Phonon confinement effects in the Raman scattering byTiO2nanocrystals
作者:
D. Bersani,
P. P. Lottici,
Xing-Zhao Ding,
期刊:
Applied Physics Letters
(AIP Available online 1998)
卷期:
Volume 72,
issue 1
页码: 73-75
ISSN:0003-6951
年代: 1998
DOI:10.1063/1.120648
出版商: AIP
数据来源: AIP
摘要:
NanocrystallineTiO2has been obtained by a sol-gel process by controlling the crystal size through the water/alkoxide ratio. Raman spectra of anatase nanocrystals with average sizes of 9.5–13.4 nm are reported and the correlation between the Raman band shape (peak position and linewidth) of the main feature at 144cm−1and the crystals dimension is discussed. While in this system a minor role is played by nonstoichiometry and pressure effects, a model based on the phonon confinement, which takes into account the size distribution as determined by the transmission electron microscopy images, correctly reproduces the Raman band shape change. ©1998 American Institute of Physics.
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