Characterization of the thermal conductivity of La0.95Sr0.05CoO3 thermoelectric oxide nanofibers

Weihe Xu, Evgeny Nazaretski, Ming Lu, Hamid Hadim, Yong Shi

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

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 of 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 a focused ion beam to reduce the effective length of a prepared nanofiber. La0.95Sr0.05CoO3 nanofibers with diameters of 140 nm and 290 nm were studied and characterized using this approach at room temperature. Measured thermal conductivities yielded values of 0.7 W·m−1·K−1 and 2.1 W·m−1·K−1, respectively. Our measurements in La0.95Sr0.05CoO3 nanofibers confirmed that a decrease of linear dimensions has a profound effect on its thermal conductivity.[Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)1224-1231
Number of pages8
JournalNano Research
Volume7
Issue number8
DOIs
StatePublished - 1 Aug 2014

Keywords

  • MEMS
  • heat transfer
  • nanoscale
  • thermal conductivity
  • thermoelectric

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