Engineering the nanocrystalline structure of TiO2 films by aerodynamically filtered cluster deposition
E. BarboriniINFM-Dipartimento di Fisica, Universita’ di Milano, Via Celoria 16, I-20133 Milano, ItalyIskandar KholmanovINFM-Dipartimento di Fisica, Universita’ di Milano, Via Celoria 16, I-20133 Milano, ItalyP. PiseriINFM-Dipartimento di Fisica, Universita’ di Milano, Via Celoria 16, I-20133 Milano, ItalyCaterina DucatiDepartment of Engineering, University of Cambridge, Cambridge, United KingdomC. E. BottaniINFM-Dipartimento di Ingegneria Nucleare, Politecnico di Milano, I-20133 Milano, ItalyP. MilaniINFM-Dipartimento di Fisica, Universita’ di Milano, Via Celoria 16, I-20133 Milano, Italy
2002en
ABI
Аннотация
We have produced nanocrystalline titanium dioxide films with different structures (anatase or rutile) by depositing mass selected clusters from the gas phase. Nanoparticles are produced by a pulsed microplasma cluster source and are selected by aerodynamic separation effects. We have characterized nanocrystalline films by Raman spectromicroscopy and transmission electron microscopy, showing that the films assembled with very small clusters have a predominant rutile phase, whereas larger clusters form films with anatase structure. Our observations suggest that phonon confinement effects are responsible for a significant shift and broadening observed for the Raman peaks.
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