Far-Infrared Absorption by Acoustic Phonons in Titanium Dioxide Nanopowders
- 1 April 2006
- journal article
- Published by American Scientific Publishers in Journal of Nanoelectronics and Optoelectronics
- Vol. 1 (1) , 92-98
- https://doi.org/10.1166/jno.2006.010
Abstract
8 pages, 5 figuresWe 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 surfaceKeywords
All Related Versions
This publication has 0 references indexed in Scilit: