Abstract
Ag nanowires are considered to be the promising candidates for future electronic circuit owing to the excellent electrical and thermal properties, with the miniaturization of electronics devices into nanometer scale. Though interconnect technology between Ag nanowires (Ag NWs) is essential for nanofunctional devices, it lacks sufficient experimental data. Besides, the determination of Ag NW interconnection configuration is experimentally difficult to do for lacking the sufficient investigation of atomic configuration evolution during nanojoining process. So the nanojoining between the crossed Ag NWs with the same diameter of 2 nm and different lengths was performed by molecular dynamics simulation to explain the unclear nanojoining mechanism based on thermal effect. As the simulation results present, when the nanojoining temperature is relatively high, though the Ag NWs are connected with the interpenetration effect of Ag atoms at the crossed nanojunction area, the nanostructures of Ag NWs have been seriously deformed with shorter length and larger diameter, showing relatively more obvious melting characteristics based on the chaotic atomic structures. If the temperature is reduced to 300 K as cold welding, the crossed Ag NWs can be partially contacted with the partial mixture of Ag atoms, and the interstices always exist between the Si surface and the upper Ag nanowire. In addition, the obvious dislocation phenomenon will appear and evolve as time goes on. Consequently, the dominant mechanism was revealed for providing a fundamental understanding of how ‘hot’ and ‘cold’ welding technology affects the atomic contact configuration, respectively.
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Acknowledgments
This project was supported by National Natural Science Foundation of China (51505371), Hong Kong Scholars Program (XJ2015038), China Postdoctoral Science Foundation (2014M562397, 2015T81018), Fundamental Research Funds for the Central Universities (xjj2015009), and Open Research Fund of Key Laboratory of High Performance Complex Manufacturing, Central South University (Kfkt2015-06). All the authors gratefully acknowledge their support.
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Cui, J., Wang, X., Barayavuga, T. et al. Nanojoining of crossed Ag nanowires: a molecular dynamics study. J Nanopart Res 18, 175 (2016). https://doi.org/10.1007/s11051-016-3479-x
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DOI: https://doi.org/10.1007/s11051-016-3479-x