journal article·2011-05-24

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

Jong Wook Roh, Kedar Hippalgaonkar, Jin Hee Ham, Renkun Chen, Ming Zhi Li, Peter Ercius, Arun Majumdar, Woochul Kim, Wooyoung Lee

ACS Nano· Volume 5· Issue 5
Publisher page

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.
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Research context

OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal properties of materials · Thermal Radiation and Cooling Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering, Yonsei University, 262 Seongsanno, Seoul 120-749, Korea

Department of Mechanical Engineering, University of California, Berkeley, California 94720, United States

Department of Mechanical and Aerospace Engineering, University of California, San Diego 92093, United States

National Center for Electron Microscopy, Lawrence Berkeley Laboratories, Berkeley, California 94720, United States

School of Mechanical Engineering, Yonsei University, 262 Seongsanno, Seoul 120-749, Korea

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