Aarhus 8000
- Denmark
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Hersey M, Berger SN, Holmes J, West A, Hashemi P. Recent Developments in Carbon Sensors for At-Source Electroanalysis. Anal Chem 2018; 91:27-43. [PMID: 30481001 DOI: 10.1021/acs.analchem.8b05151] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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46
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Choi JIJ, Kim JJ, Oh W, Doh WH, Park JY. Ambient-pressure atomic force microscope with variable pressure from ultra-high vacuum up to one bar. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:103701. [PMID: 30399693 DOI: 10.1063/1.5042076] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 09/21/2018] [Indexed: 06/08/2023]
Abstract
We present the design and performance of an ambient-pressure atomic force microscope (AP-AFM) that allows AFM measurements using the laser deflection technique in a highly controlled environment from ultra-high vacuum (UHV) up to 1 bar with various gases. While the UHV of the AP-AFM system is obtained by a combination of turbo-molecular and ion pumps, for the higher-pressure studies, the ambient-pressure chamber is isolated from the pumps and high-purity gases are dosed via a leak valve from a gas manifold. The AP-AFM system, therefore, provides versatile AFM techniques, including the measurement of topography, friction and local conductance mapping, and force spectroscopy in a highly controlled environment with pressures ranging from UHV up to atmospheric pressure. Atomically resolved stick-slip images and force spectroscopy of highly ordered pyrolytic graphite (HOPG) at variable pressure conditions are presented to demonstrate the performance of the AP-AFM system. Force spectroscopy results of vacuum-cleaved HOPG, followed by exposure to lab air, oxygen, and methane show that adhesion between the AFM tip and the HOPG depends significantly on the exposed gas and pressure. Our results show that the deposition of airborne hydrocarbon impurities at ambient conditions leads to a significant change in adhesion force, implying that the wettability of the HOPG surface depends on the environment and the pressure.
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Affiliation(s)
- Joong Il Jake Choi
- Graduate School of EEWS and Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
| | - Jeong Jin Kim
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Daejeon 34141, South Korea
| | - Wooseok Oh
- Graduate School of EEWS and Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
| | - Won Hui Doh
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Daejeon 34141, South Korea
| | - Jeong Young Park
- Graduate School of EEWS and Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
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Wang M, Yu H, Ma X, Yao Y, Wang L, Liu L, Cao K, Liu S, Dong C, Zhao B, Song C, Chen S, Huang W. Copper oxide-modified graphene anode and its application in organic photovoltaic cells. OPTICS EXPRESS 2018; 26:A769-A776. [PMID: 30184836 DOI: 10.1364/oe.26.00a769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 06/24/2018] [Indexed: 06/08/2023]
Abstract
Graphene is an ideal substitute for indium tin oxide electrode in organic photovoltaic (OPV) devices, due to its outstanding electrical, optical, chemical and mechanical properties. However, the graphene electrode suffers from work function mismatch with common hole injection layer and intrinsic hydrophobic property. Here, CuxO is proposed to modify monolayer graphene in order to increase the work function of graphene (from 4.45 to 4.76 eV) and decrease the water contact angle (from 88° to 59°). Then, the OPV devices based on the CuxO modified graphene anode are fabricated successfully, and power conversion efficiency (PCE) is enhanced from 4.00 ± 0.44 to 5.23 ± 0.47%. Furthermore, the ternary blended polymer solar cell is fabricated by adding a small molecular material 1, 2, 5-thiadiazole-fused 12-ring polyaromatic hydrocarbon into the active layer, and the PCE is improved to 6.03 ± 0.53%, due to the enhanced absorption and depressed recombination inside the active layer.
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Perumal S, Raji A, Cheong IW. Interaction of Zwitterionic and Ionic Monomers with Graphene Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:6737-6747. [PMID: 29791160 DOI: 10.1021/acs.langmuir.8b00975] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Measurement of the interaction force between two materials provides important information on various properties, such as adsorption, binding, or compatibility for coatings, adhesion, and composites. The interaction forces of zwitterionic and ionic monomers with graphite platelets (G) and reduced graphene oxide (rGO) surfaces were systematically investigated by atomic force microscopy (AFM) in air and water. The monomers examined were 2-(methacryloyloxy)ethyl 2-(trimethylammonio)ethyl phosphate (MPC), [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide (SBE), [2-(acryloyloxy)ethyl]trimethylammonium chloride (ATC), and 2-methyl-2-propene-1-sulfonic acid sodium (MSS). The AFM studies revealed that MSS and SBE monomers with sulfonate units have stronger interaction forces with G surface in air and that MPC and ATC monomers with quaternary ammonium units have higher interaction forces in water. In the case of rGO surface, the monomers with quaternary ammonium units showed stronger interactions regardless of the medium. These interactions could be rationalized by the interaction mechanism between the monomers with graphene surfaces, such as cation-π for MPC and ATC and anion-π for MSS and SBE. Overall, cation-π interactions were effective in water, whereas anion-π interactions are effective in air with G surface. The adhesion values of MPC, SBE, ATC, and MSS on rGO were lower than the values measured on G surface. Among the monomers, MPC showed the highest dispersibility for aqueous graphene dispersions. Further, the adsorption of MPC on G and rGO surfaces was verified by high-resolution transmission electron microscopy and X-ray diffraction patterns.
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Affiliation(s)
| | - Atchudan Raji
- School of Chemical Engineering , Yeungnam University , Gyeongsan 38541 , Republic of Korea
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Ohto T, Tada H, Nagata Y. Structure and dynamics of water at water-graphene and water-hexagonal boron-nitride sheet interfaces revealed by ab initio sum-frequency generation spectroscopy. Phys Chem Chem Phys 2018; 20:12979-12985. [PMID: 29707716 DOI: 10.1039/c8cp01351a] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We simulate sum-frequency generation (SFG) spectra of isotopically diluted water at the water-graphene and water-hexagonal boron-nitride (hBN) sheet interfaces, using ab initio molecular dynamics simulations. A sharp 'dangling' O-D peak around ∼2640 cm-1 appearing in both simulated SFG spectra evidences that both graphene and hBN are hydrophobic. The dangling O-D peak is 10 cm-1 red-shifted at the water-hBN interface relative to the peak at the water-graphene interface. This frequency difference gives a stronger O-DN intermolecular interaction between water and hBN than the O-DC interaction between water and graphene. Accordingly, the anisotropy decay of such a dangling O-D group slows down near hBN compared with near graphene, illustrating that the dynamics of the dangling O-D group are also affected by the stronger O-DN interaction than the O-DC interaction. We discuss molecular-level insights into the structure and dynamics of interfacial water in the context of the friction of hBN and graphene.
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Affiliation(s)
- Tatsuhiko Ohto
- Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan.
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Yao J, Zhang K, Wang W, Zuo X, Yang Q, Tang H, Wu M, Li G. Functional integration and self-template synthesis of hollow core-shell carbon mesoporous spheres/Fe 3O 4/nitrogen-doped graphene to enhance catalytic activity in DSSCs. NANOSCALE 2018; 10:7946-7956. [PMID: 29676411 DOI: 10.1039/c8nr01095a] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Excellent corrosion resistance is crucial for photovoltaic devices to acquire high and stable performance under high corrosive complicated environments. Creative inspiration comes from sandwich construction, whereby Fe3O4 nanoparticles were anchored onto hollow core-shell carbon mesoporous microspheres and wrapped by N-graphene nanosheets (HCCMS/Fe3O4@N-RGO) to obtain integrated high corrosive resistance and stability. The as-prepared multiple composite material possesses outstanding performance as a result of structure optimization, performance improvement, and interface synergy. Therefore, it can effectively suppress corrosion from the electrolyte in recycled tests many times, indicating the ultrahigh corrosion resistance life of this double carbon-based nanocomposite. Furthermore, the electrical conductivity and conversion efficiency of the composite are well maintained due to the triple synergistic interactions, which could serve as a guideline in establishing high-performance multifunctional HCCMS/Fe3O4@N-RGO with great prospects in energy devices, such as lithium batteries, supercapacitors and electrode materials, etc.
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Affiliation(s)
- Jixin Yao
- School of Physics and Materials Science, Anhui University, Hefei 230601, China.
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