1. Observation of anisotropy in thermal conductivity of individual single-crystalline bismuth nanowires
- Author
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Arun Majumdar, Peter Ercius, Ming Zhi Li, Jin Hee Ham, Wooyoung Lee, Woochul Kim, Renkun Chen, Kedar Hippalgaonkar, and Jong Wook Roh
- Subjects
Materials science ,Condensed matter physics ,Scattering ,Phonon ,Macromolecular Substances ,Surface Properties ,General Engineering ,Nanowire ,Molecular Conformation ,General Physics and Astronomy ,chemistry.chemical_element ,Nanotechnology ,Thermal Conductivity ,Electron ,Bismuth ,Nanostructures ,Thermal conductivity ,chemistry ,Thermoelectric effect ,Materials Testing ,Anisotropy ,General Materials Science ,Particle Size - Abstract
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 [102] 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.
- Published
- 2011