Journal
APPLIED SURFACE SCIENCE
Volume 162, Issue -, Pages 565-570Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0169-4332(00)00251-8
Keywords
nanostructures; semiconductors; optical properties
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We have examined the quantum size effect in anatase TiO2 nanoparticles. No shift of the band gap energy has been observed for sizes 2R greater than or equal to 1.5 nm. On the other hand, we have found unusual variation of the oscillator strength of the first allowed direct transition. The results indicate considerable structural size effect, which disables the effective mass approximation (EMA) in these nanocrystallites. (C) 2000 Elsevier Science B.V. All rights reserved.
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