Suppressed Umklapp scattering of β-FeSi2 thin film and single crystalline nanowires

Cheng Lun Hsin, Yu Ting Liu, Yue Yun Tsai

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Thermal conductivity is an intriguing physical property in the nanometer or quantum regime. In this study, we report the growth and thermal conductivity of β-FeSi2 thin film and single crystalline nanowires. The sample structures and chemical composition were identified by standard microscopy techniques. The temperature-dependent thermal conductivity of the thin film was measured by the 3ω method, whereas that of the nanowires was conducted by a suspended pattern technique. Temperature-dependent thermal conductivity was found to increase gradually from 300 to 500 K due to the effect of surface scattering. The experimental evidence presented herein is the suppression of Umklapp transport at the nanoscale near room temperature and the potential application of nanoengineered β-FeSi2 for future design of thermoelectric materials.

Original languageEnglish
Article number485702
JournalNanotechnology
Volume28
Issue number48
DOIs
StatePublished - 6 Nov 2017

Keywords

  • nanowire
  • silicide
  • thermal conductivity
  • Umklapp scattering
  • β-FeSi

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