TiO2 nanoparticles (TiO2 NPs), synthetised by the hydrolysis at room temperature of titanyl oxalate, have been characterised by UV-vis spectroscopy and photoluminescence analysis. The influence of precursor concentration on Ti02 NPs growth and their optical properties have been studied. By the interpretation of absorbance spectra a rapid formation of titania clusters has been suggested and a constant energy onset at 3.59 eV has been found, according to a direct transition calculated for titanum dioxide. No size quantization effects can be addressed for stabilised colloids. Two photoluminescence (PL) peaks have been assigned to direct and indirect transitions, respectively. A third peak has been related to surface oxygen vacancies. Copyright © 2008 American Scientific Publishers All rights reserved.

Spectroscopic characterization of TiO2 nanoparticles

Picca R. A.;
2008

Abstract

TiO2 nanoparticles (TiO2 NPs), synthetised by the hydrolysis at room temperature of titanyl oxalate, have been characterised by UV-vis spectroscopy and photoluminescence analysis. The influence of precursor concentration on Ti02 NPs growth and their optical properties have been studied. By the interpretation of absorbance spectra a rapid formation of titania clusters has been suggested and a constant energy onset at 3.59 eV has been found, according to a direct transition calculated for titanum dioxide. No size quantization effects can be addressed for stabilised colloids. Two photoluminescence (PL) peaks have been assigned to direct and indirect transitions, respectively. A third peak has been related to surface oxygen vacancies. Copyright © 2008 American Scientific Publishers All rights reserved.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11586/232873
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