Raman spectroscopy characterization of Ti O 2 rutile nanocrystals

2007; American Physical Society; Volume: 75; Issue: 4 Linguagem: Inglês

10.1103/physrevb.75.045416

ISSN

1550-235X

Autores

Tommaso Mazza, E. Barborini, P. Piseri, Paolo Milani, D. Cattaneo, Andrea Li Bassi, C. E. Bottani, Caterina Ducati,

Tópico(s)

TiO2 Photocatalysis and Solar Cells

Resumo

We report the characterization by Raman spectroscopy of rutile nanocrystals embedded in cluster-assembled $\mathrm{Ti}{\mathrm{O}}_{2}$ films produced by supersonic cluster beam deposition. Thermal annealing of the as-deposited films promotes the growth of rutile and anatase nanoparticles with a dimension distribution peaked around $10\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. We show that a phonon confinement model is not adequate to explain the features of the lattice dynamics of rutile nanocrystals. The coexistence of the two crystalline phases allows us to identify the role of chemical and structural inhomogeneities in the film potentially affecting the Raman spectra. Our results suggest that the lattice dynamics of rutile nanocrystals is influenced by the dielectric constant of the cluster-assembled films.

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