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Optical band-gap of TiO2 nanopowders doped with Al2O3

Published online by Cambridge University Press:  15 January 2013

Keisuke Yoshimura ,
Tetsuya Hashimoto  and
Hiroshi Katsumata
Keisuke Yoshimura
Affiliation:
School of Science and Technology, Meiji University, Kawasaki 214-8571, Japan
Tetsuya Hashimoto
Affiliation:
School of Science and Technology, Meiji University, Kawasaki 214-8571, Japan
Hiroshi Katsumata
Affiliation:
School of Science and Technology, Meiji University, Kawasaki 214-8571, Japan
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Abstract

Optical band-gap and cathode luminescence (CL) properties of anatase TiO2 nanopowders mixed with γ- Al2O3 powders by planetary ball mill were evaluated as a function of a powder mass ratio (x=Al2O3/TiO2) of 0 to 0.5 and their correlation with XRD spectra was also investigated. The optical band-gap of TiO2 increased from 3.36 eV to 3.41eV with increasing milling time (tm) up to 600 min, which was in good agreement with the blue shifts observed in the CL spectra with increasing tm and it was interpreted as a quantum size effect. In addition, the optical band-gap of TiO2 powders mixed with Al2O3 with tm=60min greatly increased from 3.36 eV to 3.48 eV with increasing x up to x=0.5. On the other hand, the optical band-gap of all the powders was decreased by annealing at temperatures above 600°C, which was evidenced by the XRD spectra to be due to the growth of grain size.

Keywords

semiconductingphotovoltaicparticulate
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1493: Symposium E/H – Photovoltaic Technologies, Devices and Systems Based on Inorganic Materials, Small Organic Molecules and Hybrids , 2013 , pp. 281 - 286
Copyright
Copyright © Materials Research Society 2013 

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References

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