Far-infrared absorption by acoustic phonons in titanium dioxide nanopowders

Daniel B. Murray*, Caleb H. Netting, Lucien Saviot, Catherine Pighini, Nadine Millot, Daniel Aymes, Hsiang Lin Liu

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

28 引文 斯高帕斯(Scopus)

摘要

We report spectral features of far-infrared electromagnetic radiation absorption in anatase TiO2 nanopowders that we attribute to absorption by acoustic phonon modes of nanoparticles. The frequency of peak excess absorption above the background level corresponds to the predicted frequency of the dipolar acoustic phonon from continuum elastic theory. The intensity of the absorption cannot be accounted for in a continuum elastic dielectric description of the nanoparticle material. Quantum mechanical scale-dependent effects must be considered. The absorption cross section is estimated from a simple mechanical phenomenological model. The results are in plausible agreement with the absorption being due to a sparse layer of charge on the nanoparticle surface.

原文英語
頁(從 - 到)92-98
頁數7
期刊Journal of Nanoelectronics and Optoelectronics
1
發行號1
DOIs
出版狀態已發佈 - 2006

ASJC Scopus subject areas

  • 電子、光磁材料
  • 電氣與電子工程

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