Particle-level engineering of thermal conductivity in matrix-embedded semiconductor nanocrystals

Daniel C. Hannah, Sandrine Ithurria, Galyna Krylova, Dmitri V. Talapin, George C. Schatz, Richard D. Schaller

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Known manipulations of semiconductor thermal transport properties rely upon higher-order material organization. Here, using time-resolved optical signatures of phonon transport, we demonstrate a "bottom-up" means of controlling thermal outflow in matrix-embedded semiconductor nanocrystals. Growth of an electronically noninteracting ZnS shell on a CdSe core modifies thermalization times by an amount proportional to the overall particle radius. Using this approach, we obtain changes in effective thermal conductivity of up to 5× for a nearly constant energy gap.

Original languageEnglish
Pages (from-to)5797-5801
Number of pages5
JournalNano letters
Volume12
Issue number11
DOIs
Publication statusPublished - Nov 14 2012

Keywords

  • Quantum dot
  • phonon
  • semiconductor
  • spectroscopy
  • thermal transport

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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