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Title: Impacts of atomistic coating on thermal conductivity of germanium nanowires
Authors: Chen, J.
Zhang, G.
Li, B. 
Keywords: atomistic coating
germanium nanowires
molecular dynamics simulations
Thermal conductivity
Issue Date: 13-Jun-2012
Source: Chen, J., Zhang, G., Li, B. (2012-06-13). Impacts of atomistic coating on thermal conductivity of germanium nanowires. Nano Letters 12 (6) : 2826-2832. ScholarBank@NUS Repository.
Abstract: By using nonequilibrium molecular dynamics simulations, we demonstrated that thermal conductivity of germanium nanowires can be reduced more than 25% at room temperature by atomistic coating. There is a critical coating thickness beyond which thermal conductivity of the coated nanowire is larger than that of the host nanowire. The diameter-dependent critical coating thickness and minimum thermal conductivity are explored. Moreover, we found that interface roughness can induce further reduction of thermal conductivity in coated nanowires. From the vibrational eigenmode analysis, it is found that coating induces localization for low-frequency phonons, while interface roughness localizes the high-frequency phonons. Our results provide an available approach to tune thermal conductivity of nanowires by atomic layer coating. © 2012 American Chemical Society.
Source Title: Nano Letters
ISSN: 15306984
DOI: 10.1021/nl300208c
Appears in Collections:Staff Publications

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