Measurement of thermal conductivities of BI2TE3and SB2TE3nanopowders at extreme temperature and strain

Chenxin Xu, Brandon Wang, Emily Sneddon, Gianna Marcovecchio, Greg Ota, Karina Hunstein, Xian Zhang

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

Abstract

The Raman optothermal technique has been the most successful method for measurement of thermal conductivity of two dimensional (2D) materials, and was used to measure the thin films for the first time in this work. In this technique, a laser is focused at the center of a thin film and used to measure the peak position of a Raman-active mode. As the laser power is increased, the sample is heated which enables red-shift Raman mode due to thermal softening. Another comparison experiment is conducted by placing the samples on a heating platform and monitor the change of Raman-active mode peak position shift. Combining these two sections of experiments provide us the thermal modeling can then be used to extract the thermal conductivity from the measured shift rate. We have used a refined version of the optothermal Raman technique to study thermal conductivity of thin films of Bi2Te3 and Sb2Te3, at extreme temperatures and mechanical strains. It is the first thermal measurement on these two materials by Raman optothermal technique. This work also addresses several important issues in the measurement of thermal conductivity of thin films using Raman spectroscopy.

Original languageEnglish
Title of host publicationHeat Transfer and Thermal Engineering
ISBN (Electronic)9780791884591
DOIs
StatePublished - 2020
EventASME 2020 International Mechanical Engineering Congress and Exposition, IMECE 2020 - Virtual, Online
Duration: 16 Nov 202019 Nov 2020

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
Volume11

Conference

ConferenceASME 2020 International Mechanical Engineering Congress and Exposition, IMECE 2020
CityVirtual, Online
Period16/11/2019/11/20

Keywords

  • BiTe
  • Extreme conditions
  • Raman optothermal technique
  • SbTe
  • thermal conductivity

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