Open AccessThermal properties of electrodeposited bismuth telluride nanowires embedded in amorphous alumina
Author(s) -
D.-A. Borca-Tasciuc,
Gang Chen,
Amy L. Prieto,
Marisol MartínGonzález,
A. Stacy,
T. Sands,
M. A. Ryan,
JeanPierre Fleurial
Publication year - 2004
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.1834991
Subject(s) - bismuth telluride , nanowire , thermal diffusivity , materials science , thermal conductivity , bismuth , thermoelectric effect , thermoelectric materials , lead telluride , telluride , figure of merit , amorphous solid , composite material , nanocomposite , nanotechnology , optoelectronics , metallurgy , crystallography , doping , thermodynamics , chemistry , physics
3 pages, 3 figures.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 40 nm diameter Bi2Te3 nanowires/alumina nanocomposite. Measured thermal diffusivity of the composite decreases from 9.2×10–7 m2 s–1 at 150 K to 6.9×10–7 m2 s–1 at 300 K 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.G.C. would like to acknowledge financial support from\udJPL and DOE. M.S.M.G. acknowledges a fellowship\udawarded by the MCYT (Spain) in the Ramon y Cajal Program.Peer reviewe
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