Journal
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
Volume 23, Issue -, Pages 136-143Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mssp.2014.02.041
Keywords
Sol-gel; Co-precipitation; TiO2; Photoconductivity; Nanomaterials
Categories
Funding
- Basic Science Research Program [NRF 2011-0022485]
- Korea-India Exchange Student Program (Global Korea Scholarship) - Ministry of Education-Singapore
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The effect of synthesis method on optical and photoconducting properties of titanium dioxide (TiO2) nanoparticles has been investigated. Sol-gel and co-precipitation methods have been employed to prepare pure anatase phased TiO2 nanoparticles calcinated at different temperatures below 500 degrees C. The optimized value of average crystallite size is within the range of 19-21 nm for a common calcination temperature of 400 degrees C for both the methods. The redshift in optical band gap of 0.9 eV has been observed for the sample synthesized by co-precipitation method with respect to the sol-gel method. The photoluminescence spectrum exhibits broad visible emission in both routes of synthesis while photoconductivity shows fast growth and decay of photocurrent in TiO2 prepared by co-precipitation method as compared to TiO2 prepared by the sol-gel method under visible illumination. Crystal structure based Rietveld refinement of X-ray diffraction data, scanning electron microscopy as well as photoluminescence and photoconductivity measurements were performed to characterize nanocrystalline anatase TiO2. (C) 2014 Elsevier Ltd. All rights reserved.
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