Phonon confinement and optical properties in nanosized titanium dioxide by Raman spectroscopy

Ming-Sheng Zhang; Weifeng Zhang; Zhen Yin

doi:10.1117/12.447377

31 October 2001 Phonon confinement and optical properties in nanosized titanium dioxide by Raman spectroscopy

Ming-Sheng Zhang, Weifeng Zhang, Zhen Yin

Proceedings Volume 4469, Raman Spectroscopy and Light Scattering Technologies in Materials Science; (2001) https://doi.org/10.1117/12.447377
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

Raman spectroscopy is used to study phonon confinement effect and photoluminescence (PL) for titanium dioxide nanocrystals. A chemical solution process was developed to prepare TiO₂ nanocrystals with particle sizes of 6.8 - 27.9 nm. As the grain size decreases, the lowest-frequency E_g mode at 152 cm^-1 shows blueshift and broadening. The frequency shift and line width broadening were theoretically studied at different grain sizes of 6.8, 10.3 and 27.9 nm under phonon confinement model, showing good agreement with experimental results. Non-stoichiometry effect was recorded by redshift of the 422 cm^-1 E_g mode, libration mode of the oxygen atoms along the c-axis. PL spectrum of the anatase TiO₂ nanocrystals was recorded at exciting power as low as 0.06 W/cm². A power-law relationship I_PL approximately equals P^(gamma ) was obtained between PL intensity and the excitation power. PL mechanism for TiO₂ nanocrystals is attributed to the recombination via the localized levels within the forbidden gap of defect-related centers, which reside in the surface region of TiO₂ nanocrystals.

Citation Download Citation

Ming-Sheng Zhang, Weifeng Zhang, and Zhen Yin "Phonon confinement and optical properties in nanosized titanium dioxide by Raman spectroscopy", Proc. SPIE 4469, Raman Spectroscopy and Light Scattering Technologies in Materials Science, (31 October 2001); https://doi.org/10.1117/12.447377

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KEYWORDS

Nanocrystals

Raman spectroscopy

Phonons

Crystals

Titanium dioxide

Annealing

Luminescence

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