Thermal Characterization of Nanowire Array in alpha-Al2O3 Matrix
MASSACHUSETTS INST OF TECH CAMBRIDGE
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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 alpha-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 micrometers. 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.
- Inorganic Chemistry