Thermoelectric oxide nanofibers prepared by electrospinning was expected to have a significantly reduced thermal conductivity compared with their bulk forms. However, the measurement of the thermal conductivity of such a single nanofiber was very difficult because of sample preparation, sample loading and the lack of characterization tools. In this work, a technology that can be used to measure the thermal conductivity of a single nanofiber prepared by electrospinning was developed. A special Si template was designed to collect and transfer the thermoelectric nanofibers prepared by electrospinning. A microelectro-mechanical (MEMS) device was designed and fabricated to measure the thermal conductivity of a single nanofiber. The structure of the MEMS device was specially designed therefore a single nanofiber collected by the special Si template can be transferred onto the MEMS device. A La0.95Sr0.05CoO3 nanofiber with the diameter of 290 nm was prepared and characterized by this technology. The measured thermal conductivity of the nanofiber was 2.07 W/m•K, which is 30% lower than that of the bulk form La0.95Sr0.05CoO3 previously reported.

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