Thermal properties characterization of Bi nanowires is critical in order to validate the predicted enhancement of their thermoelectric figure-of-merit. In this paper we report the effective thermal diffusivity of Bi nanowires array embedded in a-Al2O3 (alumina) template. The composite material consists of 85% alumina and approximately 15% Bi nanowires with a diameter of 40 nm and an average length of 40 [.proportional]m. Measurements are performed along the nanowire axis. A thermal wave is produced at the front side of the sample and it is monitored at the backside through a fast thermoelectric effect. A one-dimensional heat conduction model is used to extract the thermal diffusivity.
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Borca-Tasciuc, DA., Chen, G., Lin, YM. et al. Thermal Characterization of Nanowire Array in a-Al2O3 Matrix. MRS Online Proceedings Library 703, 27 (2001). https://doi.org/10.1557/PROC-703-V2.7