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Hu H, Liu Y, Shi F, Tao P, Song C, Shang W, Ke X, Deng T, Zeng X, Wu J. Corrosion Dynamics of Carbon-Supported Platinum Electrocatalysts with Metal-Carbon Interactions Revealed by In Situ Liquid Transmission Electron Microscopy. NANO LETTERS 2024; 24:2157-2164. [PMID: 38319745 DOI: 10.1021/acs.nanolett.3c03839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2024]
Abstract
Carbon support is essential for electrocatalysis, but limitations remain, as carbon corrosion can lead to electrocatalyst degradation and affect the long-term durability of electrocatalysts. Here, we studied the corrosion dynamics of carbon nanotubes (CNTs) and Vulcan carbon (VC) together with platinum (Pt) nanoparticles in real time by liquid cell (LC) transmission electron microscopy (TEM). The results showed that CNTs with a high degree of graphitization exhibited higher corrosion resistance compared to VC. Furthermore, we observed that the main degradation path of Pt nanoparticles in Pt/CNTs was ripening, while in Pt/VC, it was aggregation and coalescence, which was dominated by the interactions between Pt nanoparticles and different hybridization of carbon supports. Finally, we performed an ex situ CV stability test to confirm the conclusions obtained from in situ experiments. This work provides deep insights into the corrosion mechanism of carbon-supported electrocatalysts to optimize the design of electrocatalysts with a higher durability.
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Affiliation(s)
- Hao Hu
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
- Center of Hydrogen Science, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Yao Liu
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Fenglei Shi
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
- Center of Hydrogen Science, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Peng Tao
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Chengyi Song
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Wen Shang
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Xiaoxing Ke
- Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, People's Republic of China
| | - Tao Deng
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
- Center of Hydrogen Science, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Xiaoqin Zeng
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Jianbo Wu
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
- Center of Hydrogen Science, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
- Materials Genome Initiative Center, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
- Future Material Innovation Center, Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
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2
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Ye M, Song L, Ye Y, Deng Z. Assembly and Healing: Capacitive and Conductive Plasmonic Interfacing via a Unified and Clean Wet Chemistry Route. J Am Chem Soc 2023; 145:25653-25663. [PMID: 37963330 DOI: 10.1021/jacs.3c07879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2023]
Abstract
Solution-based nanoparticle assembly represents a highly promising way to build functional metastructures based on a wealth of synthetic nanomaterial building blocks with well-controlled morphology and crystallinity. In particular, the involvement of DNA molecular programming in these bottom-up processes gradually helps the ambitious goal of customizable chemical nanofabrication. However, a fundamental challenge is to realize strong interunit coupling in an assembly toward emerging functions and applications. Herein, we present a unified and clean strategy to address this critical issue based on a H2O2-redox-driven "assembly and healing" process. This facile solution route is able to realize both capacitively coupled and conductively bridged colloidal boundaries, simply switchable by the reaction temperature, toward bottom-up nanoplasmonic engineering. In particular, such a "green" process does not cause surface contamination of nanoparticles by exogenous active metal ions or strongly passivating ligands, which, if it occurs, could obscure the intrinsic properties of as-formed structures. Accordingly, previously raised questions regarding the activities of strongly coupled plasmonic structures are clarified. The reported process is adaptable to DNA nanotechnology, offering molecular programmability of interparticle charge conductance. This work represents a new generation of methods to make strongly coupled nanoassemblies, offering great opportunities for functional colloidal technology and even metal self-healing.
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Affiliation(s)
- Meiyun Ye
- Center for Bioanalytical Chemistry, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Lei Song
- Center for Bioanalytical Chemistry, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Yichen Ye
- Center for Bioanalytical Chemistry, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Zhaoxiang Deng
- Center for Bioanalytical Chemistry, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China
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3
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Luo C, Dong Z, Xu T, Yang X, Zhang H, Bi H, Wang C, Sun L, Chu J, Wu X. Tailoring the phase transition of silver selenide at the atomistic scale. NANOSCALE 2022; 14:16077-16084. [PMID: 36124640 DOI: 10.1039/d2nr04248g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Thermoelectric materials provide promising solutions for energy harvesting from the environment. Silver selenide (Ag2Se) material attracts much attention due to its excellent thermoelectric properties under superionic phase transition. However, the optimal thermoelectric figure of merit occurs during the phase transition at high temperatures, making low-temperature devices unable to benefit from their best thermoelectric performance. Here, we tailored the phase transition process of Ag2Se materials with various sizes, and probed the phase transition temperature by in situ transmission electron microscopy. By tuning the motion of the atoms near the surface using size-dependent surface energy, the phase transition-induced process is tailored towards low temperatures. This work paves the way for future phase transition engineering to enhance thermoelectric performance.
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Affiliation(s)
- Chen Luo
- Shanghai Key Laboratory of Multidimensional Information Processing, School of Communication and Electronic Engineering, East China Normal University, Shanghai 200241, China.
- Institute of Optoelectronics, Fudan University, Shanghai 200433, China
| | - Zuoyuan Dong
- Shanghai Key Laboratory of Multidimensional Information Processing, School of Communication and Electronic Engineering, East China Normal University, Shanghai 200241, China.
| | - Tao Xu
- SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China
| | - Xin Yang
- Shanghai Key Laboratory of Multidimensional Information Processing, School of Communication and Electronic Engineering, East China Normal University, Shanghai 200241, China.
| | - Hui Zhang
- SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China
| | - Hengchang Bi
- Shanghai Key Laboratory of Multidimensional Information Processing, School of Communication and Electronic Engineering, East China Normal University, Shanghai 200241, China.
| | - Chaolun Wang
- Shanghai Key Laboratory of Multidimensional Information Processing, School of Communication and Electronic Engineering, East China Normal University, Shanghai 200241, China.
| | - Litao Sun
- SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China
| | - Junhao Chu
- Shanghai Key Laboratory of Multidimensional Information Processing, School of Communication and Electronic Engineering, East China Normal University, Shanghai 200241, China.
- Institute of Optoelectronics, Fudan University, Shanghai 200433, China
| | - Xing Wu
- Shanghai Key Laboratory of Multidimensional Information Processing, School of Communication and Electronic Engineering, East China Normal University, Shanghai 200241, China.
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4
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Yu T, Zhou X, Chen Y, Chen J, Yuan S, Zhang Z, Qian L, Li S. Robust catalysis of hierarchically nanoporous gold for CO2 electrochemical reduction. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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5
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Akyildiz K, Kim JH, So JH, Koo HJ. Recent progress on micro- and nanoparticles of gallium-based liquid metal: From preparation to applications. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.09.046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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6
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Wang QG, Hou L, Lu AH. Kinetics-controlled regulation for homogeneous nucleation and growth of colloidal polymer and carbon nanospheres. Chem Commun (Camb) 2022; 58:9670-9673. [PMID: 35946406 DOI: 10.1039/d2cc03246e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Size regulation of uniform polymer nanospheres (PNSs) and carbon nanospheres (CNSs) below 100 nm has been difficult and is limited by multiple factors, such as ongoing nucleation, Ostwald ripening, minimization of surface energy, and high viscosity during the nucleation and growth process. In this study, a kinetics-controlled regulation is reported for the synthesis of monodispersed PNSs and corresponding CNSs with adjustable size below 100 nm. During the synthesis of PNSs, three distinct stages including surface energy control, surface tension control and viscosity control have been observed, where the concentration of block copolymer F127 (CF127) plays a vital role in affecting the nucleation rate of PNSs and tunes the diffusion rate of monomers and migration of particles during the nucleation and growth process. As a consequence, the size of monodisperse CNSs can be customized from 100 nm down to 41 nm with PDI below 5%.
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Affiliation(s)
- Quan-Gao Wang
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China.
| | - Lu Hou
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China.
| | - An-Hui Lu
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China.
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7
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Cai Q, Castagnola V, Boselli L, Moura A, Lopez H, Zhang W, de Araújo JM, Dawson KA. A microfluidic approach for synthesis and kinetic profiling of branched gold nanostructures. NANOSCALE HORIZONS 2022; 7:288-298. [PMID: 35119063 DOI: 10.1039/d1nh00540e] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Automatized approaches for nanoparticle synthesis and characterization represent a great asset to their applicability in the biomedical field by improving reproducibility and standardization, which help to meet the selection criteria of regulatory authorities. The scaled-up production of nanoparticles with carefully defined characteristics, including intrinsic morphological features, and minimal intra-batch, batch-to-batch, and operator variability, is an urgent requirement to elevate nanotechnology towards more trustable biological and technological applications. In this work, microfluidic approaches were employed to achieve fast mixing and good reproducibility in synthesizing a variety of gold nanostructures. The microfluidic setup allowed exploiting spatial resolution to investigate the growth evolution of the complex nanoarchitectures. By physically isolating intermediate reaction fractions, we performed an advanced characterization of the shape properties during their growth, not possible with routine characterization methods. Employing an in-house developed method to assign a specific identity to shapes, we followed the particle growth/deformation process and identified key reaction parameters for more precise control of the generated morphologies. Besides, this investigation led to the optimization of a one-pot multi-size and multi-shape synthesis of a variety of gold nanoparticles. In summary, we describe an optimized platform for highly controlled synthesis and a novel approach for the mechanistic study of shape-evolving nanomaterials.
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Affiliation(s)
- Qi Cai
- Centre for BioNano Interactions, School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.
| | - Valentina Castagnola
- Centre for BioNano Interactions, School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.
| | - Luca Boselli
- Centre for BioNano Interactions, School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.
| | - Alirio Moura
- Departamento de Física Teórica e Experimental, Universidade Federal do Rio Grande do Norte, 59078-970, Natal, RN, Brazil
| | - Hender Lopez
- School of Physics and Optometric & Clinical Sciences, Technological University Dublin, Grangegorman, D07 XT95, Ireland
| | - Wei Zhang
- Centre for BioNano Interactions, School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.
| | - João M de Araújo
- Departamento de Física Teórica e Experimental, Universidade Federal do Rio Grande do Norte, 59078-970, Natal, RN, Brazil
| | - Kenneth A Dawson
- Centre for BioNano Interactions, School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.
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8
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Acosta-Domínguez L, Cocotle-Ronzón Y, Alamilla-Beltrán L, Hernandez-Martinez E. Effect of a cryogenic treatment in the microstructure, functional and flow properties of soy protein isolate. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2021.106871] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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9
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Dong J, Hu H, Li H, Ouyang G. Spontaneous flexoelectricity and band engineering in MS 2 (M = Mo, W) nanotubes. Phys Chem Chem Phys 2021; 23:20574-20582. [PMID: 34505592 DOI: 10.1039/d1cp02090k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spontaneous flexoelectricity in transition metal dichalcogenide (TMD) nanotubes is critical to the design of new energy devices. However, the electronic properties adjusted by the flexoelectric effect in TMD nanotubes remain vague. In this work, we investigate the effect of flexoelectricity on band engineering in single- and double-wall MS2 (M = Mo, W) nanotubes with different diameters based on first-principles calculations and an atomic-bond-relaxation method. We find that the energy bandgap reduces and the polarization and flexoelectric voltage increase with decreasing diameter of single-wall MS2 nanotubes. The polarization charges promoted by the flexoelectric effect can lead to a straddling-to-staggered bandgap transition in the double-wall MS2 nanotubes. The critical diameters for bandgap transition are about 3.1 and 3.6 nm for double-wall MoS2 and WS2 nanotubes, respectively, which is independent of chirality. Our results provide guidance for the design of new energy devices based on spontaneous flexoelectricity.
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Affiliation(s)
- Jiansheng Dong
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, School of Physics and Electronics, Hunan Normal University, Changsha 410081, China.
| | - Huamin Hu
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, School of Physics and Electronics, Hunan Normal University, Changsha 410081, China.
| | - Hai Li
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, School of Physics and Electronics, Hunan Normal University, Changsha 410081, China.
| | - Gang Ouyang
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, School of Physics and Electronics, Hunan Normal University, Changsha 410081, China.
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10
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Villalobos-Castillejos F, Lartundo-Rojas L, Leyva-Daniel D, Porras-Saavedra J, Pereyra-Castro S, Gutiérrez-López G, Alamilla-Beltrán L. Effect of emulsification techniques on the distribution of components on the surface of microparticles obtained by spray drying. FOOD AND BIOPRODUCTS PROCESSING 2021. [DOI: 10.1016/j.fbp.2021.07.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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11
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Tsimpanogiannis IN. A novel hybrid method for the calculation of methane hydrate-water interfacial tension along the three-phase (hydrate-liquid water-vapor) equilibrium line. J Chem Phys 2021; 155:024702. [PMID: 34266278 DOI: 10.1063/5.0051383] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
We use a novel hybrid method to explore the temperature dependence of the solid-liquid interfacial tension of a system that consists of solid methane hydrate and liquid water. The calculated values along the three-phase (hydrate-liquid water-vapor) equilibrium line are obtained through the combination of available experimental measurements and computational results that are based on approaches at the atomistic scale, including molecular dynamics and Monte Carlo. An extensive comparison with available experimental and computational studies is performed, and a critical assessment and re-evaluation of previously reported data is presented.
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Affiliation(s)
- Ioannis N Tsimpanogiannis
- Chemical Process & Energy Resources Institute (CPERI), Centre for Research & Technology Hellas (CERTH), 57001 Thermi-Thessaloniki, Greece
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12
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Modulating vacancies in nonstoichiometric oxides by annealing polarized nanoporous NiCoMn as thick pseudocapacitive electrode. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2020.137628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Cheng Y, Khlyustova A, Chen P, Yang R. Kinetics of All-Dry Free Radical Polymerization under Nanoconfinement. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01534] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Yifan Cheng
- Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Alexandra Khlyustova
- Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Pengyu Chen
- Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Rong Yang
- Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
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14
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Wang J, Wang G, Wang Y, Li L, Ma Y, Li C, Dai S. Hierarchically Porous Polyacrylonitrile (PAN) 3D Architectures with Anchored Lattice-Expanded λ-MnO 2 Nanodots as Freestanding Adsorbents for Superior Lithium Separation. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c01198] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jianren Wang
- School of Environment and Civil Engineering, Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan, Guangdong 523106, China
- State Key Lab of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Gang Wang
- School of Environment and Civil Engineering, Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan, Guangdong 523106, China
- Chemical Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Yuwei Wang
- School of Environment and Civil Engineering, Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan, Guangdong 523106, China
| | - Ling Li
- Chemical Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Yuanqing Ma
- Qinghai Salt Lake Industry Group Co., Ltd., Golmud 816000, China
| | - Changping Li
- School of Environment and Civil Engineering, Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan, Guangdong 523106, China
| | - Sheng Dai
- Chemical Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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15
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Cao X, Zhao X, Hu J, Chen Z. First-principles investigation of the electronic properties of the Bi 2O 4(101)/BiVO 4(010) heterojunction towards more efficient solar water splitting. Phys Chem Chem Phys 2020; 22:2449-2456. [PMID: 31939946 DOI: 10.1039/c9cp06443e] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
First-principles calculations based on density functional theory were carried out to explore the geometric structure, light absorption, charge separation, over-potential and stability of Bi2O4 (101)/BiVO4 (010) heterojunction. The results show that the formed heterojunction can improve visible light utilization and promote transfer of photo-generated holes from BiVO4 to Bi2O4. Furthermore, the Bi5+ site in the Bi2O4(101) surface is energetically more favorable as the photoanode for the oxygen evolution reaction (OER) than the Bi3+ sites in Bi2O4(101) and BiVO4(010). At the same time, it is also found that the Bi5+ in Bi2O4(101) are more stable than the Bi3+ due to the lower surface energy and stronger bond energy with neighbors. Therefore, forming the Bi2O4/BiVO4 heterojunction can effectively improve the activity and stability of BiVO4 for water splitting reactions.
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Affiliation(s)
- Xiaofei Cao
- School of Chemical Engineering, Northwest University, Xi'an, 710069, P. R. China.
| | - Xin Zhao
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
| | - Jun Hu
- School of Chemical Engineering, Northwest University, Xi'an, 710069, P. R. China.
| | - Zhong Chen
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
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16
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Khan I, Lan J, Gao M, Huang S, Wu C. Electron beam-induced changes in tips of multi-walled carbon nanotubes with/without Au nanoparticles. APPLIED NANOSCIENCE 2019. [DOI: 10.1007/s13204-019-01237-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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17
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Thickness-dependent photoelectric properties of MoS 2/Si heterostructure solar cells. Sci Rep 2019; 9:17381. [PMID: 31758067 PMCID: PMC6874606 DOI: 10.1038/s41598-019-53936-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Accepted: 10/01/2019] [Indexed: 11/18/2022] Open
Abstract
In order to obtain the optimal photoelectric properties of vertical stacked MoS2/Si heterostructure solar cells, we propose a theoretical model to address the relationship among film thickness, atomic bond identities and related physical quantities in terms of bond relaxation mechanism and detailed balance principle. We find that the vertical stacked MoS2/Si can form type II band alignment, and its photoelectric conversion efficiency (PCE) enhances with increasing MoS2 thickness. Moreover, the optimal PCE in MoS2/Si can reach 24.76%, inferring that a possible design way can be achieved based on the layered transition metal dichalcogenides and silicon.
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18
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Dong J, Ouyang G. Thickness-Dependent Semiconductor-to-Metal Transition in Molybdenum Tungsten Disulfide Alloy under Hydrostatic Pressure. ACS OMEGA 2019; 4:8641-8649. [PMID: 31459953 PMCID: PMC6648731 DOI: 10.1021/acsomega.9b00507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 04/09/2019] [Indexed: 06/10/2023]
Abstract
Layered two-dimensional transition-metal dichalcogenide (TMD) alloys with strong intralayer ionic-covalent bonds and weak interlayer van der Waals bonds have been extensively studied in recent years owing to their tunable electronic and optoelectronic properties. However, the relationship among atomic bond identities, band offset, and related semiconductor-to-metal transition in ternary alloys of TMDs with different thicknesses under hydrostatic pressure at the atomic level remains largely unexplored, despite the fact that it plays an important role in the functionality of TMD-based devices. In this work, we investigate the thickness-dependent band offset and semiconductor-to-metal transition in Mo(1-x)W x S2 with different thicknesses under hydrostatic pressure based on the atomic-bond-relaxation correlation mechanism. It was found that the compression ratio in the out-of-plane direction is significantly higher than that of in-plane, and the band shift and semiconductor-to-metal transition are significantly modulated by the hydrostatic pressure, number of layers, and composition. The theoretical predictions are consistent with the experimental observations and calculations, suggesting that our approach can be suitable for other layered TMDs.
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19
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He Y, Hu S, Han T, Chen X, Yu Y, Li T, Zhu W, Ouyang G. Suppression of the Auger Recombination Process in CdSe/CdS Core/Shell Nanocrystals. ACS OMEGA 2019; 4:9198-9203. [PMID: 31460008 PMCID: PMC6648246 DOI: 10.1021/acsomega.9b00926] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 05/15/2019] [Indexed: 05/24/2023]
Abstract
We investigate the Auger recombination (AR) rate in CdSe/CdS core/shell nanocrystals (NCs) under different interface confinements in terms of the interface bond relaxation mechanism and Fermi's golden rule. We find that the epitaxial layer of CdS can not only depress the influence of the Coulomb interaction between electrons and holes, but can also change the wave function and quantum confinement, resulting in the reduction of the AR rate. Moreover, the AR lifetime of CdSe/CdS core/shell NCs at a fixed entire dimension is lower than that of bare CdSe because of interface confinement of the wave function. A great drop of the AR rate can be achieved by adding an alloying layer that depresses the interface effect. Our predictions are in agreement with the available evidence, suggesting that the proposed approach could provide a general method to explore the AR process in core/shell NCs.
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Affiliation(s)
- Yan He
- College
of Science, Guangdong University of Petrochemical
Technology, Maoming, 525000 Guangdong, China
- Key
Laboratory of Low-Dimensional Quantum Structures and Quantum Control
of Ministry of Education, Synergetic Innovation Center for Quantum
Effects and Applications (SICQEA), Hunan
Normal University, Changsha 410081, China
| | - Sumei Hu
- College
of Science, Guangdong University of Petrochemical
Technology, Maoming, 525000 Guangdong, China
| | - Taikun Han
- College
of Science, Guangdong University of Petrochemical
Technology, Maoming, 525000 Guangdong, China
| | - Xingyuan Chen
- College
of Science, Guangdong University of Petrochemical
Technology, Maoming, 525000 Guangdong, China
| | - Yanxia Yu
- College
of Science, Guangdong University of Petrochemical
Technology, Maoming, 525000 Guangdong, China
| | - Tianle Li
- College
of Science, Guangdong University of Petrochemical
Technology, Maoming, 525000 Guangdong, China
| | - Weiling Zhu
- College
of Science, Guangdong University of Petrochemical
Technology, Maoming, 525000 Guangdong, China
| | - Gang Ouyang
- Key
Laboratory of Low-Dimensional Quantum Structures and Quantum Control
of Ministry of Education, Synergetic Innovation Center for Quantum
Effects and Applications (SICQEA), Hunan
Normal University, Changsha 410081, China
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20
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Cheng F, Lian L, Li L, Rao J, Li C, Qi T, Zhang Z, Zhang J, Gao Y. Hybrid Growth Modes of PbSe Nanocrystals with Oriented Attachment and Grain Boundary Migration. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2019; 6:1802202. [PMID: 31065525 PMCID: PMC6498134 DOI: 10.1002/advs.201802202] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 01/18/2019] [Indexed: 05/31/2023]
Abstract
The growth of nanocrystals has widely been researched recently through an in situ high-resolution transmission electron microscopy technique, which reveals the process of morphological and structural evolutions. For nanocrystals, the underlying growth modes are mostly determined by growth environment and crystal morphology. Here, the direct growth process of the PbSe nanocrystals via controlling the temperature is clearly observed. The results show that the PbSe nanocrystals start growth following oriented attachment growth mode, and then change to growth with grain boundary migration at moderate temperature as the heat activated nanocrystals gather together with decreased degree of freedom for crystal rotation. During the grain boundary migration, the smaller nanocrystals are inclined to be assimilated by larger ones through interfacial atom reconfigurations, which are observed to take place through strain mediated atom migration. The growth mode changes in different growth states with a hybrid growth mode of oriented attachment and grain boundary migration during the whole growth process.
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Affiliation(s)
- Feng Cheng
- Center for Nanoscale Characterization & DevicesWuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology1037 Luoyu RoadWuhanHubei430074China
| | - Linyuan Lian
- Engineering Research Center for Functional CeramicsMinistry of Education, School of Optical and Electronic InformationHuazhong University of Science and Technology1037 Luoyu RoadWuhanHubei430074China
| | - Luying Li
- Center for Nanoscale Characterization & DevicesWuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology1037 Luoyu RoadWuhanHubei430074China
| | - Jiangyu Rao
- Center for Nanoscale Characterization & DevicesWuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology1037 Luoyu RoadWuhanHubei430074China
| | - Chen Li
- Center for Nanoscale Characterization & DevicesWuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology1037 Luoyu RoadWuhanHubei430074China
| | - Tianyu Qi
- Center for Nanoscale Characterization & DevicesWuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology1037 Luoyu RoadWuhanHubei430074China
| | - Zhi Zhang
- School of PhysicsHuazhong University of Science and Technology1037 Luoyu RoadWuhanHubei430074China
| | - Jianbing Zhang
- Engineering Research Center for Functional CeramicsMinistry of Education, School of Optical and Electronic InformationHuazhong University of Science and Technology1037 Luoyu RoadWuhanHubei430074China
| | - Yihua Gao
- School of PhysicsHuazhong University of Science and Technology1037 Luoyu RoadWuhanHubei430074China
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21
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Yi SY, Song YG, Park JY, Suh JM, Kim GS, Shim YS, Yuk JM, Kim S, Jang HW, Ju BK, Kang CY. Morphological Evolution Induced through a Heterojunction of W-Decorated NiO Nanoigloos: Synergistic Effect on High-Performance Gas Sensors. ACS APPLIED MATERIALS & INTERFACES 2019; 11:7529-7538. [PMID: 30672291 DOI: 10.1021/acsami.8b18678] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Morphological evolution accompanying a surface roughening and preferred orientation is an effective way to realize a high-performance gas sensor because of its significant potential as a chemical catalyst through chemical potentials and atomic energy states. In this work, we investigated a heterojunction of double-side-W-decorated NiO nanoigloos fabricated through radio frequency sputtering and a soft-template method. Interestingly, a morphological evolution characterized by a pyramidal rough surface and the preferred orientation of the (111) plane was observed upon decorating the bare NiO nanoigloos with W. The underlying mechanism of the morphological evolution was precisely demonstrated based on the van der Drift competitive growth model originating from the oxygen transport and chemical strain in the lattice. The gas sensing properties of W-decorated NiO show an excellent NO2 response and selectivity when compared to other gases. In addition, high response stability was evaluated under interference gas and humidity conditions. The synergistic effects on the sensing performance were interpreted on the basis of the morphological evolution of W-decorated NiO nanoigloos.
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Affiliation(s)
- Seung Yeop Yi
- Center for Electronic Materials , Korea Institute of Science and Technology (KIST) , Seoul 02791 , Republic of Korea
| | - Young Geun Song
- Center for Electronic Materials , Korea Institute of Science and Technology (KIST) , Seoul 02791 , Republic of Korea
| | - Jae Yeol Park
- Department of Materials Science & Engineering , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea
| | - Jun Min Suh
- Department of Materials Science and Engineering, Research Institute of Advanced Materials , Seoul National University , Seoul 08826 , Republic of Korea
| | - Gwang Su Kim
- Center for Electronic Materials , Korea Institute of Science and Technology (KIST) , Seoul 02791 , Republic of Korea
| | - Young-Seok Shim
- Department of Materials Science & Engineering , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea
| | - Jong Min Yuk
- Department of Materials Science & Engineering , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea
| | - Sangtae Kim
- Center for Electronic Materials , Korea Institute of Science and Technology (KIST) , Seoul 02791 , Republic of Korea
| | - Ho Won Jang
- Department of Materials Science and Engineering, Research Institute of Advanced Materials , Seoul National University , Seoul 08826 , Republic of Korea
| | | | - Chong-Yun Kang
- Center for Electronic Materials , Korea Institute of Science and Technology (KIST) , Seoul 02791 , Republic of Korea
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22
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Chen H, Zang H, Li X, Zhao Y. Toward a Better Understanding of Hemiwicking: A Simple Model to Comprehensive Prediction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:2854-2864. [PMID: 30673251 DOI: 10.1021/acs.langmuir.8b03611] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The hemiwicking state has attracted much interest because of numerous important potential applications in inking, printing, boiling heat transfer, and condensation. However, the mechanism of the emergence of hemiwicking has not been well understood, especially the effects of geometry of patterned surfaces on the hemiwicking state has not been systematically investigated. Here, we presented a new method to study the critical conditions for hemiwicking on patterned surfaces. By minimizing the variation of the free energy, we obtain the corresponding stable height of the hemiwicking film and find that it is easier for a droplet to be in the hemiwicking state if the pillar surface has small spacing, large radius and height, and a small intrinsic contact angle. Our established model is applied to a flat-topped cylindrical pillar-patterned surface, and the modeling results are in well agreement with experiments and other existing theories. Besides, our model is also applied to other kinds of patterned surfaces including hemispherical-topped cylindrical and conical pillars, about which the other existing theories are deficient. Our theoretical results not only are in well agreement with the experimental observations but also provide some important predictions, which implies that the established model could be applicable to understanding the basic physical mechanism of the hemiwicking state and be useful in guiding the design and fabrication of hemiwicking surfaces.
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Affiliation(s)
- Huadong Chen
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics , South China Normal University , Guangzhou 510631 , China
| | - Hang Zang
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics , South China Normal University , Guangzhou 510631 , China
| | - Xinlei Li
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics , South China Normal University , Guangzhou 510631 , China
| | - Yanping Zhao
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics , South China Normal University , Guangzhou 510631 , China
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23
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Hu B, Yin Y, Zhong Z, Wu D, Liu G, Hong X. Cu@ZIF-8 derived inverse ZnO/Cu catalyst with sub-5 nm ZnO for efficient CO2 hydrogenation to methanol. Catal Sci Technol 2019. [DOI: 10.1039/c8cy02546k] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cu@ZIF-8 derived inverse ZnO/Cu with sub-5 nm ZnO acts as an efficient catalyst for CO2 hydrogenation to methanol.
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Affiliation(s)
- Bing Hu
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- P. R. China
| | - Yazhi Yin
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- P. R. China
| | - Zixin Zhong
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- P. R. China
| | - Dengdeng Wu
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- P. R. China
| | - Guoliang Liu
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- P. R. China
- Wuhan-Oxford Joint Catalysis Laboratory
| | - Xinlin Hong
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- P. R. China
- Wuhan-Oxford Joint Catalysis Laboratory
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24
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Zhang J, Fu Q, Cui Z, Xue Y. Size-dependent melting thermodynamic properties of selenium nanowires in theory and experiment. CrystEngComm 2019. [DOI: 10.1039/c8ce01466c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A new core–shell melting model of nanowires was proposed to explain the size effect on the melting thermodynamics of nanowires.
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Affiliation(s)
- Jianhua Zhang
- Department of Applied Chemistry
- Taiyuan University of Technology
- Taiyuan 030024
- P R China
| | - Qingshan Fu
- Department of Applied Chemistry
- Taiyuan University of Technology
- Taiyuan 030024
- P R China
| | - Zixiang Cui
- Department of Applied Chemistry
- Taiyuan University of Technology
- Taiyuan 030024
- P R China
| | - Yongqiang Xue
- Department of Applied Chemistry
- Taiyuan University of Technology
- Taiyuan 030024
- P R China
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25
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Tan S, Zhao Y, Dong J, Yang G, Ouyang G. Determination of optimum optoelectronic properties in vertically stacked MoS2/h-BN/WSe2 van der Waals heterostructures. Phys Chem Chem Phys 2019; 21:23179-23186. [DOI: 10.1039/c9cp04700j] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Inserting an insulator at the interface in vdW heterostructure solar cell unit can improve the photoelectric conversion efficiency, and the insulator has an optimal thickness.
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Affiliation(s)
- Shilin Tan
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education
- Synergetic Innovation Center for Quantum Effects and Applications (SICQEA)
- Hunan Normal University
- Changsha 410081
- China
| | - Yipeng Zhao
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education
- Synergetic Innovation Center for Quantum Effects and Applications (SICQEA)
- Hunan Normal University
- Changsha 410081
- China
| | - Jiansheng Dong
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education
- Synergetic Innovation Center for Quantum Effects and Applications (SICQEA)
- Hunan Normal University
- Changsha 410081
- China
| | - Guowei Yang
- State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, Nanotechnology Research Center
- School of Physics and Engineering
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Gang Ouyang
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education
- Synergetic Innovation Center for Quantum Effects and Applications (SICQEA)
- Hunan Normal University
- Changsha 410081
- China
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26
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Liao C, Zhao Y, Ouyang G. Strain-Modulated Band Engineering in Two-Dimensional Black Phosphorus/MoS 2 van der Waals Heterojunction. ACS OMEGA 2018; 3:14641-14649. [PMID: 31458144 PMCID: PMC6644261 DOI: 10.1021/acsomega.8b01767] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 10/15/2018] [Indexed: 05/27/2023]
Abstract
We investigate the band shift and band alignment of two-dimensional (2D) black phosphorus (BP)/MoS2 van der Waals heterojunction (vdW HJ) via uniaxial strain in terms of first-principles calculations and atomic-bond-relaxation method. We find that the band gap of 2D BP/MoS2 HJ decreases linearly with applied tensile strain and Mo-S bond breaks down at 10% tensile strain. Meanwhile, the band gap slightly increases and then monotonically decreases under compressive strain and there appears a semiconductor-to-metal transition at -11 and -12% strain in the y and x directions, respectively. Moreover, 2D BP/MoS2 HJ maintains type-II band alignment for strain applied in the y direction whereas type-II/I band transition appears at -5% strain in the x direction. Moreover, we propose an analytical model to address the strain-modulated band engineering of 2D BP/MoS2 vdW HJ at the atomic level. Our results suggest a promising way to explain the intrinsic mechanism of strain engineering and manipulate the electronic properties of 2D vdW HJs.
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27
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Ma YL, Zhu K, Li M. Size, dimensionality and composition effects on the Debye temperature of nanocrystals. Phys Chem Chem Phys 2018; 20:27539-27544. [PMID: 30370906 DOI: 10.1039/c8cp04935a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
As an important property for reflecting the binding forces between atoms, the Debye temperature of nanocrystals can be tuned by size, dimensionality and composition. In order to understand how these factors influence the Debye temperature, in this contribution, a new nanothermodynamic model without any adjustable parameter was established by considering the surface stress and bond number simultaneously. As expected, the Debye temperature decreases with a decrease in size if the dimensionality is given, while the size effect on nanowires is stronger than that on thin films and weaker than that on nanoparticles. It is also found that the Debye temperature of nanoalloys decreases with the increase of the component with smaller cohesive energy for the same size and dimensionality. The validity of the model is proved by the good consistency between the model predictions and experimental and computer simulation results.
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Affiliation(s)
- Yan-Li Ma
- School of Physics and Electric Information, Huaibei Normal University, Huaibei, 235000, China.
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28
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Khan I, He B, Huang S, Wu C. Multi-walled carbon nanotubes under focused electron beam: metal passivation effect and nanoscaled curvature effect. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:385302. [PMID: 30095438 DOI: 10.1088/1361-648x/aad982] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The elongation and length contraction in multi-walled carbon nanotubes without/with metal (Au) nanoparticles under focused electron beam irradiation is in situ studied experimentally at room temperature with transmission electron microscopy. It is observed that the plastic flow and direct evaporation of carbon atoms strongly rely on the nanoscaled negative curvature and surface energy of the nanotubes. The multi-walled carbon nanotubes without metal nanoparticles shrink and elongate by the diffusion and plastic flow of carbon atoms along the shells in the tube axis direction by self contraction of shells. In contrast, multi-walled carbon nanotubes with metal nanoparticles shrink and reduce their lengths by direct evaporation (sputtering) of carbon atoms into the free space under passivation by the metal nanoparticles. Thus, experimental demonstration is provided that the non-uniform structural evolution process in multi-walled carbon nanotubes induced fleetly by the nanoscaled negative curvature effect under athermal activation effect of electron beam passivates by metal nanoparticles.
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Affiliation(s)
- Imran Khan
- Institute of Biomimetics and Soft Matter, Fujian Provincial Key Laboratory of Semiconductors and Applications, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Department of Physics and Jiujiang Research Institute, Xiamen University, Xiamen 361005, People's Republic of China
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29
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Liu S, Liu Z. Hybridization induced metallic and magnetic edge states in noble transition-metal-dichalcogenides of PtX 2 (X = S, Se) nanoribbons. Phys Chem Chem Phys 2018; 20:21441-21446. [PMID: 30087962 DOI: 10.1039/c8cp03640c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The semiconducting transition metal dichalcogenide (TMD) 2H-MoS2 zigzag nanoribbon has two different edges, and only one edge shows metallic properties due to symmetric protection. In the present work, a nanoribbon with two parallel metallic and magnetic edges was designed from a noble TMD 1T-PtX2 (X = S, Se) by employing first-principles calculations based on density functional theory (DFT). The band structure, density of states (DOS), and simulated scanning tunneling microscopy (STM) of three possible zigzag edge states of monolayer semiconducting PtX2 were systematically studied. Detailed calculations showed that the Pt-terminated edge state among the three zigzag edge states was metallic. The Pt-terminated edge state designed from monolayer PtS2 showed both metallic and magnetic properties. These metallic and magnetic properties were mainly contributed to by the hybridization of the 5d orbitals of Pt atoms and the 3p orbitals of S atoms located at the edges. However, hybridization of the 5d orbitals of Pt atoms and the 4p orbitals of Se atoms located at the edges does not bring magnetic properties to the zigzag metallic PtSe2 nanoribbon. The interesting electronic and magnetic properties of 1T-PtX2 nanoribbons indicate that they may have promising applications as zigzag nanoribbons in spin electronics and photovoltaic cells.
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Affiliation(s)
- Shan Liu
- Department of Physics and Key Laboratory for Low-Dimensional Structures and Quantum Manipulation (Ministry of Education), Hunan Normal University, Changsha 410081, China.
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30
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A novel silane coupling agent with peroxy groups used as an initiator in the graft polymerization of AN or MMA on nano-TiO2. CHEMICAL PAPERS 2018. [DOI: 10.1007/s11696-018-0524-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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31
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Zhou J, Zhang X, Sun J, Dang Z, Li J, Li X, Chen T. The effects of surface topography of nanostructure arrays on cell adhesion. Phys Chem Chem Phys 2018; 20:22946-22951. [DOI: 10.1039/c8cp03538e] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The effects of geometry and surface density distribution of nanopillars on cell adhesion studied by a quantitative thermodynamic model showed that high (low) surface distribution density and large (small) radius result in the “Top” (“Bottom”) mode.
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Affiliation(s)
- Jing Zhou
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science
- College of Biophotonics
- South China Normal University
- Guangzhou 510631
- China
| | - Xiaowei Zhang
- State Key Laboratory of Environment-friendly Energy Materials
- Southwest University of Science and Technology
- Mianyang 621010
- China
| | - Jizheng Sun
- College of Life Science
- Taishan Medical University
- Taian 271016
- China
| | - Zechun Dang
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science
- College of Biophotonics
- South China Normal University
- Guangzhou 510631
- China
| | - Jinqi Li
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science
- College of Biophotonics
- South China Normal University
- Guangzhou 510631
- China
| | - Xinlei Li
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science
- College of Biophotonics
- South China Normal University
- Guangzhou 510631
- China
| | - Tongsheng Chen
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science
- College of Biophotonics
- South China Normal University
- Guangzhou 510631
- China
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32
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Kim BH, Yang J, Lee D, Choi BK, Hyeon T, Park J. Liquid-Phase Transmission Electron Microscopy for Studying Colloidal Inorganic Nanoparticles. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:1703316. [PMID: 29178589 DOI: 10.1002/adma.201703316] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Revised: 09/01/2017] [Indexed: 05/26/2023]
Abstract
For the past few decades, nanoparticles of various sizes, shapes, and compositions have been synthesized and utilized in many different applications. However, due to a lack of analytical tools that can characterize structural changes at the nanoscale level, many of their growth and transformation processes are not yet well understood. The recently developed technique of liquid-phase transmission electron microscopy (TEM) has gained much attention as a new tool to directly observe chemical reactions that occur in solution. Due to its high spatial and temporal resolution, this technique is widely employed to reveal fundamental mechanisms of nanoparticle growth and transformation. Here, the technical developments for liquid-phase TEM together with their application to the study of solution-phase nanoparticle chemistry are summarized. Two types of liquid cells that can be used in the high-vacuum conditions required by TEM are discussed, followed by recent in situ TEM studies of chemical reactions of colloidal nanoparticles. New findings on the growth mechanism, transformation, and motion of nanoparticles are subsequently discussed in detail.
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Affiliation(s)
- Byung Hyo Kim
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
| | - Jiwoong Yang
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
| | - Donghoon Lee
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
| | - Back Kyu Choi
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
| | - Taeghwan Hyeon
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
| | - Jungwon Park
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
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33
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Xiao K, Zhao Y, Ouyang G, Li X. Modeling the Effects of Nanopatterned Surfaces on Wetting States of Droplets. NANOSCALE RESEARCH LETTERS 2017; 12:309. [PMID: 28449550 PMCID: PMC5406321 DOI: 10.1186/s11671-017-2086-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 04/16/2017] [Indexed: 05/25/2023]
Abstract
An analytic thermodynamic model has been established to quantitatively investigate the wetting states of droplets on nanopatterned surfaces. Based on the calculations for the free energies of droplets with the Wenzel state and the Cassie-Baxter state, it is found that the size and shape of nanostructured surfaces play crucial roles in wetting states. In detail, for nanohole-patterned surfaces, the deep and thin nanoholes lead to the Cassie-Baxter state, and contrarily, the shallow and thick nanoholes result in the Wenzel state. However, the droplets have the Wenzel state on the patterned surfaces with small height and radii nanopillars and have the Cassie-Baxter state when the height and radii of nanopillars are large. Furthermore, the intuitive phase diagrams of the wetting states of the droplet in the space of surface geometrical parameters are obtained. The theoretical results are in good agreement with the experimental observations and reveal physical mechanisms involved in the effects of nanopatterned surfaces on wetting states, which implies that these studies may provide useful guidance to the conscious design of patterned surfaces to control the wetting states of droplets.
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Affiliation(s)
- Ke Xiao
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, 510631, China
| | - Yanping Zhao
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, 510631, China
| | - Gang Ouyang
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Synergetic Innovation Center for Quantum Effects and Applications (SICQEA), Hunan Normal University, Changsha, 410081, China
| | - Xinlei Li
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, 510631, China.
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34
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Yu WB, Ouyang G. Geometry-dependent band shift and dielectric modification of nanoporous Si nanowires. Sci Rep 2017; 7:14456. [PMID: 29089540 PMCID: PMC5663955 DOI: 10.1038/s41598-017-14647-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Accepted: 10/09/2017] [Indexed: 11/30/2022] Open
Abstract
In order to obtain a detailed understanding of the modulation of electronic properties in nanoporous Si (np-Si) nanowires with containing ordered, nanometer-sized cylindrical pores, we propose a theoretical method to clarify the band shift and associated with the dielectric modification determined by the geometrical parameters, including nanowire diameter, pore size, pore spacing and porosity, in terms of size-dependent surface energy and atomic-bond-relaxation correlation mechanism. Our results reveal that the self-equilibrium strain induced by the atoms located at inner and outer surfaces with high ratio of under-coordinated atoms as well as elastic interaction among pores in np-Si nanowires play the dominant role in the bandgap shift and dielectric depression. The tunable electronic properties of np-Si nanowires with negative curvature make them attractive for nanoelectronic and optoelectronic devices.
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Affiliation(s)
- W B Yu
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Synergetic Innovation Center for Quantum Effects and Applications (SICQEA), Hunan Normal University, Changsha, 410081, China
| | - G Ouyang
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Synergetic Innovation Center for Quantum Effects and Applications (SICQEA), Hunan Normal University, Changsha, 410081, China.
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35
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Ramade J, Langlois C, Pellarin M, Piccolo L, Lebeault MA, Epicier T, Aouine M, Cottancin E. Tracking the restructuring of oxidized silver-indium nanoparticles under a reducing atmosphere by environmental HRTEM. NANOSCALE 2017; 9:13563-13574. [PMID: 28876014 DOI: 10.1039/c7nr02986a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Multimetallic nano-alloys display a structure and consequently physicochemical properties evolving in a reactive environment. Following and understanding this evolution is therefore crucial for future applications in gas sensing and heterogeneous catalysis. In view hereof, the structural evolution of oxidized Ag25In75 bimetallic nanoparticles under varying H2 partial pressures (PH2) and substrate temperatures (Ts) has been investigated in real-time through environmental transmission microscopy (E-TEM) while maintaining the atomic resolution. Small Ag25In75 bimetallic nanoparticles, produced by laser vaporization, are found (after air transfer) to contain an indium-oxide shell surrounding a silver-rich alloyed phase. For high PH2 and Ts, the direct reduction of the indium oxide shell, immediately followed by the melting or the diffusion onto the carbon substrate of the reduced indium atoms, is found to be the dominant mechanism. This reduction is concomitant with the growth of the core, indicating a partial diffusion of indium atoms from the shell towards the particle volume. The "surviving" particles therefore consist of a silver-indium alloy, very stable and remarkably resistant against oxidation contrary to native clusters. Interestingly, in the (PH2, Ts) space, the transition from "soft" (core-shell particles for low (PH2, Ts) values) to "strong" reduction conditions (silver-rich alloys for high (PH2, Ts) products) defines an intermediate domain where the preferred formation of Janus structures is detected. These results are discussed in terms of thermodynamic driving forces in relation to alloying and interface energies. This work shows the potential of high-resolution ETEM for unravelling the mechanisms of nanoparticle reorganization in a chemically reactive environment.
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Affiliation(s)
- Julien Ramade
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France.
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He LB, Zhang L, Tan XD, Tang LP, Xu T, Zhou YL, Ren ZY, Wang Y, Teng CY, Sun LT, Nie JF. Surface Energy and Surface Stability of Ag Nanocrystals at Elevated Temperatures and Their Dominance in Sublimation-Induced Shape Evolution. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1700743. [PMID: 28556596 DOI: 10.1002/smll.201700743] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 04/07/2017] [Indexed: 06/07/2023]
Abstract
The surface energy and surface stability of Ag nanocrystals (NCs) are under debate because the measurable values of the surface energy are very inconsistent, and the indices of the observed thermally stable surfaces are apparently in conflict. To clarify this issue, a transmission electron microscope is used to investigate these problems in situ with elaborately designed carbon-shell-capsulated Ag NCs. It is demonstrated that the {111} surfaces are still thermally stable at elevated temperatures, and the victory of the formation of {110} surfaces over {111} surfaces on the Ag NCs during sublimation is due to the special crystal geometry. It is found that the Ag NCs behave as quasiliquids during sublimation, and the cubic NCs represent a featured shape evolution, which is codetermined by both the wetting equilibrium at the Ag-C interface and the relaxation of the system surface energy. Small Ag NCs (≈10 nm) no longer maintain the wetting equilibrium observed in larger Ag NCs, and the crystal orientations of ultrafine Ag NCs (≈6 nm) can rotate to achieve further shape relaxation. Using sublimation kinetics, the mean surface energy of Ag NCs at 1073 K is calculated to be 1.1-1.3 J m-2 .
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Affiliation(s)
- Long-Bing He
- SEU-FEI Nano-Pico Center, Key Lab of MEMS of MOE, Southeast University, Nanjing, 210096, P. R. China
| | - Lei Zhang
- SEU-FEI Nano-Pico Center, Key Lab of MEMS of MOE, Southeast University, Nanjing, 210096, P. R. China
| | - Xiao-Dong Tan
- SEU-FEI Nano-Pico Center, Key Lab of MEMS of MOE, Southeast University, Nanjing, 210096, P. R. China
| | - Lu-Ping Tang
- SEU-FEI Nano-Pico Center, Key Lab of MEMS of MOE, Southeast University, Nanjing, 210096, P. R. China
| | - Tao Xu
- SEU-FEI Nano-Pico Center, Key Lab of MEMS of MOE, Southeast University, Nanjing, 210096, P. R. China
| | - Yi-Long Zhou
- SEU-FEI Nano-Pico Center, Key Lab of MEMS of MOE, Southeast University, Nanjing, 210096, P. R. China
| | - Zhan-Yong Ren
- China Aero-Polytechnology Establishment, Beijing, 100028, P. R. China
| | - Yun Wang
- China Aero-Polytechnology Establishment, Beijing, 100028, P. R. China
| | - Chun-Yu Teng
- China Aero-Polytechnology Establishment, Beijing, 100028, P. R. China
| | - Li-Tao Sun
- SEU-FEI Nano-Pico Center, Key Lab of MEMS of MOE, Southeast University, Nanjing, 210096, P. R. China
| | - Jian-Feng Nie
- Department of Materials Science and Engineering, Monash University, Victoria, 3800, Australia
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Kang NR, Kim YC, Jeon H, Kim SK, Jang JI, Han HN, Kim JY. Wall-thickness-dependent strength of nanotubular ZnO. Sci Rep 2017; 7:4327. [PMID: 28659633 PMCID: PMC5489488 DOI: 10.1038/s41598-017-04696-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Accepted: 05/18/2017] [Indexed: 11/29/2022] Open
Abstract
We fabricate nanotubular ZnO with wall thickness of 45, 92, 123 nm using nanoporous gold (np-Au) with ligament diameter at necks of 1.43 μm as sacrificial template. Through micro-tensile and micro-compressive testing of nanotubular ZnO structures, we find that the exponent m in \documentclass[12pt]{minimal}
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\begin{document}$$\bar{\sigma }\propto {\bar{\rho }}^{m}$$\end{document}σ¯∝ρ¯m, where \documentclass[12pt]{minimal}
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\begin{document}$$\bar{\sigma }$$\end{document}σ¯ is the relative strength and \documentclass[12pt]{minimal}
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\begin{document}$$\bar{\rho }$$\end{document}ρ¯ is the relative density, for tension is 1.09 and for compression is 0.63. Both exponents are lower than the value of 1.5 in the Gibson-Ashby model that describes the relation between relative strength and relative density where the strength of constituent material is independent of external size, which indicates that strength of constituent ZnO increases as wall thickness decreases. We find, based on hole-nanoindentation and glazing incidence X-ray diffraction, that this wall-thickness-dependent strength of nanotubular ZnO is not caused by strengthening of constituent ZnO by size reduction at the nanoscale. Finite element analysis suggests that the wall-thickness-dependent strength of nanotubular ZnO originates from nanotubular structures formed on ligaments of np-Au.
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Affiliation(s)
- Na-Ri Kang
- School of Materials Science and Engineering, UNIST (Ulsan National Institute of Science and Technology), Ulsan, 44919, Republic of Korea
| | - Young-Cheon Kim
- School of Materials Science and Engineering, UNIST (Ulsan National Institute of Science and Technology), Ulsan, 44919, Republic of Korea
| | - Hansol Jeon
- School of Materials Science and Engineering, UNIST (Ulsan National Institute of Science and Technology), Ulsan, 44919, Republic of Korea
| | - Seong Keun Kim
- Center for Electronic Materials, KIST (Korea Institute of Science and Technology), Seoul, 02792, Republic of Korea
| | - Jae-Il Jang
- Division of Materials Science and Engineering, Hanyang University, Seoul, 04763, Republic of Korea
| | - Heung Nam Han
- School of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Ju-Young Kim
- School of Materials Science and Engineering, UNIST (Ulsan National Institute of Science and Technology), Ulsan, 44919, Republic of Korea. .,KIST-UNIST Ulsan Center for Convergent Materials, UNIST, Ulsan, 44919, Republic of Korea.
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38
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Pinto OA, López de Mishima BA, Leiva EPM, Oviedo OA. Simulation of selective thermodynamic deposition in nanoholes. Phys Chem Chem Phys 2017; 19:1601-1609. [PMID: 27990548 DOI: 10.1039/c6cp05718g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The deposition of particles in nanoholes is analyzed, taking into account the curvature of their inner walls. Different lattice-gas models of the nanoholes are considered. The heterogeneous surface are shaped from a (100)-surface where a nanohollow are incorporated with parallelepiped or polyhedral geometry. Several deposition stages are identified as a function of the degree of curvature of the inner walls of the nanoholes. The Monte Carlo technique in the grand canonical ensemble is used to calculate isotherms, isosteric heats, energies per site and other thermodynamic properties. This study is based on different magnitudes of the interaction energies between the particles being deposited and those surrounding the nanohole.
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Affiliation(s)
- O A Pinto
- Instituto de Bionanotecnología (INBIONATEC-CONICET), Universidad Nacional de Santiago del Estero, RN 9 Km 1125 Villa el Zanjón, Santiago del Estero, G4206XCP, Argentina
| | - B A López de Mishima
- Instituto de Bionanotecnología (INBIONATEC-CONICET), Universidad Nacional de Santiago del Estero, RN 9 Km 1125 Villa el Zanjón, Santiago del Estero, G4206XCP, Argentina
| | - E P M Leiva
- Instituto de Investigaciones en Fisico-química de Córdoba (INFIQC-CONICET), Departamento de Química Teórica y Computacional, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, X5000HUA, Argentina.
| | - O A Oviedo
- Instituto de Investigaciones en Fisico-química de Córdoba (INFIQC-CONICET), Departamento de Química Teórica y Computacional, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, X5000HUA, Argentina.
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39
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Edge or interface effect on bandgap openings in graphene nanostructures: A thermodynamic approach. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.06.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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40
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Abstract
The quest to design and fabricate new antibacterial surfaces is an important task to meet the urgent demands of biomedical applications. Recently, a mechanical mechanism for killing adherent bacteria was discovered on nanopatterned surfaces, but there is a lack of understanding of the bactericidal mechanism. Here we present a quantitative thermodynamic model to study the bactericidal mechanism of nanopatterned surfaces through analyzing the total free energy change of bacterial cells. By comparing the bacterial cells on a flat surface and nanopatterned surface, our theoretical results reveal that cicada wing-like nanopatterned surfaces have more effective bactericidal properties than flat surfaces because a patterned surface leads to a drastic increase of the contact adhesion area. Our model also reveals some details of the influence mechanism, and gives some important information about how to improve the bactericidal properties through designing the morphology of the patterned surface.
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Affiliation(s)
- Xinlei Li
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, P. R. China.
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41
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Lazzari R, Goniakowski J, Cabailh G, Cavallotti R, Trcera N, Lagarde P, Jupille J. Surface and Epitaxial Stresses on Supported Metal Clusters. NANO LETTERS 2016; 16:2574-2579. [PMID: 26943368 DOI: 10.1021/acs.nanolett.6b00143] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Surface stress and energy are basic quantities in the Gibbsian formulation of the thermodynamic description of surfaces which is central in the formation and long-term behavior of materials at the nanoscale. However, their size dependence is a puzzling issue. It is even unclear whether they decrease or increase with decreasing particle size. In addition, for a given metal, estimates often span over an order of magnitude, far apart from bulk data, which, in the absence of any explicit size-dependence rule, escapes understanding. Here, we combine X-ray absorption and nanoplasmonics data with atomistic simulation to describe α-Al2O3(0001)-supported silver particles. By comparison to MgO(001)-supported and embedded silver, we distinguish epitaxial and surface stress. The latter is shown to dominate above 3 nm in size. Since the observation mostly relies on surface/bulk ratio, a metal-independent picture emerges that is expected to have far-reaching consequences for the understanding of the energetics of nanoparticles.
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Affiliation(s)
- Rémi Lazzari
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7588 , Institut des NanoSciences de Paris, F-75005 Paris, France
| | - Jacek Goniakowski
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7588 , Institut des NanoSciences de Paris, F-75005 Paris, France
| | - Gregory Cabailh
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7588 , Institut des NanoSciences de Paris, F-75005 Paris, France
| | - Rémi Cavallotti
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7588 , Institut des NanoSciences de Paris, F-75005 Paris, France
| | - Nicolas Trcera
- Synchrotron SOLEIL, L'Orme des Merisiers, St-Aubin, BP48, F-91192 Gif sur Yvette, France
| | - Pierre Lagarde
- Synchrotron SOLEIL, L'Orme des Merisiers, St-Aubin, BP48, F-91192 Gif sur Yvette, France
| | - Jacques Jupille
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7588 , Institut des NanoSciences de Paris, F-75005 Paris, France
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42
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Gao P, Wu Q, Li X, Ma H, Zhang H, Volinsky AA, Qiao L, Su Y. Size-dependent concentrations of thermal vacancies in solid films. Phys Chem Chem Phys 2016; 18:22661-7. [DOI: 10.1039/c6cp03419e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Size-dependent vacancy concentration in thin films at 300 K.
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Affiliation(s)
- Panpan Gao
- Corrosion and Protection Center
- Key Laboratory for Environmental Fracture (MOE)
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Quan Wu
- Corrosion and Protection Center
- Key Laboratory for Environmental Fracture (MOE)
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Xi Li
- Corrosion and Protection Center
- Key Laboratory for Environmental Fracture (MOE)
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Hongxin Ma
- Corrosion and Protection Center
- Key Laboratory for Environmental Fracture (MOE)
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Hao Zhang
- Department of Chemical and Materials Engineering
- University of Alberta
- Edmonton
- Canada
| | - Alex A. Volinsky
- Department of Mechanical Engineering
- University of South Florida
- Tampa FL 33620
- USA
| | - Lijie Qiao
- Corrosion and Protection Center
- Key Laboratory for Environmental Fracture (MOE)
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Yanjing Su
- Corrosion and Protection Center
- Key Laboratory for Environmental Fracture (MOE)
- University of Science and Technology Beijing
- Beijing 100083
- China
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43
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Ali S, Myasnichenko VS, Neyts EC. Size-dependent strain and surface energies of gold nanoclusters. Phys Chem Chem Phys 2016; 18:792-800. [DOI: 10.1039/c5cp06153a] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Calculation of size-dependent strain and surface energies of gold nanoparticles.
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Affiliation(s)
- S. Ali
- Research Group PLASMANT
- Department of Chemistry
- University of Antwerp
- 2610 Wilrijk-Antwerp
- Belgium
| | | | - E. C. Neyts
- Research Group PLASMANT
- Department of Chemistry
- University of Antwerp
- 2610 Wilrijk-Antwerp
- Belgium
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44
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Acosta-Domínguez L, Hernández-Sánchez H, Gutiérrez-López GF, Alamilla-Beltrán L, Azuara E. Modification of the soy protein isolate surface at nanometric scale and its effect on physicochemical properties. J FOOD ENG 2016. [DOI: 10.1016/j.jfoodeng.2015.07.031] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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45
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Lozovoy KA, Kokhanenko AP, Voitsekhovskii AV. Generalized Muller-Kern formula for equilibrium thickness of a wetting layer with respect to the dependence of the surface energy of island facets on the thickness of the 2D layer. Phys Chem Chem Phys 2015; 17:30052-6. [PMID: 26499174 DOI: 10.1039/c5cp05192d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Experimental results indicate a particular importance of such a value as the equilibrium thickness of the wetting layer during epitaxial growth according to the Stranski-Krastanow mechanism in systems with a lattice mismatch. In this paper the change in free energy during the transition of atoms from the wetting layer to the island in such systems is considered. Recent experimental results also show that the surface energy of the island's facets depends upon the thickness of the deposited material. So, in this paper the equilibrium thickness of the wetting layer, at which transition from 2D to 3D growth becomes energetically favorable, is calculated with the assumption that the specific energy of the island's facets depends upon the wetting layer thickness. In this approximation a new generalized Muller-Kern formula is obtained. As an illustration of the proposed method, an example of a numerical calculation according to the new formula for the material system of germanium on a silicon (001) surface is given. The result for the found equilibrium thickness of the wetting layer is rather unexpected since it differs from the value obtained in the bounds of the traditional Muller-Kern model.
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Affiliation(s)
- Kirill A Lozovoy
- Department of Radiophysics, National Research Tomsk State University, 36 Lenin Av., Tomsk 634050, Russian Federation.
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46
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Ozel T, Ashley MJ, Bourret GR, Ross MB, Schatz GC, Mirkin CA. Solution-Dispersible Metal Nanorings with Deliberately Controllable Compositions and Architectural Parameters for Tunable Plasmonic Response. NANO LETTERS 2015; 15:5273-8. [PMID: 26133945 DOI: 10.1021/acs.nanolett.5b01594] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
We report a template-based technique for the preparation of solution-dispersible nanorings composed of Au, Ag, Pt, Ni, and Pd with control over outer diameter (60-400 nm), inner diameter (25-230 nm), and height (40 nm to a few microns). Systematic and independent control of these parameters enables fine-tuning of the three characteristic localized surface plasmon resonance modes of Au nanorings and the resulting solution-based extinction spectra from the visible to the near-infrared. This synthetic approach provides a new pathway for solution-based investigations of surfaces with negative curvature.
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Affiliation(s)
- Tuncay Ozel
- †Department of Materials Science and Engineering, ‡Department of Chemical and Biological Engineering, and §Department of Chemistry, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208, United States
| | - Michael J Ashley
- †Department of Materials Science and Engineering, ‡Department of Chemical and Biological Engineering, and §Department of Chemistry, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208, United States
| | - Gilles R Bourret
- †Department of Materials Science and Engineering, ‡Department of Chemical and Biological Engineering, and §Department of Chemistry, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208, United States
| | - Michael B Ross
- †Department of Materials Science and Engineering, ‡Department of Chemical and Biological Engineering, and §Department of Chemistry, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208, United States
| | - George C Schatz
- †Department of Materials Science and Engineering, ‡Department of Chemical and Biological Engineering, and §Department of Chemistry, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208, United States
| | - Chad A Mirkin
- †Department of Materials Science and Engineering, ‡Department of Chemical and Biological Engineering, and §Department of Chemistry, and International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208, United States
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47
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Luo S, Yu WB, He Y, Ouyang G. Size-dependent optical absorption modulation of Si/Ge and Ge/Si core/shell nanowires with different cross-sectional geometries. NANOTECHNOLOGY 2015; 26:085702. [PMID: 25649268 DOI: 10.1088/0957-4484/26/8/085702] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We present an atomic-level and quantitative study of the absorption properties in Si/Ge and Ge/Si core/shell nanowires (CSNWs) along [110] direction with different cross-sectional geometries using the atomic bond relaxation method. We find that the strain existing in self-equilibrium state of CSNWs and associated with elastic energy originating from interface mismatch and surface relaxation affect the band shift and absorption properties. Compared to the CSNWs with tetragonal, hexagonal and circular shapes, the triangular CSNWs have the largest band gap shift at a fixed strain and the smallest absorption coefficient at a determinate incident light wavelength. The tunable absorption property, realized by controlling the size and geometry structure, could be helpful for nanoelectronic applications.
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Affiliation(s)
- S Luo
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education and Department of Physics, Hunan Normal University, Changsha 410081, People's Republic of China
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48
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Wang Y, He J, Liu C, Chong WH, Chen H. Thermodynamik und Kinetik in der Nanosynthese. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402986] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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49
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Wang Y, He J, Liu C, Chong WH, Chen H. Thermodynamics versus Kinetics in Nanosynthesis. Angew Chem Int Ed Engl 2014; 54:2022-51. [DOI: 10.1002/anie.201402986] [Citation(s) in RCA: 329] [Impact Index Per Article: 32.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2014] [Indexed: 12/29/2022]
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50
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Perera N, Karunathilake N, Chhetri P, Alpuche-Aviles MA. Electrochemical Detection and Sizing of Colloidal ZnO Nanoparticles. Anal Chem 2014; 87:777-84. [DOI: 10.1021/ac5037445] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Neluni Perera
- Department of Chemistry, University of Nevada, Reno, Nevada 89557, United States
| | - Nelum Karunathilake
- Department of Chemistry, University of Nevada, Reno, Nevada 89557, United States
| | - Pushpa Chhetri
- Department of Chemistry, University of Nevada, Reno, Nevada 89557, United States
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