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Journal of Nanoscience Letters 2014, 4: 13
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Research Article
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Molecular dynamics simulations on cold welding of gold nanowires
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Cheng-Da Wua, Yi-Jun Huanga, Te-Hua Fanga, Jen-Fin Linb, Lucio Riccobonoc
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a Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan
b Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan
c Department of Sciences of the Civil Engineering and Architecture, Polytechnic of Bari, Bari 70125, Italy
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Abstract |
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The mechanism of cold welding of Au nanowires (NWs) is studied using molecular dynamics simulations based on the second-moment approximation of the many-body tight-binding potential. The effects of head-to-head and side-to-side contacts are investigated by varying various interferences (distances between two NWs when they begin to interact). Simulation results show that welding using head-to-head contact is better than that using side-to-side contact. For head-to-head contact, the weld naturally forms without an interface under low pressure through diffusions between the surface atoms of two NWs. Welding using a large interference leads to the formation of a disordered structure inside NWs. For side-to-side contact, defects or damage easily occurs because a much larger pressure is required for overcoming adhesion.
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Keywords |
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Cold welding; Nanowire; Gold; Nanotribology; Molecular dynamics
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