Thermal properties of electrodeposited bismuth telluride nanowires embedded in amorphous alumina
D.-A. Borca-TasciucDepartment of Mechanical and Aerospace Engineering , University of California, Los Angeles, California 90095Gang ChenDepartment of Mechanical Engineering , Massachusetts Institute of Technology, Cambridge, Massachusetts 02139Amy L. PrietoDepartment of Chemistry , University of California, Berkeley, California 94720Marisol Martín‐GonzálezDepartment of Chemistry , University of California, Berkeley, California 94720A. StacyDepartment of Chemistry , University of California, Berkeley, California 94720T. SandsSchool of Materials Engineering , School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907M. A. RyanJet Propulsion Laboratory , California Institute of Technology, Pasadena, California 91109Jean‐Pierre FleurialJet Propulsion Laboratory , California Institute of Technology, Pasadena, California 91109
2004en
ABI
Abstract
Bismuth telluride nanowires are of interest for thermoelectric applications because of the predicted enhancement in the thermoelectric figure-of-merit in nanowire structures. In this letter, we carried out temperature-dependent thermal diffusivity characterization of a 40nm diameter Bi2Te3 nanowires∕alumina nanocomposite. Measured thermal diffusivity of the composite decreases from 9.2×10−7m2s−1 at 150Kto6.9×10−7m2s−1 at 300K and is lower than thermal diffusivity of unfilled alumina templates. Effective medium calculations indicate that the thermal conductivity along nanowires axis is at least an order of magnitude lower than thermal conductivity of the bulk bismuth telluride.
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