Observation of Anisotropy in Thermal Conductivity of Individual Single-Crystalline Bismuth Nanowires
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- 作者：Jong Wook Roh ; Kedar Hippalgaonkar ; Jin Hee Ham ; Renkun Chen ; Ming Zhi Li ; Peter Ercius ; Arun Majumdar ; Woochul Kim ; Wooyoung Lee
- 刊名：ACS Nano
- 出版年：2011
- 出版时间：May 24, 2011
- 年：2011
- 卷：5
- 期：5
- 页码：3954-3960
- 全文大小：890K
- 年卷期：0
- ISSN：1936-086X
文摘
The thermal conductivity of individual single-crystalline Bi nanowires grown by the on-film formation of nanowires (ON–OFF) has been investigated. We observed that the thermal conductivity of single-crystalline Bi nanowires is highly anisotropic. Thermal conductivity of nanowires (diameter ∼100 nm) in the off-axis [1̅02] and [110] directions exhibits a difference of ∼7.0 W/m·K. The thermal conductivity in both growth directions is diameter-dependent, which indicates that thermal transport through the individual Bi nanowires is limited by boundary scattering of both electrons and phonons. This huge anisotropy in thermal conductivities of Bi nanowires suggests the importance of direction-dependent characterization of charge, thermal transport, and thermoelectric properties of Bi nanowires.