Temperature-dependent thermal conductivities of 1D semiconducting nanowires via four-point-probe 3-ω method

Seung Yong Lee, Mi Ri Lee, No Won Park, Gil Sung Kim, Heon Jin Choi, Tae Youl Choi, Sang Kwon Lee

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

We report on a systematic study of the thermal transport characteristics of both as-grown zinc oxide and gallium nitride nanowires (NWs) via the four-point-probe 3-ω method in the temperature range 130-300 K. Both as-grown NWs were synthesized by a vapor-liquid-solid growth mechanism, and show clear n-type semiconducting behavior without any defects, which enables both the NWs to be promising candidates for thermoelectric materials. To measure the thermal conductivities of both NWs with lower heat loss and measurement errors, the suspended structures were formed by a combination of an e-beam lithography process and a random dispersion method. The measured thermal conductivities of both NWs are greatly reduced compared to their bulk materials due to the enhanced phonon scattering via the size effect and dopants (impurities). Furthermore, we observed that the Umklapp peaks of both NWs are shifted to a higher temperature than those of their bulk counterparts, indicating that phonon-boundary scattering dominates over other phonon scattering due to the size effect.

Original languageEnglish
Article number495202
JournalNanotechnology
Volume24
Issue number49
DOIs
Publication statusPublished - 2013 Dec 13

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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