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Yang M, Pártay LB, Wexler RB. Surface phase diagrams from nested sampling. Phys Chem Chem Phys 2024; 26:13862-13874. [PMID: 38659377 DOI: 10.1039/d4cp00050a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2024]
Abstract
Studies in atomic-scale modeling of surface phase equilibria often focus on temperatures near zero Kelvin due to the challenges in calculating the free energy of surfaces at finite temperatures. The Bayesian-inference-based nested sampling (NS) algorithm allows for modeling phase equilibria at arbitrary temperatures by directly and efficiently calculating the partition function, whose relationship with free energy is well known. This work extends NS to calculate adsorbate phase diagrams, incorporating all relevant configurational contributions to the free energy. We apply NS to the adsorption of Lennard-Jones (LJ) gas particles on low-index and vicinal LJ solid surfaces and construct the canonical partition function from these recorded energies to calculate ensemble averages of thermodynamic properties, such as the constant-volume heat capacity and order parameters that characterize the structure of adsorbate phases. Key results include determining the nature of phase transitions of adsorbed LJ particles on flat and stepped LJ surfaces, which typically feature an enthalpy-driven condensation at higher temperatures and an entropy-driven reordering process at lower temperatures, and the effect of surface geometry on the presence of triple points in the phase diagrams. Overall, we demonstrate the ability and potential of NS for surface modeling.
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Affiliation(s)
- Mingrui Yang
- Department of Chemistry and Institute of Materials Science and Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA.
| | - Livia B Pártay
- Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK
| | - Robert B Wexler
- Department of Chemistry and Institute of Materials Science and Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA.
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2
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Noordhoek K, Bartel CJ. Accelerating the prediction of inorganic surfaces with machine learning interatomic potentials. NANOSCALE 2024. [PMID: 38470833 DOI: 10.1039/d3nr06468a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/14/2024]
Abstract
The surface properties of solid-state materials often dictate their functionality, especially for applications where nanoscale effects become important. The relevant surface(s) and their properties are determined, in large part, by the material's synthesis or operating conditions. These conditions dictate thermodynamic driving forces and kinetic rates responsible for yielding the observed surface structure and morphology. Computational surface science methods have long been applied to connect thermochemical conditions to surface phase stability, particularly in the heterogeneous catalysis and thin film growth communities. This review provides a brief introduction to first-principles approaches to compute surface phase diagrams before introducing emerging data-driven approaches. The remainder of the review focuses on the application of machine learning, predominantly in the form of learned interatomic potentials, to study complex surfaces. As machine learning algorithms and large datasets on which to train them become more commonplace in materials science, computational methods are poised to become even more predictive and powerful for modeling the complexities of inorganic surfaces at the nanoscale.
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Affiliation(s)
- Kyle Noordhoek
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN, 55455, USA.
| | - Christopher J Bartel
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN, 55455, USA.
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3
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Lozano MS, Bernat-Montoya I, Angelova TI, Mojena AB, Díaz-Fernández FJ, Kovylina M, Martínez A, Cienfuegos EP, Gómez VJ. Plasma-Induced Surface Modification of Sapphire and Its Influence on Graphene Grown by Plasma-Enhanced Chemical Vapour Deposition. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1952. [PMID: 37446468 DOI: 10.3390/nano13131952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 06/22/2023] [Accepted: 06/26/2023] [Indexed: 07/15/2023]
Abstract
In this work, we study the influence of the different surface terminations of c-plane sapphire substrates on the synthesis of graphene via plasma-enhanced chemical vapor deposition. The different terminations of the sapphire surface are controlled by a plasma process. A design of experiments procedure was carried out to evaluate the major effects governing the plasma process of four different parameters: i.e., discharge power, time, pressure and gas employed. In the characterization of the substrate, two sapphire surface terminations were identified and characterized by means of contact angle measurements, being a hydrophilic (hydrophobic) surface and the fingerprint of an Al- (OH-) terminated surface, respectively. The defects within the synthesized graphene were analyzed by Raman spectroscopy. Notably, we found that the ID/IG ratio decreases for graphene grown on OH-terminated surfaces. Furthermore, two different regimes related to the nature of graphene defects were identified and, depending on the sapphire terminated surface, are bound either to vacancy or boundary-like defects. Finally, studying the density of defects and the crystallite area, as well as their relationship with the sapphire surface termination, paves the way for increasing the crystallinity of the synthesized graphene.
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Affiliation(s)
- Miguel Sinusia Lozano
- Nanophotonics Technology Center (NTC), Universitat Politècnica de València, 46022 Valencia, Spain
| | - Ignacio Bernat-Montoya
- Nanophotonics Technology Center (NTC), Universitat Politècnica de València, 46022 Valencia, Spain
| | - Todora Ivanova Angelova
- Nanophotonics Technology Center (NTC), Universitat Politècnica de València, 46022 Valencia, Spain
| | - Alberto Boscá Mojena
- Institute of Optoelectronic Systems and Microtechnology (ISOM), Universidad Politécnica de Madrid, 28040 Madrid, Spain
| | | | - Miroslavna Kovylina
- Nanophotonics Technology Center (NTC), Universitat Politècnica de València, 46022 Valencia, Spain
| | - Alejandro Martínez
- Nanophotonics Technology Center (NTC), Universitat Politècnica de València, 46022 Valencia, Spain
| | - Elena Pinilla Cienfuegos
- Nanophotonics Technology Center (NTC), Universitat Politècnica de València, 46022 Valencia, Spain
| | - Víctor J Gómez
- Nanophotonics Technology Center (NTC), Universitat Politècnica de València, 46022 Valencia, Spain
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4
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Hu M, Luo Y, Wei G, Gao LY, Cao ZQ, Zhang HY. Adsorption of HF and H 2S on α-Al 2O 3 (0001) Surfaces: A DFT Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:6399-6405. [PMID: 37105949 DOI: 10.1021/acs.langmuir.2c03411] [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
Ex-service SF6 adsorbents in SF6 gas-insulated electric equipment contain many toxic substances. Inside, HF and H2S are two typical toxic gases. Based on the first principle, the interaction process between HF/H2S and α-Al2O3 (0001) surfaces was calculated using the density functional theory (DFT). The results showed that the adsorption of HF on α-Al2O3 (0001) is stronger than that of H2S. Under the five adsorption sites, the adsorption effect of HF-H and HF-F was similar. At O-2 site, the adsorption energy of H2S-H adsorption configuration is significantly higher than that of the other four sites. The density of states (DOS) indicated that new peaks appeared after adsorption. The DOS and partial density of states (PDOS) indicated that the adsorption of HF and H2S occurs via chemical adsorption. The DOS and PDOS shifted to the right when the S atom was approaching, proving that the system shifts to instability. Compared with the energy gap of α-Al2O3 (0001), HF and H2S adsorption systems decreased significantly. The energy gap of the HF adsorption system was 1.173 eV larger than that of the H2S system and the geometry was relatively stable, which is consistent with the DOS and PDOS adsorption calculation results. Thus, the adsorption of HF and H2S on α-Al2O3 (0001) surfaces was clearly different. The findings of this study may provide theoretical guidance for the adsorption of other gases or developing a new adsorbent.
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Affiliation(s)
- Min Hu
- College of Electrical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
| | - Yao Luo
- College of Electrical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
| | - Gang Wei
- College of Electrical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
| | - Ling-Yun Gao
- Process Technology and Intelligent Manufacturing Department, Manufacture Company, China National Logging Corporation, Xian 710076, China
| | - Zheng-Qin Cao
- College of Electrical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
| | - Hai-Yan Zhang
- College of Electrical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
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5
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Gao Y, He X, Mao K, Russell CK, Toan S, Wang A, Chien T, Cheng F, Russell AG, Zeng XC, Fan M. Catalytic CO 2 Capture via Ultrasonically Activating Dually Functionalized Carbon Nanotubes. ACS NANO 2023; 17:8345-8354. [PMID: 37075195 DOI: 10.1021/acsnano.2c12762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
High energy consumption and high cost have been the obstacles for large-scale deployment of all state-of-the-art CO2 capture technologies. Finding a transformational way to improve mass transfer and reaction kinetics of the CO2 capture process is timely for reducing carbon footprints. In this work, commercial single-walled carbon nanotubes (CNTs) were activated with nitric acid and urea under ultrasonication and hydrothermal methods, respectively, to prepare N-doped CNTs with the functional group of -COOH, which possesses both basic and acid functionalities. The chemically modified CNTs with a concentration of 300 ppm universally catalyze both CO2 sorption and desorption of the CO2 capture process. The increases in the desorption rate achieved with the chemically modified CNTs can reach as high as 503% compared to that of the sorbent without the catalyst. A chemical mechanism underlying the catalytic CO2 capture is proposed based on the experimental results and further confirmed by density functional theory computations.
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Affiliation(s)
- Yangyan Gao
- Departments of Chemical and Petroleum Engineering, University of Wyoming, Laramie, Wyoming 82071, United States
- College of Environmental & Resource Sciences, Shanxi University, Taiyuan, Shanxi 030001, P.R. China
| | - Xin He
- Departments of Chemical and Petroleum Engineering, University of Wyoming, Laramie, Wyoming 82071, United States
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, P.R. China
| | - Keke Mao
- School of Energy and Environment, Anhui University of Technology, Maanshan, Anhui 243032, P.R. China
| | - Christopher K Russell
- Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Sam Toan
- Department of Chemical Engineering, University of Minnesota, Duluth, Minnesota 55812, United States
| | - Aron Wang
- Department of Physics & Astronomy, University of Wyoming, Laramie, Wyoming 82071, United States
| | - TeYu Chien
- Department of Physics & Astronomy, University of Wyoming, Laramie, Wyoming 82071, United States
| | - Fangqin Cheng
- College of Environmental & Resource Sciences, Shanxi University, Taiyuan, Shanxi 030001, P.R. China
| | - Armistead G Russell
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Xiao Cheng Zeng
- Department of Materials Science & Engineering, City University of Hong Kong, Kowloon 999077, Hong Kong
- Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588, United States
| | - Maohong Fan
- Departments of Chemical and Petroleum Engineering, University of Wyoming, Laramie, Wyoming 82071, United States
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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6
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Fu X. Nanostructure, Plastic Deformation, and Influence of Strain Rate Concerning Ni/Al 2O 3 Interface System Using a Molecular Dynamic Study (LAMMPS). NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:641. [PMID: 36839008 PMCID: PMC9967036 DOI: 10.3390/nano13040641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 01/31/2023] [Accepted: 02/02/2023] [Indexed: 06/18/2023]
Abstract
The plastic deformation mechanisms of Ni/Al2O3 interface systems under tensile loading at high strain rates were investigated by the classical molecular dynamics (MD) method. A Rahman-Stillinger-Lemberg potential was used for modeling the interaction between Ni and Al atoms and between Ni and O atoms at the interface. To explore the dislocation nucleation and propagation mechanisms during interface tensile failure, two kinds of interface structures corresponding to the terminating Ni layer as buckling layer (Type I) and transition layer (Type II) were established. The fracture behaviors show a strong dependence on interface structure. For Type I interface samples, the formation of Lomer-Cottrell locks in metal causes strain hardening; for Type II interface samples, the yield strength is 40% higher than that of Type I due to more stable Ni-O bonds at the interface. At strain rates higher than 1×109 s-1, the formation of L-C locks in metal is suppressed (Type I), and the formation of Shockley dislocations at the interface is delayed (Type II). The present work provides the direct observation of nucleation, motion, and reaction of dislocations associated with the complex interface dislocation structures of Ni/Al2O3 interfaces and can help researchers better understand the deformation mechanisms of this interface at extreme conditions.
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Affiliation(s)
- Xueqiong Fu
- Shenzhen Institute of Advanced Electronic Materials, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
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7
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Park Y, Ahn C, Ahn JG, Kim JH, Jung J, Oh J, Ryu S, Kim S, Kim SC, Kim T, Lim H. Critical Role of Surface Termination of Sapphire Substrates in Crystallographic Epitaxial Growth of MoS 2 Using Inorganic Molecular Precursors. ACS NANO 2023; 17:1196-1205. [PMID: 36633192 DOI: 10.1021/acsnano.2c08983] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
A highly reproducible route for the epitaxial growth of single-crystalline monolayer MoS2 on a C-plane sapphire substrate was developed using vapor-pressure-controllable inorganic molecular precursors MoOCl4 and H2S. Microscopic, crystallographic, and spectroscopic analyses indicated that the epitaxial MoS2 film possessed outstanding electrical and optical properties, excellent homogeneity, and orientation selectivity. The systematic investigation of the effect of growth temperature on the crystallographic orientations of MoS2 revealed that the surface termination of the sapphire substrate with respect to the growth temperature determines the crystallographic orientation selectivity of MoS2. Our results suggest that controlling the surface to form a half-Al-terminated surface is a prerequisite for the epitaxial growth of MoS2 on a C-plane sapphire substrate. The insights on the growth mechanism, especially the significance of substrate surface termination, obtained through this study will aid in designing efficient epitaxial growth routes for developing single-crystalline monolayer transition metal dichalcogenides.
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Affiliation(s)
- Younghee Park
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju61005, Republic of Korea
| | - Chaehyeon Ahn
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju61005, Republic of Korea
| | - Jong-Guk Ahn
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju61005, Republic of Korea
| | - Jee Hyeon Kim
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju61005, Republic of Korea
| | - Jaehoon Jung
- Department of Chemistry, University of Ulsan, Ulsan44776, Republic of Korea
| | - Juseung Oh
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang37673, Republic of Korea
| | - Sunmin Ryu
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang37673, Republic of Korea
| | - Soyoung Kim
- Analysis and Assessment Group, Research Institute of Industrial Science and Technology, Pohang37673, Republic of Korea
| | - Seung Cheol Kim
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju61005, Republic of Korea
| | - Taewoong Kim
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju61005, Republic of Korea
| | - Hyunseob Lim
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju61005, Republic of Korea
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8
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Jin H, Zhang J, Li P, Zhang Y, Zhang W, Qin J, Wang L, Long H, Li W, Shao R, Ma E, Zhang Z, Han X. Atomistic mechanism of phase transformation between topologically close-packed complex intermetallics. Nat Commun 2022; 13:2487. [PMID: 35513380 PMCID: PMC9072387 DOI: 10.1038/s41467-022-30040-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Accepted: 03/28/2022] [Indexed: 11/18/2022] Open
Abstract
Understanding how topologically close-packed phases (TCPs) transform between one another is one of the challenging puzzles in solid-state transformations. Here we use atomic-resolved tools to dissect the transition among TCPs, specifically the μ and P (or σ) phases in nickel-based superalloys. We discover that the P phase originates from intrinsic (110) faulted twin boundaries (FTB), which according to first-principles calculations is of extraordinarily low energy. The FTB sets up a pathway for the diffusional in-flux of the smaller 3d transition metal species, creating a Frank interstitial dislocation loop. The climb of this dislocation, with an unusual Burgers vector that displaces neighboring atoms into the lattice positions of the product phase, accomplishes the structural transformation. Our findings reveal an intrinsic link among these seemingly unrelated TCP configurations, explain the role of internal lattice defects in facilitating the phase transition, and offer useful insight for alloy design that involves different complex phases. It is challenging to study how topologically close-packed phases (TCPs) transform between one phase to another. Here the authors use atomic-resolved tools to look at the transformation between μ and P phases, revealing an intrinsic link between seemingly unrelated TCP configurations.
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Affiliation(s)
- Huixin Jin
- Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China.,School of Materials Science & Engineering, Shandong University, Jinan, 250061, China.,Center for Alloy Innovation and Design (CAID), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China.,School of Materials Science & Engineering, Zhejiang University, Hangzhou, 310058, China.,Beijing Advanced Innovation Center for Intelligent Robots and Systems and Institute of Engineering Medicine, Beijing Institute of Technology, Beijing, 100081, China
| | - Jianxin Zhang
- School of Materials Science & Engineering, Shandong University, Jinan, 250061, China.
| | - Pan Li
- School of Materials Science & Engineering, Shandong University, Jinan, 250061, China.,Institute of Systems Engineering, AMS, PLA, Beijing, 100000, China
| | - Youjian Zhang
- School of Materials Science & Engineering, Shandong University, Jinan, 250061, China.,Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing, Yantai, 264006, P. R. China
| | - Wenyang Zhang
- School of Materials Science & Engineering, Shandong University, Jinan, 250061, China
| | - Jingyu Qin
- School of Materials Science & Engineering, Shandong University, Jinan, 250061, China
| | - Lihua Wang
- Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China
| | - Haibo Long
- Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China
| | - Wei Li
- Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China
| | - Ruiwen Shao
- Beijing Advanced Innovation Center for Intelligent Robots and Systems and Institute of Engineering Medicine, Beijing Institute of Technology, Beijing, 100081, China
| | - En Ma
- Center for Alloy Innovation and Design (CAID), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China.
| | - Ze Zhang
- Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China.,School of Materials Science & Engineering, Zhejiang University, Hangzhou, 310058, China
| | - Xiaodong Han
- Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China.
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9
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Liu Z, Liu B, Ren F, Yin Y, Zhang S, Liang M, Dou Z, Liu Z, Yang S, Yan J, Wei T, Yi X, Wu C, Guo T, Wang J, Zhang Y, Li J, Gao P. Atomic-Scale Mechanism of Spontaneous Polarity Inversion in AlN on Nonpolar Sapphire Substrate Grown by MOCVD. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2200057. [PMID: 35142049 DOI: 10.1002/smll.202200057] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 01/29/2022] [Indexed: 06/14/2023]
Abstract
The performance of nitride devices is strongly affected by their polarity. Understanding the polarity determination and evolution mechanism of polar wurtzite nitrides on nonpolar substrates is therefore critically important. This work confirms that the polarity of AlN on sapphire prepared by metal-organic chemical vapor deposition is not inherited from the nitrides/sapphire interface as widely accepted, instead, experiences a spontaneous polarity inversion during the growth. It is found that at the initial growth stage, the interface favors the nitrogen-polarity, rather than the widely accepted metal-polarity or randomly coexisting. However, the polarity subsequently converts into the metal-polar situation, at first locally then expanding into the whole area, driven by the anisotropy of surface energies, which results in universally existing inherent inverse grain boundaries. Furthermore, vertical two-dimensional electron accumulation originating from the lattice symmetry breaking at the inverse grain boundary is first revealed. This work identifies another cause of high-density defects in nitride epilayers, besides lattice mismatch induced dislocations. These findings also offer new insights into atomic structure and determination mechanism of polarity in nitrides, providing clues for its manipulation toward the novel hetero-polarity devices.
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Affiliation(s)
- Zhiqiang Liu
- Research and Development Center for Semiconductor Lighting Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Bingyao Liu
- Electron Microscopy Laboratory, and International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China
- Beijing Graphene Institute (BGI), Beijing, 100095, China
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871, China
| | - Fang Ren
- Research and Development Center for Semiconductor Lighting Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yue Yin
- Research and Development Center for Semiconductor Lighting Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Shuo Zhang
- Research and Development Center for Semiconductor Lighting Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Meng Liang
- Research and Development Center for Semiconductor Lighting Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhipeng Dou
- Electron Microscopy Laboratory, and International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China
- Beijing Graphene Institute (BGI), Beijing, 100095, China
| | - Zhetong Liu
- Electron Microscopy Laboratory, and International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China
- Beijing Graphene Institute (BGI), Beijing, 100095, China
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871, China
| | - Shenyuan Yang
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
- State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China
| | - Jianchang Yan
- Research and Development Center for Semiconductor Lighting Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Tongbo Wei
- Research and Development Center for Semiconductor Lighting Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiaoyan Yi
- Research and Development Center for Semiconductor Lighting Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Chaoxing Wu
- College of Physics and Information Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Tailiang Guo
- College of Physics and Information Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Junxi Wang
- Research and Development Center for Semiconductor Lighting Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yong Zhang
- Department of Electrical and Computer Engineering, The University of North Carolina at Charlotte, Charlotte, NC, 28223, USA
| | - Jinmin Li
- Research and Development Center for Semiconductor Lighting Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Peng Gao
- Electron Microscopy Laboratory, and International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China
- Beijing Graphene Institute (BGI), Beijing, 100095, China
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871, China
- Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China
- Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Peking University, Beijing, 100871, China
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10
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Cantarelli C, Darenne B, Alves Fortunato M, de Bruin T, Costa D. DFT screening of adsorption of biodiesel molecules on aluminum and stainless steel surfaces. RESULTS IN SURFACES AND INTERFACES 2022. [DOI: 10.1016/j.rsurfi.2022.100050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Ahmad A, Martsinovich N. Modelling the strength of mineral–organic binding: organic molecules on the α-Al 2O 3(0001) surface. RSC Adv 2022; 12:27604-27615. [PMID: 36276046 PMCID: PMC9514380 DOI: 10.1039/d2ra04742j] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 09/17/2022] [Indexed: 11/26/2022] Open
Abstract
Organic carbon (OC) is an essential component of soil. Sorption of OC to oxide mineral surfaces is a key process in soil preservation due to its ability to protect OC from microbial degradation. To understand the sorption of OC in soils and obtain a quantitative description of the binding of organic molecules to soil minerals, we investigated the binding of water and small organic molecules, typical building blocks of OC, on α-Al2O3, a common soil mineral. α-Al2O3 was modelled using (0001)-oriented periodic slabs, using density functional theory calculations with empirical dispersion correction. For water, dissociative adsorption was energetically preferred to molecular adsorption. Amine, amide and carboxylic acid functional groups were found to bind more strongly to this surface compared to water. Alcohol, ether, thiol and ester functional groups had adsorption energies very similar to that of water, while hydrocarbons were found to bind less strongly. Carboxylic acids were the strongest bound surface adsorbates in this study. Dissociated adsorption configurations (where allowed by the molecules' chemical nature) were usually more favourable than molecular adsorption. Hydrogen bonding was found to be a major contributor to the stability of adsorption configurations. This work shows that a number of organic functional groups, in particular amine, amide and carboxylic acids, bind to the α-Al2O3(0001) surface more strongly than water; thus they are likely to be adsorbed on this mineral surface under ambient conditions and to provide stability of adsorbed OC. We evaluated the stability of organic molecules in soil by calculating these molecules' strength of adsorption on the α-Al2O3 mineral.![]()
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Affiliation(s)
- Aneesa Ahmad
- Department of Chemistry, University of Sheffield, UK
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12
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Abbaspour Tamijani A, Augustine LJ, Bjorklund JL, Catalano JG, Mason SE. First-principles characterisation and comparison of clean, hydrated, and defect α-Al2O3 and α-Fe2O3 (110) surfaces. MOLECULAR SIMULATION 2021. [DOI: 10.1080/08927022.2021.2009117] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
| | | | | | - Jeffrey G. Catalano
- Department of Earth and Planetary Sciences, Washington University, St. Louis, USA
| | - Sara E. Mason
- Department of Chemistry, University of Iowa, Iowa City, USA
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13
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Chen Z, Xie C, Wang W, Zhao J, Liu B, Shan J, Wang X, Hong M, Lin L, Huang L, Lin X, Yang S, Gao X, Zhang Y, Gao P, Novoselov KS, Sun J, Liu Z. Direct growth of wafer-scale highly oriented graphene on sapphire. SCIENCE ADVANCES 2021; 7:eabk0115. [PMID: 34797705 PMCID: PMC8604399 DOI: 10.1126/sciadv.abk0115] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Direct chemical vapor deposition (CVD) growth of wafer-scale high-quality graphene on dielectrics is of paramount importance for versatile applications. Nevertheless, the synthesized graphene is typically a polycrystalline film with high density of uncontrolled defects, resulting in a low carrier mobility and high sheet resistance. Here, we report the direct growth of highly oriented monolayer graphene films on sapphire wafers. Our growth strategy is achieved by designing an electromagnetic induction heating CVD operated at elevated temperature, where the high pyrolysis and migration barriers of carbon species are easily overcome. Meanwhile, the embryonic graphene domains are guided into good alignment by minimizing its configuration energy. The thus obtained graphene film accordingly manifests a markedly improved carrier mobility (~14,700 square centimeters per volt per second at 4 kelvin) and reduced sheet resistance (~587 ohms per square), which compare favorably with those from catalytic growth on polycrystalline metal foils and epitaxial growth on silicon carbide.
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Affiliation(s)
- Zhaolong Chen
- Center for Nanochemistry (CNC), Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
- Beijing Graphene Institute (BGI), Beijing 100095, China
- Institute for Functional Intelligent Materials, National University of Singapore, Singapore 117575, Singapore
| | - Chunyu Xie
- Center for Nanochemistry (CNC), Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
| | - Wendong Wang
- School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK
| | - Jinpei Zhao
- Department of Physics, National University of Singapore, Singapore 117551, Singapore
| | - Bingyao Liu
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
- Electron Microscopy Laboratory and International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
| | - Jingyuan Shan
- Center for Nanochemistry (CNC), Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
- Beijing Graphene Institute (BGI), Beijing 100095, China
| | - Xueyan Wang
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Min Hong
- Center for Nanochemistry (CNC), Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
| | - Li Lin
- Institute for Functional Intelligent Materials, National University of Singapore, Singapore 117575, Singapore
| | - Li Huang
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Xiao Lin
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Shenyuan Yang
- State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
- Corresponding author. (S.Y.); (Y.Z.); (P.G.); (K.S.N.); (J.S.); (Z.L.)
| | - Xuan Gao
- Beijing Graphene Institute (BGI), Beijing 100095, China
| | - Yanfeng Zhang
- Center for Nanochemistry (CNC), Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
- Beijing Graphene Institute (BGI), Beijing 100095, China
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
- Corresponding author. (S.Y.); (Y.Z.); (P.G.); (K.S.N.); (J.S.); (Z.L.)
| | - Peng Gao
- Beijing Graphene Institute (BGI), Beijing 100095, China
- Electron Microscopy Laboratory and International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
- Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Peking University, Beijing 100871,China
- Corresponding author. (S.Y.); (Y.Z.); (P.G.); (K.S.N.); (J.S.); (Z.L.)
| | - Kostya S. Novoselov
- Institute for Functional Intelligent Materials, National University of Singapore, Singapore 117575, Singapore
- Chongqing 2D Materials Institute, Liangjiang New Area, Chongqing 400714, China
- Corresponding author. (S.Y.); (Y.Z.); (P.G.); (K.S.N.); (J.S.); (Z.L.)
| | - Jingyu Sun
- Beijing Graphene Institute (BGI), Beijing 100095, China
- College of Energy, Soochow Institute for Energy and Materials Innovations (SIEMIS), Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
- Corresponding author. (S.Y.); (Y.Z.); (P.G.); (K.S.N.); (J.S.); (Z.L.)
| | - Zhongfan Liu
- Center for Nanochemistry (CNC), Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
- Beijing Graphene Institute (BGI), Beijing 100095, China
- Corresponding author. (S.Y.); (Y.Z.); (P.G.); (K.S.N.); (J.S.); (Z.L.)
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14
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Chizallet C, Schlaup C, Fonda E, Carrier X. Surface orientation dependent interaction of cobalt (II) precursors with alpha-alumina. J Catal 2021. [DOI: 10.1016/j.jcat.2020.10.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Zhu Z, Yu Z, Yun FF, Pan D, Tian Y, Jiang L, Wang X. Crystal face dependent intrinsic wettability of metal oxide surfaces. Natl Sci Rev 2021; 8:nwaa166. [PMID: 34691554 PMCID: PMC8288373 DOI: 10.1093/nsr/nwaa166] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 07/06/2020] [Accepted: 07/12/2020] [Indexed: 01/10/2023] Open
Abstract
Knowledge of intrinsic wettability at solid/liquid interfaces at the molecular level perspective is significant in understanding crucial progress in some fields, such as electrochemistry, molecular biology and earth science. It is generally believed that surface wettability is determined by the surface chemical component and surface topography. However, when taking molecular structures and interactions into consideration, many intriguing phenomena would enrich or even redress our understanding of surface wettability. From the perspective of interfacial water molecule structures, here, we discovered that the intrinsic wettability of crystal metal oxide is not only dependent on the chemical components but also critically dependent on the crystal faces. For example, the [Formula: see text] crystal face of α-Al2O3 is intrinsically hydrophobic with a water contact angle near 90°, while another three crystal faces are intrinsically hydrophilic with water contact angles <65°. Based on surface energy analysis, it is found that the total surface energy, polar component and Lewis base portion of the hydrophobic crystal face are all smaller than the other three hydrophilic crystal faces indicating that they have different surface states. DFT simulation further revealed that the adsorbed interfacial water molecules on each crystal face hold various orientations. Herein, the third crucial factor for surface wettability from the perspective of the molecular level is presented, that is the orientations of adsorbed interfacial water molecules apart from the macro-level chemical component and surface topography. This study may serve as a source of inspiration for improving wetting theoretical models and designing controllable wettability at the molecular/atomic level.
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Affiliation(s)
- Zhongpeng Zhu
- Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, China
| | - Zhenwei Yu
- Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, Wollongong, NSW 2500, Australia
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, China
| | - Frank F Yun
- Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, Wollongong, NSW 2500, Australia
| | - Deng Pan
- Jinan Yian Biology Institute, Shandong Yian Biological Engineering Co. Ltd., Jinan 250100, China
| | - Ye Tian
- Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lei Jiang
- Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaolin Wang
- Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, Wollongong, NSW 2500, Australia
- ARC Centre of Excellence for Future Low-Energy Electronics Technologies (FLEET), University of Wollongong, North Wollongong, NSW 2522, Australia
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16
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Tamijani AA, Bjorklund JL, Augustine LJ, Catalano JG, Mason SE. Density Functional Theory and Thermodynamics Modeling of Inner-Sphere Oxyanion Adsorption on the Hydroxylated α-Al 2O 3(001) Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:13166-13180. [PMID: 32946243 DOI: 10.1021/acs.langmuir.0c01203] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The inner-sphere adsorption of AsO43-, PO43-, and SO42- on the hydroxylated α-Al2O3(001) surface was modeled with the goal of adapting a density functional theory (DFT) and thermodynamics framework for calculating the adsorption energetics. While DFT is a reliable method for predicting various properties of solids, including crystalline materials comprised of hundreds (or even thousands) of atoms, adding aqueous energetics in heterogeneous systems poses steep challenges for modeling. This is in part due to the fact that environmentally relevant variations in the chemical surroundings cannot be captured atomistically without increasing the system size beyond tractable limits. The DFT + thermodynamics approach to this conundrum is to combine the DFT total energies with tabulated solution-phase data and Nernst-based corrective terms to incorporate experimentally tunable parameters such as concentration. Central to this approach is the design of thermodynamic cycles that partition the overall reaction (here, inner-sphere adsorption proceeding via ligand exchange) into elementary steps that can either be fully calculated or for which tabulated data are available. The ultimate goal is to develop a modeling framework that takes into account subtleties of the substrate (such as adsorption-induced surface relaxation) and energies associated with the aqueous environment such that adsorption at mineral-water interfaces can be reliably predicted, allowing for comparisons in the denticity and protonation state of the adsorbing species. Based on the relative amount of experimental information available for AsO43-, PO43-, and SO42- adsorbates and the well-characterized hydroxylated α-Al2O3(001) surface, these systems are chosen to form a basis for assessing the model predictions. We discuss how the DFT + thermodynamics results are in line with the experimental information about the oxyanion sorption behavior. Additionally, a vibrational analysis was conducted for the charge-neutral oxyanion complexes and is compared to the available experimental findings to discern the inner-sphere adsorption phonon modes. The DFT + thermodynamics framework used here is readily extendable to other chemical processes at solid-liquid interfaces, and we discuss future directions for modeling surface processes at mineral-water and environmental interfaces.
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Affiliation(s)
| | - Jennifer L Bjorklund
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52245, United States
| | - Logan J Augustine
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52245, United States
| | - Jeffrey G Catalano
- Department of Earth and Planetary Sciences, Washington University, St. Louis, Missouri 63130, United States
| | - Sara E Mason
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52245, United States
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17
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Abstract
A series of γ-alumina samples with different exposure ratio of {111} facet were synthesized by an efficient hydrothermal method via adjusting the pH value of the gel precursor. The nanorod alumina supported catalyst with the highest exposure of {111} facet exhibited the best hydrodesulfurization (HDS) activities of both thiophene and dibenzothiophene (DBT). Characterization of the sulfided NiMo/Al2O3 catalyst with preferential exposure of {111} facet showed that the MoS2 nano slabs were inclined to distribute in the direction along the edges of alumina nanocrystal in reduced stacking layers. The selective exposure of {111} facet played a decisive role in obtaining alumina-supported HDS catalysts with improved intrinsic activity. This work helps to better understand the relationship between catalytic properties and varied support surfaces, which demonstrate a proper design of the catalyst support morphology on the facet-level.
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18
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Abstract
In the present study, the influence of experimental variables on the growth characteristics and texture development in chemically vapour deposited α-Al2O3 coatings was investigated. The emphasis was on the effects of H2S. The α-Al2O3 layers were deposited from the AlCl3-H2-CO2-HCl-H2S precursor system onto intermediate Ti(C,N) layers. The substrate was cemented carbide. The coatings were characterized with respect to microstructure and texture using X-ray diffraction, scanning electron microscopy and electron back-scattering diffraction. The observations were unpredictable, suggesting that in addition to the growth rate, H2S strongly affected the texture of the α-Al2O3 coatings. The uncatalyzed α-Al2O3 coatings (H2S = 0) developed (11 2 ¯ 0) texture. With the increment of H2S concentration the texture changed from (11 2 ¯ 0) texture through (10 1 ¯ 0), (10 1 ¯ 2) and (10 1 ¯ 4) textures to (0001) texture. Growth regimes for (11 2 ¯ 0), (10 1 ¯ 0), (10 1 ¯ 2), (10 1 ¯ 4) and (0001) textures were depicted as a function of the H2S/CO2 ratio. Examples of grain-boundary and microstructural manipulation of CVD α-Al2O3 layers by applying texture control were presented.
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19
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Sun Y, Moe YA, Xu Y, Sun Y, Wang X, Li F, Liu K, Wang R. Evolution of local strain in Ag-deposited monolayer MoS 2 modulated by interface interactions. NANOSCALE 2019; 11:22432-22439. [PMID: 31742287 DOI: 10.1039/c9nr07599b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Strain is usually unavoidable in the fabrication of devices based on two-dimensional (2D) transition metal chalcogenides (TMDCs). When metals are deposited onto monolayer TMDCs, strain can be induced at metal-TMDC interfaces and evolves with elapsed time. However, the effect of the substrate on the strain evolution at the metal-TMDC interfaces is still unclear, which hinders the development of reliable 2D TMDC-based devices with perfect contacts. In this work, we investigated the evolution of metal-induced local strains for Ag-deposited monolayer MoS2 on three kinds of substrates with different interface interactions, i.e., sapphire, SiO2/Si, and mica. The interface interaction between MoS2 and sapphire is the strongest, while that between MoS2 and mica is the weakest. With the splitting of MoS2 Raman peaks as an indicator of local strain, the evolution behavior of the local strain at the Ag-MoS2 interfaces is found to greatly depend on the interface interactions from the underlying substrates. With elapsed time, the local strain is best preserved on sapphire but relaxed most easily on mica. Density-functional theory calculations show that the adsorption energies at the interfaces are different for MoS2 on different substrates, suggesting that the interface interaction between monolayer MoS2 and the substrates is crucial for the strain evolution. Our work is of benefit for the study of stability and reliability of devices based on TMDCs, particularly for flexible electronic devices.
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Affiliation(s)
- Yinghui Sun
- Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China.
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20
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Atomic mechanism of strong interactions at the graphene/sapphire interface. Nat Commun 2019; 10:5013. [PMID: 31676774 PMCID: PMC6825119 DOI: 10.1038/s41467-019-13023-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Accepted: 10/09/2019] [Indexed: 12/05/2022] Open
Abstract
For atomically thin two-dimensional materials, interfacial effects may dominate the entire response of devices, because most of the atoms are in the interface/surface. Graphene/sapphire has great application in electronic devices and semiconductor thin-film growth, but the nature of this interface is largely unknown. Here we find that the sapphire surface has a strong interaction with some of the carbon atoms in graphene to form a C-O-Al configuration, indicating that the interface interaction is no longer a simple van der Waals interaction. In addition, the structural relaxation of sapphire near the interface is significantly suppressed and very different from that of a bare sapphire surface. Such an interfacial C-O-Al bond is formed during graphene growth at high temperature. Our study provides valuable insights into understanding the electronic structures of graphene on sapphire and remote control of epitaxy growth of thin films by using a graphene–sapphire substrate. Understanding the atomic arrangement and binding nature of 2D materials with substrates is crucial to understand their properties and utilize their functions. Here, authors report that at high temperature graphene and α-Al2O3 substrate form a C-O-Al bond, having strong interactions, while interfacial structural relaxations of sapphire remain suppressed.
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21
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Pan HX, Feng LP, Zeng W, Zhang QC, Zhang XD, Liu ZT. Active Sites in Single-Layer BiOX (X = Cl, Br, and I) Catalysts for the Hydrogen Evolution Reaction. Inorg Chem 2019; 58:13195-13202. [DOI: 10.1021/acs.inorgchem.9b02053] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Hai-xi Pan
- State Key Lab of Solidification Processing, College of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China
| | - Li-ping Feng
- State Key Lab of Solidification Processing, College of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China
| | - Wei Zeng
- State Key Lab of Solidification Processing, College of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China
| | - Quan-chao Zhang
- State Key Lab of Solidification Processing, College of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China
| | - Xiao-dong Zhang
- State Key Lab of Solidification Processing, College of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China
| | - Zheng-tang Liu
- State Key Lab of Solidification Processing, College of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China
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22
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Li Y, Yang J, Zhu YA, Sui ZJ, Zhou XG, Chen D, Yuan WK. Surface phase diagrams of La-based perovskites towards the O-rich limit from first principles. Phys Chem Chem Phys 2019; 21:12859-12871. [PMID: 31184338 DOI: 10.1039/c9cp02288k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The exposed termination of transition-metal oxide surfaces plays a major role in determining the catalyst performance in redox reactions. In this contribution, the surface phase diagrams of LaMO3(001) (M = Sc-Fe) and LaMO3(110) (M = Co-Cu) are constructed by using the DFT+U method. The stabilities of six terminations derived from the stoichiometric MO2 and LaO surfaces are determined over a wide range of temperatures and oxygen partial pressures. The surface phase diagrams are calculated towards the O-rich limit in which the chemical potential of oxygen anions of perovskites equals that of gas-phase oxygen while the chemical potential of M cations is limited by thermodynamic boundary conditions. It is found that the surface phase diagrams are closely related to the reducibility of M cations, which is reflected in the oxygen adsorption energy and oxygen vacancy formation energy on the MO2- and LaO-terminated surfaces and can be measured by the third ionization energies of the M2+ cations. According to the surface phase diagrams, the most stable surface termination is predicted to be of MO2 type for LaMO3 (M = Sc-Fe) and LaO type for LaMO3 (M = Co-Cu) under solid oxide fuel cell operating conditions. Because the M cations become more readily reduced on going from left to right across the period, LaCoO3 may form an oxygen-deficient crystal structure at high temperatures and LaNiO3 and LaCuO3 would be decomposed into oxides containing the transition metals in a lower oxidation state.
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Affiliation(s)
- Yang Li
- United Chemical Reaction Engineering Research Institute (UNILAB), State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.
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23
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Ma S, Brown AJ, Yan R, Davidchack RL, Howes PB, Nicklin C, Zhai Q, Jing T, Dong H. Atomistics of pre-nucleation layering of liquid metals at the interface with poor nucleants. Commun Chem 2019. [DOI: 10.1038/s42004-018-0104-1] [Citation(s) in RCA: 85] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Melani G, Nagata Y, Wirth J, Saalfrank P. Vibrational spectroscopy of hydroxylated α-Al 2O 3(0001) surfaces with and without water: An ab initio molecular dynamics study. J Chem Phys 2018; 149:014707. [PMID: 29981538 DOI: 10.1063/1.5023347] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Using gradient- and dispersion-corrected density functional theory in connection with ab initio molecular dynamics and efficient, parametrized Velocity-Velocity Autocorrelation Function (VVAF) methodology, we study the vibrational spectra (Vibrational Sum Frequency, VSF, and infrared, IR) of hydroxylated α-Al2O3(0001) surfaces with and without additional water. Specifically, by considering a naked hydroxylated surface and the same surface with a particularly stable, "ice-like" hexagonal water later allows us to identify and disentangle main spectroscopic bands of OH bonds, their orientation and dynamics, and the role of water adsorption. In particular, we assign spectroscopic signals around 3700 cm-1 as being dominated by perpendicularly oriented non-hydrogen bonded aluminol groups, with and without additional water. Furthermore, the thin water layer gives spectroscopic signals which are already comparable to previous theoretical and experimental findings for the solid/(bulk) liquid interface, showing that water molecules closest to the surface play a decisive role in the vibrational response of these systems. From a methodological point of view, the effects of temperature, anharmonicity, hydrogen-bonding, and structural dynamics are taken into account and analyzed, allowing us to compare the calculated IR and VSF spectra with the ones based on normal mode analysis and vibrational density of states. The VVAF approach employed in this work appears to be a computationally accurate yet feasible method to address the vibrational fingerprints and dynamical properties of water/metal oxide interfaces.
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Affiliation(s)
- Giacomo Melani
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam-Golm, Germany
| | - Yuki Nagata
- Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Jonas Wirth
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam-Golm, Germany
| | - Peter Saalfrank
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam-Golm, Germany
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25
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Latimer AA, Kakekhani A, Kulkarni AR, Nørskov JK. Direct Methane to Methanol: The Selectivity–Conversion Limit and Design Strategies. ACS Catal 2018. [DOI: 10.1021/acscatal.8b00220] [Citation(s) in RCA: 132] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Allegra A. Latimer
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, 450 Serra Mall, Stanford, California 94305, United States
| | - Arvin Kakekhani
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, 450 Serra Mall, Stanford, California 94305, United States
| | - Ambarish R. Kulkarni
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, 450 Serra Mall, Stanford, California 94305, United States
| | - Jens K. Nørskov
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, 450 Serra Mall, Stanford, California 94305, United States
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
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Liu H, Fang Z, Su Y, Suo Y, Huang S, Zhang Y, Ding K. Different Atomic Terminations Affect the Photocatalytic Nitrogen Fixation of Bismuth Oxybromide: A First Principles Study. Chem Asian J 2018; 13:799-808. [PMID: 29342324 DOI: 10.1002/asia.201701670] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 01/17/2018] [Indexed: 01/05/2023]
Affiliation(s)
- Hongxian Liu
- Department of Chemistry, Research Institute of Photocatalysis; State Key Laboratory of Photocatalysis on Energy and Environment; Fuzhou University; Fuzhou, Fujian 350108 China
| | - Zhenxing Fang
- Department of Physics; Zunyi Normal University; Zunyi, Guizhou 563006 China
| | - Yongfei Su
- Department of Chemistry, Research Institute of Photocatalysis; State Key Laboratory of Photocatalysis on Energy and Environment; Fuzhou University; Fuzhou, Fujian 350108 China
| | - Yuanli Suo
- Department of Chemistry, Research Institute of Photocatalysis; State Key Laboratory of Photocatalysis on Energy and Environment; Fuzhou University; Fuzhou, Fujian 350108 China
| | - Shuping Huang
- Department of Chemistry, Research Institute of Photocatalysis; State Key Laboratory of Photocatalysis on Energy and Environment; Fuzhou University; Fuzhou, Fujian 350108 China
| | - Yongfan Zhang
- Department of Chemistry, Research Institute of Photocatalysis; State Key Laboratory of Photocatalysis on Energy and Environment; Fuzhou University; Fuzhou, Fujian 350108 China
- Key Laboratory of Optoelectronic Materials Chemistry and Physics; Chinese Academy of Sciences; Fuzhou, Fujian 350002 China
| | - Kaining Ding
- Department of Chemistry, Research Institute of Photocatalysis; State Key Laboratory of Photocatalysis on Energy and Environment; Fuzhou University; Fuzhou, Fujian 350108 China
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27
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Density Functional Theory Study of Arsenate Adsorption onto Alumina Surfaces. MINERALS 2018. [DOI: 10.3390/min8030091] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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28
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Zhang CH, Chen B, Jin Y. Density functional theory study of the OH, Cl and H 2O coadsorption on the step-defect Al 2O 3 film surface. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2018. [DOI: 10.1142/s0219633618500025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Density functional theory has been performed on the step-defect Al2O3 film surfaces with the OH, Cl and H2O molecules coadsorption. Three kinds of step-defect (Al, O2, Al3) surfaces are optimized and the adsorption energy, the binding energies of film and adsorbates are calculated. The energy properties are similar in H2O or Cl coadsorption configurations, but have obvious differences for the OH group coadsorption configuration due to large numbers of adsorbate species and numbers. After structural relaxation, most of the step-defect surfaces could be easily hydroxylated. The Al3 step-defect surfaces are easier to be corroded by H2O and coadsorption molecules due to lots of unsaturated dangling bonds, some H2O molecules are located into the step-defect, surface Al atoms collapse inside the steps and several inner O atoms move outside the film. When the Cl exists in the aqueous solution, it would restrict H2O molecules from dissociating into OH groups. Moreover, the dissociation and recombination of H2O molecules could be promoted by OH groups.
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Affiliation(s)
- Chuan-Hui Zhang
- National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 10083, P. R. China
| | - Bao Chen
- National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 10083, P. R. China
| | - Ying Jin
- National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 10083, P. R. China
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29
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Kenmoe S, Biedermann PU. Water adsorbate phases on ZnO and impact of vapor pressure on the equilibrium shape of nanoparticles. J Chem Phys 2018; 148:054701. [PMID: 29421882 DOI: 10.1063/1.5016122] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
ZnO nanoparticles are used as catalysts and have potential applications in gas-sensing and solar energy conversion. A fundamental understanding of the exposed crystal facets, their surface chemistry, and stability as a function of environmental conditions is essential for rational design and improvement of synthesis and properties. We study the stability of water adsorbate phases on the non-polar low-index (101¯0) and (112¯0) surfaces from low coverage to multilayers using ab initio thermodynamics. We show that phonon contributions and the entropies due to a 2D lattice gas at low coverage and multiple adsorbate configurations at higher coverage have an important impact on the stability range of water adsorbate phases in the (T,p) phase diagram. Based on this insight, we compute and analyze the possible growth mode of water films for pressures ranging from UHV via ambient conditions to high pressures and the impact of water adsorption on the equilibrium shape of nanoparticles in a humid environment. A 2D variant of the Wulff construction shows that the (101¯0) and (112¯0) surfaces coexist on 12-faceted prismatic ZnO nanoparticles in dry conditions, while in humid environment, the (101¯0) surface is selectively stabilized by water adsorption resulting in hexagonal prisms.
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Affiliation(s)
- Stephane Kenmoe
- Max-Planck-Institut für Eisenforschung GmbH, Max-Planck Straße 1, 40237 Düsseldorf, Germany
| | - P Ulrich Biedermann
- Max-Planck-Institut für Eisenforschung GmbH, Max-Planck Straße 1, 40237 Düsseldorf, Germany
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30
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Hwang JY, Kim YM, Lee KH, Ohta H, Kim SW. Te Monolayer-Driven Spontaneous van der Waals Epitaxy of Two-dimensional Pnictogen Chalcogenide Film on Sapphire. NANO LETTERS 2017; 17:6140-6145. [PMID: 28902517 DOI: 10.1021/acs.nanolett.7b02737] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Demands on high-quality layer structured two-dimensional (2D) thin films such as pnictogen chalcogenides and transition metal dichalcogenides are growing due to the findings of exotic physical properties and potentials for device applications. However, the difficulties in controlling epitaxial growth and the unclear understanding of van der Waals epitaxy (vdWE) for a 2D chalcogenide film on a three-dimensional (3D) substrate have been major obstacles for the further advances of 2D materials. Here, we exploit the spontaneous vdWE of a high-quality 2D chalcogenide (Bi0.5Sb1.5Te3) film by the chalcogen-driven surface reconstruction of a conventional 3D sapphire substrate. It is verified that the in situ formation of a pseudomorphic Te atomic monolayer on the surface of sapphire, which results in a dangling bond-free surface, allows the spontaneous vdWE of 2D chalcogenide film. Since this route uses the natural surface reconstruction of sapphire with chalcogen under vacuum condition, it can be scalable and easily utilized for the developments of various 2D chalcogenide vdWE films through conventional thin-film fabrication technologies.
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Affiliation(s)
- Jae-Yeol Hwang
- Department of Energy Science, SungKyunKwan University , Suwon 16419, Republic of Korea
| | - Young-Min Kim
- Department of Energy Science, SungKyunKwan University , Suwon 16419, Republic of Korea
- Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea
| | - Kyu Hyoung Lee
- Department of Nano Applied Engineering, Kangwon National University , Chuncheon 24341, Republic of Korea
| | - Hiromichi Ohta
- Research Institute for Electronic Science, Hokkaido University , N20W10, Kita, Sapporo 001-0020, Japan
| | - Sung Wng Kim
- Department of Energy Science, SungKyunKwan University , Suwon 16419, Republic of Korea
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31
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Baxter ET, Ha MA, Cass AC, Alexandrova AN, Anderson SL. Ethylene Dehydrogenation on Pt4,7,8 Clusters on Al2O3: Strong Cluster Size Dependence Linked to Preferred Catalyst Morphologies. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00409] [Citation(s) in RCA: 93] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Eric T. Baxter
- Department
of Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Mai-Anh Ha
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Ashley C. Cass
- Department
of Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Anastassia N. Alexandrova
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
- California NanoSystems Institute, Los Angeles, California 90095, United States
| | - Scott L. Anderson
- Department
of Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
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32
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Fates of Hydrogen During Alumina Growth Below Yttria Nodules in FeCrAl(RE) at Low Partial Pressures of Water. Electrocatalysis (N Y) 2017. [DOI: 10.1007/s12678-017-0368-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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33
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Corum KW, Huang X, Bennett JW, Mason SE. Systematic density functional theory study of the structural and electronic properties of constrained and fully relaxed (0 0 1) surfaces of alumina and hematite. MOLECULAR SIMULATION 2017. [DOI: 10.1080/08927022.2017.1285402] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Katie W. Corum
- Department of Chemistry, University of Iowa, Iowa City, IA, USA
| | - Xu Huang
- Department of Chemistry, University of Iowa, Iowa City, IA, USA
| | - J. W. Bennett
- Department of Chemistry, University of Iowa, Iowa City, IA, USA
| | - S. E. Mason
- Department of Chemistry, University of Iowa, Iowa City, IA, USA
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35
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Wang B, Zhao N, Wang Y, Zhang W, Lu W, Guo X, Liu J. Electrolyte-controlled discharge product distribution of Na–O2 batteries: a combined computational and experimental study. Phys Chem Chem Phys 2017; 19:2940-2949. [DOI: 10.1039/c6cp07537a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Tuning the composition of discharge products is an important strategy to reduce charge potential, suppress side reactions, and improve the reversibility of metal–oxygen batteries.
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Affiliation(s)
- Beizhou Wang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Sciences
- Shanghai 200050
- P. R. China
| | - Ning Zhao
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Sciences
- Shanghai 200050
- P. R. China
| | - Youwei Wang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Sciences
- Shanghai 200050
- P. R. China
| | - Wenqing Zhang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Sciences
- Shanghai 200050
- P. R. China
| | - Wencong Lu
- Department of Chemistry, College of Sciences
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Xiangxin Guo
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Sciences
- Shanghai 200050
- P. R. China
| | - Jianjun Liu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Sciences
- Shanghai 200050
- P. R. China
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36
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Sun J, Lin N, Tang C, Ren H, Zhao X. A first principles study of the interaction between two-dimensional black phosphorus and Al2O3dielectric. RSC Adv 2017. [DOI: 10.1039/c6ra27271a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
First principles calculations have been performed to study the structural, energetic, and electronic properties of BP on Al-terminated and hydroxylated Al2O3(0001) surfaces.
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Affiliation(s)
- Jie Sun
- State Key Laboratory of Crystal Materials
- Shandong University
- 250100 Jinan
- PR China
| | - Na Lin
- State Key Laboratory of Crystal Materials
- Shandong University
- 250100 Jinan
- PR China
| | - Cheng Tang
- State Key Laboratory of Crystal Materials
- Shandong University
- 250100 Jinan
- PR China
| | - Hao Ren
- State Key Laboratory of Heavy Oil Processing & Center for Bioengineering and Biotechnology
- China University of Petroleum (East China)
- 266580 Qingdao
- PR China
| | - Xian Zhao
- State Key Laboratory of Crystal Materials
- Shandong University
- 250100 Jinan
- PR China
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37
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Chaka AM. Ab Initio Thermodynamics and the Relationship between Octahedral Distortion, Lattice Structure, and Proton Substitution Defects in Malachite/Rosasite Group Endmember Pokrovskite Mg2CO3(OH)2. J Phys Chem A 2016; 120:10181-10195. [DOI: 10.1021/acs.jpca.6b11969] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anne M. Chaka
- Pacific Northwest National Laboratory, P.O. Box 999, MS K8-96, Richland, Washington 99352, United States
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38
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Arrigoni M, Kotomin EA, Maier J. First-principles Study of Perovskite Ultrathin Films: Stability and Confinement Effects. Isr J Chem 2016. [DOI: 10.1002/ijch.201600056] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Marco Arrigoni
- Max Planck Institute for Solid State Research; Heisenbergstraße 1 70569 Stuttgart Germany
| | - Eugene A. Kotomin
- Max Planck Institute for Solid State Research; Heisenbergstraße 1 70569 Stuttgart Germany
| | - Joachim Maier
- Max Planck Institute for Solid State Research; Heisenbergstraße 1 70569 Stuttgart Germany
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39
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Dabaghmanesh S, Neyts EC, Partoens B. van der Waals density functionals applied to corundum-type sesquioxides: bulk properties and adsorption of CH3 and C6H6 on (0001) surfaces. Phys Chem Chem Phys 2016; 18:23139-46. [PMID: 27494541 DOI: 10.1039/c6cp00346j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
van der Waals (vdW) forces play an important role in the adsorption of molecules on the surface of solids. However, the choice of the most suitable vdW functional for different systems is an essential problem which must be addressed for different systems. The lack of a systematic study on the performance of the vdW functionals in the bulk and adsorption properties of metal-oxides motivated us to examine different vdW approaches and compute the bulk and molecular adsorption properties of α-Cr2O3, α-Fe2O3, and α-Al2O3. For the bulk properties, we compared our results for the heat of formation, cohesive energy, lattice parameters and bond distances between the different vdW functionals and available experimental data. Next we studied the adsorption of benzene and CH3 molecules on top of different oxide surfaces. We employed different approximations to exchange and correlation within DFT, namely, the Perdew-Burke-Ernzerhof (PBE) GGA, (PBE)+U, and vdW density functionals [DFT(vdW-DF/DF2/optPBE/optB86b/optB88)+U] as well as DFT-D2/D3(+U) methods of Grimme for the bulk calculations and optB86b-vdW(+U) and DFT-D2(+U) for the adsorption energy calculations. Our results highlight the importance of vdW interactions not only in the adsorption of molecules, but importantly also for the bulk properties. Although the vdW contribution in the adsorption of CH3 (as a chemisorption interaction) is less important compared to the adsorption of benzene (as a physisorption interaction), this contribution is not negligible. Also adsorption of benzene on ferryl/chromyl terminated surfaces shows an important chemisorption contribution in which the vdW interactions become less significant.
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Affiliation(s)
- Samira Dabaghmanesh
- Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium. and Research Group PLASMANT, Department of Chemistry, University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, Belgium
| | - Erik C Neyts
- Research Group PLASMANT, Department of Chemistry, University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, Belgium
| | - Bart Partoens
- Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium.
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40
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Löfgren J, Grönbeck H, Moth-Poulsen K, Erhart P. Understanding the Phase Diagram of Self-Assembled Monolayers of Alkanethiolates on Gold. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2016; 120:12059-12067. [PMID: 27313813 PMCID: PMC4904245 DOI: 10.1021/acs.jpcc.6b03283] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 05/11/2016] [Indexed: 05/19/2023]
Abstract
Alkanethiolate monolayers on gold are important both for applications in nanoscience as well as fundamental studies of adsorption and self-assembly at metal surfaces. While considerable experimental effort has been put into understanding the phase diagram of these systems, theoretical work based on density functional theory (DFT) has long been hampered by the inability of conventional exchange-correlation functionals to describe dispersive interactions. In this work, we combine dispersion-corrected DFT calculations using the new vdW-DF-CX functional with the ab initio thermodynamics method to study the stability of dense standing-up and low-coverage lying-down phases on Au(111). We demonstrate that the lying-down phase has a thermodynamic region of stability starting from thiolates with alkyl chains consisting of n ≈ 3 methylene units. This phase emerges as a consequence of a competition between dispersive chain-chain and chain-substrate interactions, where the strength of the latter varies more strongly with n. A phase diagram is derived under ultrahigh-vacuum conditions, detailing the phase transition temperatures of the system as a function of the chain length. The present work illustrates that accurate ab initio modeling of dispersive interactions is both feasible and essential for describing self-assembled monolayers.
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Affiliation(s)
- Joakim Löfgren
- Department of Physics and Department of
Chemistry and Chemical Engineering, Chalmers
University of Technology, Gothenburg, Sweden
- E-mail ; Phone 0046317722902 (J.L.)
| | - Henrik Grönbeck
- Department of Physics and Department of
Chemistry and Chemical Engineering, Chalmers
University of Technology, Gothenburg, Sweden
| | - Kasper Moth-Poulsen
- Department of Physics and Department of
Chemistry and Chemical Engineering, Chalmers
University of Technology, Gothenburg, Sweden
| | - Paul Erhart
- Department of Physics and Department of
Chemistry and Chemical Engineering, Chalmers
University of Technology, Gothenburg, Sweden
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41
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Jang AR, Hong S, Hyun C, Yoon SI, Kim G, Jeong HY, Shin TJ, Park SO, Wong K, Kwak SK, Park N, Yu K, Choi E, Mishchenko A, Withers F, Novoselov KS, Lim H, Shin HS. Wafer-Scale and Wrinkle-Free Epitaxial Growth of Single-Orientated Multilayer Hexagonal Boron Nitride on Sapphire. NANO LETTERS 2016; 16:3360-3366. [PMID: 27120101 DOI: 10.1021/acs.nanolett.6b01051] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Large-scale growth of high-quality hexagonal boron nitride has been a challenge in two-dimensional-material-based electronics. Herein, we present wafer-scale and wrinkle-free epitaxial growth of multilayer hexagonal boron nitride on a sapphire substrate by using high-temperature and low-pressure chemical vapor deposition. Microscopic and spectroscopic investigations and theoretical calculations reveal that synthesized hexagonal boron nitride has a single rotational orientation with AA' stacking order. A facile method for transferring hexagonal boron nitride onto other target substrates was developed, which provides the opportunity for using hexagonal boron nitride as a substrate in practical electronic circuits. A graphene field effect transistor fabricated on our hexagonal boron nitride sheets shows clear quantum oscillation and highly improved carrier mobility because the ultraflatness of the hexagonal boron nitride surface can reduce the substrate-induced degradation of the carrier mobility of two-dimensional materials.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - Sang Kyu Kwak
- Center for Multidimensional Carbon Materials, Institute of Basic Science (IBS) , Ulsan 44919, Republic of Korea
| | - Noejung Park
- Center for Multidimensional Carbon Materials, Institute of Basic Science (IBS) , Ulsan 44919, Republic of Korea
| | - Kwangnam Yu
- Department of Physics, University of Seoul , Seoul 02504, Republic of Korea
| | - Eunjip Choi
- Department of Physics, University of Seoul , Seoul 02504, Republic of Korea
| | - Artem Mishchenko
- School of Physics and Astronomy, University of Manchester , Manchester M13 9PL, United Kingdom
| | - Freddie Withers
- School of Physics and Astronomy, University of Manchester , Manchester M13 9PL, United Kingdom
| | - Kostya S Novoselov
- School of Physics and Astronomy, University of Manchester , Manchester M13 9PL, United Kingdom
| | - Hyunseob Lim
- Center for Multidimensional Carbon Materials, Institute of Basic Science (IBS) , Ulsan 44919, Republic of Korea
| | - Hyeon Suk Shin
- Center for Multidimensional Carbon Materials, Institute of Basic Science (IBS) , Ulsan 44919, Republic of Korea
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42
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Liu JC, Tang Y, Chang CR, Wang YG, Li J. Mechanistic Insights into Propene Epoxidation with O2–H2O Mixture on Au7/α-Al2O3: A Hydroproxyl Pathway from ab Initio Molecular Dynamics Simulations. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00021] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jin-Cheng Liu
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
| | - Yan Tang
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
| | - Chun-Ran Chang
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
- Institute
of Industrial Catalysis, School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
| | - Yang-Gang Wang
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
| | - Jun Li
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
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43
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44
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Carchini G, García-Melchor M, Łodziana Z, López N. Understanding and Tuning the Intrinsic Hydrophobicity of Rare-Earth Oxides: A DFT+U Study. ACS APPLIED MATERIALS & INTERFACES 2016; 8:152-160. [PMID: 26652180 DOI: 10.1021/acsami.5b07905] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Rare-earth oxides (REOs) possess a remarkable intrinsic hydrophobicity, making them candidates for a myriad of applications. Although the superhydrophobicity of REOs has been explored experimentally, the atomistic details of the structure at the oxide-water interface are still not well understood. In this work, we report a density functional theory study of the interaction between water and CeO2, Nd2O3, and α-Al2O3 to explain their different wettability. The wetting of the metal oxide surface is controlled by geometric and electronic factors. While the electronic term is related to the acid-base properties of the surface layer, the geometric factor depends on the matching between adsorption sites and oxygen atoms from the hexagonal water network. For all the metal oxides considered here, water dissociation is confined to the first oxide-water layer. Hydroxyl groups on α-Al2O3 are responsible for the strong oxide-water interaction, and thus, both Al- and hydroxyl-terminated wet. On CeO2, the intrinsic hydrophobicity of the clean surface disappears when lattice hydroxyl groups (created by the reaction of water with oxygen vacancies) are present as they dominate the interaction and drive wetting. Therefore, hydroxyls may convert a intrinsic nonwetting surface into a wetting one. Finally, we also report that surface modifications, like cation substitution, do not change the acid-base character of the surface, and thus they show the same nonwetting properties as native CeO2 or Nd2O3.
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Affiliation(s)
- Giuliano Carchini
- ICIQ - Institute of Chemical Research of Catalonia, The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Max García-Melchor
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States
| | - Zbigniew Łodziana
- Institute of Nuclear Physics, Polish Academy of Sciences , ulica Radzikowskiego 152, PL-31-342 Krakow, Poland
| | - Núria López
- ICIQ - Institute of Chemical Research of Catalonia , Av. Països Catalans 16, 43007 Tarragona, Spain
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45
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Ovcharenko R, Voloshina E, Sauer J. Water adsorption and O-defect formation on Fe2O3(0001) surfaces. Phys Chem Chem Phys 2016; 18:25560-25568. [DOI: 10.1039/c6cp05313k] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Detailed theoretical understanding of the interaction between pristine and defective α-Fe2O3(0001) surfaces and an isolated water molecule.
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Affiliation(s)
- Roman Ovcharenko
- Humboldt-Universität zu Berlin
- Institut für Chemie
- 10099 Berlin
- Germany
| | - Elena Voloshina
- Humboldt-Universität zu Berlin
- Institut für Chemie
- 10099 Berlin
- Germany
| | - Joachim Sauer
- Humboldt-Universität zu Berlin
- Institut für Chemie
- 10099 Berlin
- Germany
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46
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Cavallotti R, Thi Le HL, Goniakowski J, Lazzari R, Jupille J, Koltsov A, Loison D. New routes for improving adhesion at the metal/α-Al2O3(0001) interface. Phys Chem Chem Phys 2016; 18:3032-9. [DOI: 10.1039/c5cp06435j] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Enrichment in transition metals improves adhesion at alumina/zinc interface.
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Affiliation(s)
- Rémi Cavallotti
- CNRS
- UMR 7588
- Institut des Nanosciences de Paris
- F-75005 Paris
- France
| | - Ha-Linh Thi Le
- CNRS
- UMR 7588
- Institut des Nanosciences de Paris
- F-75005 Paris
- France
| | | | - Rémi Lazzari
- CNRS
- UMR 7588
- Institut des Nanosciences de Paris
- F-75005 Paris
- France
| | - Jacques Jupille
- CNRS
- UMR 7588
- Institut des Nanosciences de Paris
- F-75005 Paris
- France
| | - Alexey Koltsov
- ArcelorMittal Maizières Research
- voie Romaine
- Maizières lès Metz
- France
| | - Didier Loison
- ArcelorMittal Maizières Research
- voie Romaine
- Maizières lès Metz
- France
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47
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Weckman T, Laasonen K. First principles study of the atomic layer deposition of alumina by TMA-H2O-process. Phys Chem Chem Phys 2015; 17:17322-34. [PMID: 26074271 DOI: 10.1039/c5cp01912e] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Atomic layer deposition (ALD) is a coating technology used to produce highly uniform thin films. Aluminiumoxide, Al2O3, is mainly deposited using trimethylaluminium (TMA) and water as precursors and is the most studied ALD-process to date. However, only few theoretical studies have been reported in the literature. The surface reaction mechanisms and energetics previously reported focus on a gibbsite-like surface model but a more realistic description of the surface can be achieved when the hydroxylation of the surface is taken into account using dissociatively adsorbed water molecules. The adsorbed water changes the structure of the surface and reaction energetics change considerably when compared to previously studied surface model. Here we have studied the TMA-H2O process using density functional theory on a hydroxylated alumina surface and reproduced the previous results for comparison. Mechanisms and energetics during both the TMA and the subsequent water pulse are presented. TMA is found to adsorb exothermically onto the surface. The reaction barriers for the ligand-exchange reactions between the TMA and the surface hydroxyl groups were found to be much lower compared to previously presented results. TMA dissociation on the surface is predicted to saturate at monomethylaluminium. Barriers for proton diffusion between surface sites are observed to be low. TMA adsorption was also found to be cooperative with the formation of methyl bridges between the adsorbants. The water pulse was studied using single water molecules reacting with the DMA and MMA surface species. Barriers for these reactions were found to reasonable in the process conditions. However, stabilizing interactions amongst water molecules were found to lower the reaction barriers and the dynamical nature of water is predicted to be of importance. It is expected that these calculations can only set an upper limit for the barriers during the water pulse.
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Affiliation(s)
- Timo Weckman
- Aalto University, Kemistintie 1, Espoo, Finland.
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48
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Choudhary K, Liang T, Chernatynskiy A, Phillpot SR, Sinnott SB. Charge optimized many-body (COMB) potential for Al2O3 materials, interfaces, and nanostructures. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:305004. [PMID: 26151746 DOI: 10.1088/0953-8984/27/30/305004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This work presents the development and applications of a new empirical, variable charge potential for Al2O3 systems within the charge optimized many-body (COMB) potential framework. The potential can describe the fundamental physical properties of Al2O3, including cohesive energy, elastic constants, defect formation energies, surface energies and phonon properties of α-Al2O3 comparable to that obtained from experiments and first-principles calculations. The potential is further employed in classical molecular dynamics (MD) simulations to validate and predict the properties of the Al (1 1 1)-Al2O3 (0 0 0 1) interface, tensile properties of Al nanowires, Al2O3 nanowires, Al2O3-covered Al nanowires, and defective Al2O3 nanowires. The results demonstrate that the potential is well-suited to model heterogeneous material systems involving Al and Al2O3. Most importantly, the parameters can be seamlessly coupled with COMB3 parameters for other materials to enable MD simulations of a wide range of heterogeneous material systems.
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Affiliation(s)
- Kamal Choudhary
- Department of Materials Science and Engineering, University of Florida, Gainesville, FL, 32611, USA
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Tong Y, Wirth J, Kirsch H, Wolf M, Saalfrank P, Campen RK. Optically probing Al-O and O-H vibrations to characterize water adsorption and surface reconstruction on α-alumina: an experimental and theoretical study. J Chem Phys 2015; 142:054704. [PMID: 25662657 DOI: 10.1063/1.4906346] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Oxide/water interfaces are ubiquitous in a wide variety of applications and the environment. Despite this ubiquity, and attendant decades of study, gaining molecular level insight into water/oxide interaction has proven challenging. In part, this challenge springs from a lack of tools to concurrently characterize changes in surface structure (i.e., water/oxide interaction from the perspective of the solid) and O-H population and local environment (i.e., water/oxide interaction from the water perspective). Here, we demonstrate the application of surface specific vibrational spectroscopy to the characterization of the interaction of the paradigmatic α-Al2O3(0001) surface and water. By probing both the interfacial Al-O (surface phonon) and O-H spectral response, we characterize this interaction from both perspectives. Through electronic structure calculation, we assign the interfacial Al-O response and rationalize its changes on surface dehydroxylation and reconstruction. Because our technique is all-optical and interface specific, it is equally applicable to oxide surfaces in vacuum, ambient atmospheres and at the solid/liquid interface. Application of this approach to additional alumina surfaces and other oxides thus seems likely to significantly expand our understanding of how water meets oxide surfaces and thus the wide variety of phenomena this interaction controls.
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Affiliation(s)
- Yujin Tong
- Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | - Jonas Wirth
- Institute of Chemistry, University of Potsdam, 14476 Potsdam OT Golm, Germany
| | - Harald Kirsch
- Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | - Martin Wolf
- Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | - Peter Saalfrank
- Institute of Chemistry, University of Potsdam, 14476 Potsdam OT Golm, Germany
| | - R Kramer Campen
- Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany
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Ma X, Dai Y, Wei W, Huang B, Whangbo MH. Insights into How Fluorine-Adsorption and n-Type Doping Affect the Relative Stability of the (001) and (101) Surfaces of TiO2: Enhancing the Exposure of More Active but Thermodynamically Less Stable (001). J Phys Chem Lett 2015; 6:1876-82. [PMID: 26263263 DOI: 10.1021/acs.jpclett.5b00595] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The stability of both the pure and fluorine (F)-adsorbed surface of TiO2 is examined on the basis of density functional calculations. For pure surfaces, both the beneficial local geometric structures and local potential strengthen the Ti-O binding in (101), rendering it the most stable surface. For F-adsorbed surfaces, F-adsorption significantly weakens the Ti-O bonds in (101) but strengthens them in (001), so that (001) becomes more stable than (101) for the F-adsorbed surfaces. On the basis of this observation, we further show that the n-type doping in TiO2 can significantly decrease the ability of F-adsorption in switching the relative stability of the two surfaces. The present work not only provides new insights into the physical and chemical properties about both pure and F-adsorbed surfaces of TiO2 and conclusively explains related experimental results but also suggests viable ways to prepare TiO2 samples with a high percentage of (001).
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Affiliation(s)
- Xiangchao Ma
- †School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
| | - Ying Dai
- †School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
| | - Wei Wei
- †School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
| | - Baibiao Huang
- †School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
| | - Myung-Hwan Whangbo
- ‡Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
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