Nano Archive

Far-infrared absorption by acoustic phonons in titanium dioxide nanopowders

Murray, Daniel B. and Netting, Caleb H. and Saviot, Lucien and Pighini, Catherine and Millot, Nadine and Aymes, Daniel and Liu, Hsiang-Lin (2006) Far-infrared absorption by acoustic phonons in titanium dioxide nanopowders. JOURNAL OF NANOELECTRONICS AND OPTOELECTRONICS, 1 (1). pp. 92-98.

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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.

Item Type:Article
Subjects:Material Science > Nanochemistry
Material Science > Nanostructured materials
ID Code:2680
Deposited By:Anuj Seth
Deposited On:06 Jan 2009 18:13
Last Modified:19 Jan 2009 17:01

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