Quantum size effect in TiO2 nanoparticles: does it exist?

Authors
Monticone, S Tufeu, R Kanaev, AV Scolan, E Sanchez, C
Citation
S. Monticone et al., Quantum size effect in TiO2 nanoparticles: does it exist?, APPL SURF S, 162, 2000, pp. 565-570
Citations number
26
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
APPLIED SURFACE SCIENCE
ISSN journal
01694332 → ACNP
Volume
162
Year of publication
2000
Pages
565 - 570
Database
ISI
SICI code
0169-4332(200008)162:<565:QSEITN>2.0.ZU;2-Q
Abstract
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 in dicate considerable structural size effect, which disables the effective ma ss approximation (EMA) in these nanocrystallites. (C) 2000 Elsevier Science B.V. All rights reserved.