Measurements of thermal conductivity of La0.95Sr 0.05CoO3 nanofibers using MEMS devices

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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 La0.95Sr 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 La0.95Sr0.05CoO3 samples.

Original languageEnglish
Title of host publicationReliability, Packaging, Testing, and Characterization of MOEMS/MEMS, Nanodevices, and Nanomaterials XIII
DOIs
StatePublished - 2014
EventReliability, Packaging, Testing, and Characterization of MOEMS/MEMS, Nanodevices, and Nanomaterials XIII - San Francisco, CA, United States
Duration: 3 Feb 20144 Feb 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8975
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceReliability, Packaging, Testing, and Characterization of MOEMS/MEMS, Nanodevices, and Nanomaterials XIII
Country/TerritoryUnited States
CitySan Francisco, CA
Period3/02/144/02/14

Keywords

  • Heat Transfer
  • MEMS
  • Nanoscale
  • Thermal Conductivity
  • Thermoelectric

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