Measurements of thermal conductivity of La0.95Sr0.05CoO3 nanofibers using MEMS devices

Weihe Xu; Hamid Hadim; Yong S. Chu; Yong Shi; Evgeny Nazaretski

doi:10.1117/12.2054464

7 March 2014 Measurements of thermal conductivity of La_0.95Sr_0.05CoO₃ nanofibers using MEMS devices

Weihe Xu, Hamid Hadim, Yong S. Chu, Yong Shi, Evgeny Nazaretski

Author Affiliations +

Proceedings Volume 8975, Reliability, Packaging, Testing, and Characterization of MOEMS/MEMS, Nanodevices, and Nanomaterials XIII; 89750D (2014) https://doi.org/10.1117/12.2054464
Event: SPIE MOEMS-MEMS, 2014, San Francisco, California, United States

Abstract

Thermoelectric oxide nanofibers prepared by electrospinning are expected to have reduced thermal conductivity when compared to bulk samples. Measurements of nanofibers’ thermal conductivity is challenging since it involves sophisticated sample preparation methods. In this work, we present a novel method suitable for measurements of thermal conductivity in a single nanofiber. A microelectro-mechanical (MEMS) device has been designed and fabricated to perform thermal conductivity measurements on a single nanofiber. A special Si template was designed to collect and transfer individual nanofibers onto a MEMS device. Pt was deposited by Focused Ion Beam to reduce the effective length of a prepared nanofiber. A single La_0.95Sr_0.05CoO₃ nanofiber with a diameter of 140 nm was studied and characterized using this approach. Measured thermal conductivity of a nanofiber was determined to be 0.7 W/m•K, which is 23% of the value reported for bulk La_0.95Sr_0.05CoO₃ samples.

Citation Download Citation

Weihe Xu, Hamid Hadim, Yong S. Chu, Yong Shi, and Evgeny Nazaretski "Measurements of thermal conductivity of La_0.95Sr_0.05CoO₃ nanofibers using MEMS devices", Proc. SPIE 8975, Reliability, Packaging, Testing, and Characterization of MOEMS/MEMS, Nanodevices, and Nanomaterials XIII, 89750D (7 March 2014); https://doi.org/10.1117/12.2054464

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KEYWORDS

Nanofibers

Microelectromechanical systems

Thermoelectric materials

Silicon

Oxides

Silica

Platinum

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