Raman spectroscopy characterization of TiO2 rutile nanocrystals

T. Mazza, E. Barborini, P. Piseri, P. Milani, D. Cattaneo, A. Li Bassi, C. E. Bottani, and C. Ducati
Phys. Rev. B 75, 045416 – Published 11 January 2007

Abstract

We report the characterization by Raman spectroscopy of rutile nanocrystals embedded in cluster-assembled TiO2 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 10nm. 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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  • Received 7 August 2006

DOI:https://doi.org/10.1103/PhysRevB.75.045416

©2007 American Physical Society

Authors & Affiliations

T. Mazza, E. Barborini*, P. Piseri, and P. Milani

  • CIMAINA, and Dipartimento di Fisica, Universita’ di Milano, via Celoria 16, I-20133 Milano, Italy

D. Cattaneo, A. Li Bassi, and C. E. Bottani

  • NEMAS, CNISM and Dipartimento di Ingegneria Nucleare, Politecnico di Milano, Via Ponzio 34/3 I-20133 Milano, Italy

C. Ducati

  • Department of Material Science and Metallurgy, University of Cambridge, Cambridge, CB2 3QZ, United Kingdom

  • *Present address: Tethis srl, via Russoli 3, 20151 Milano, Italy.
  • Corresponding author. Electronic address: pmilani@mi.infn.it

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Issue

Vol. 75, Iss. 4 — 15 January 2007

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