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RESEARCH PRODUCT
Far infrared absorption by acoustic phonons in titanium dioxide nanopowders
Hsiang Lin LiuSaviot LucienDaniel B. MurrayCaleb H. NettingD. AymesNadine MillotCatherine Pighinisubject
Materials sciencePhononContinuum (design consultancy)FOS: Physical sciences02 engineering and technologyDielectric01 natural sciences7. Clean energyMolecular physicsElectromagnetic radiationCondensed Matter::Materials ScienceFar infrared0103 physical sciencesPhenomenological modelElectrical and Electronic Engineeringacoustic phonon010306 general physicsAbsorption (electromagnetic radiation)Condensed Matter - Materials Sciencetitanium dioxidenanoparticleAbsorption cross sectionMaterials Science (cond-mat.mtrl-sci)[ PHYS.COND.CM-GEN ] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]021001 nanoscience & nanotechnology3. Good healthElectronic Optical and Magnetic Materialsinfrared absorption0210 nano-technologydescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-02-03 |