Enhanced resonant Raman scattering and electron-phonon coupling from self-assembled secondary ZnO nanoparticles

Hsin Ming Cheng, Kuo Feng Lin, Hsu Cheng Hsu, Chih Jen Lin, Li Jiaun Lin, Wen Feng Hsieh

Research output: Contribution to journalArticlepeer-review

81 Citations (Scopus)

Abstract

Self-assembled secondary ZnO nanoparticles, recognized with the agglomeration of crystalline subcrystals, are successfully synthesized by a simple sol-gel method. TEM images display that one artificial cluster behaves in a single-crystal-like wurtzite structure because subcrystals coagulate as the same crystal orientation. Moreover, from the resonant Raman scattering, the as-grown sample exhibits phonon red shift; meanwhile, the coupling strength between electron and longitudinal optical phonon, determined by the ratio of second-to first-order Raman scattering cross sections, diminishes compared with the samples after postannealing at 350 and 500°C. The size dependence of electron-phonon coupling is principally as a result of the Fröhlich interaction.

Original languageEnglish
Pages (from-to)18385-18390
Number of pages6
JournalJournal of Physical Chemistry B
Volume109
Issue number39
DOIs
Publication statusPublished - 2005 Oct 6

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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