Lattice Vibration Fundamentals of Anatase Nanocrystalline TiO_2 Thin Films Detected Using Unpolarized Infrared Spectroscopy
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Unpolarized infrared spectroscopic study was carried out on thin nanocrystalline anatase TiO<SUB>2</SUB> films with grain size of ≈20 nm. The transverse optical lattice vibration frequencies are the same as that of single-crystal anatase. The longitudinal optical modes can be detected with an oblique unpolariation at incident angles ≥50°. The broad LO absorption peak is a combination of the A<SUB>2u</SUB> LO and the E<SUB>u</SUB> LO modes' resonant response to the infrared radiation.
- Chemistry Letters
Chemistry Letters 35(8), 884-885, 2006-08-05
The Chemical Society of Japan