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Observation of Anisotropy in Thermal Conductivity of Individual Single-Crystalline Bismuth Nanowires

TitleObservation of Anisotropy in Thermal Conductivity of Individual Single-Crystalline Bismuth Nanowires
Publication TypeJournal Article
Year of Publication2011
AuthorsRoh, Jong Wook, Kedar Hippalgaonkar, Jin Hee Ham, Renkun Chen, Ming Zhi Li, Peter Ercius, Arun Majumdar, Woochul Kim, and Wooyoung Lee
JournalACS Nano
Volume5
Issue5
Pagination3954-3960
Date PublishedMay 2011
ISBN Number1936-0851
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 [1?02] 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.

URLhttp://dx.doi.org/10.1021/nn200474d
Short TitleACS Nano