Far infrared absorption by acoustic phonons in titanium dioxide nanopowders

Details Far infrared absorption by acoustic phonons in titanium dioxide nanopowders Far infrared absorption by acoustic phonons in titanium dioxide nanopowders

2006-02-03

arxiv.org/abs/cond-mat/0602066v1

Journal of Nanoelectronics and Optoelectronics, vol. 1, no. 1, pages 92-98, 2006

Physics

Condensed Matter

Materials Science

8 pages, 5 figures, submitted to Journal of Nanoelectronics and Optoelectronics

Scientific paper

10.1166/jno.2006.010

We report spectral features of far infrared electromagnetic radiation absorption in anatase TiO2 nanopowders which 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.

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