Abstract

Excitation of lattice vibrations in nanostructured anatase TiO2 frequently occurs at energy values differingfrom that found for the corresponding bulk phase. Particularly, investigations have long aimed at establishinga correlation between the low-frequency Eg(1) mode and the mean crystallite size on the basis of phononconfinementmodels. Here, we report a detailed Raman study, supported by X-ray diffraction analyses, onanatase TiO2 nanocrystals with rod-shaped morphology and variable geometric parameters, prepared by colloidalwet-chemical routes. By examining the anomalous shifts of the Eg(1) mode in the spectra of surfactantcappednanorods and in those of corresponding organic-free derivatives (obtained by a suitable thermal oxidativetreatment), an insight into the impact of exposed facets and of the coherent crystalline domain size onRaman-active lattice vibrational modes has been gained. Our investigation offers a ground for clarifying thecurrent lack of consensus as to the applicability of phonon-confinement models for drawing information on thesize of surface-functionalized TiO2 nanocrystals upon analysis of their Raman features.

Autore Pugliese

• Giannini Cinzia , Altamura Davide

Tutti gli autori

• B.F. Scremin; M.R. Belviso; D. Altamura; C. Giannini; P. D. Cozzoli

Titolo volume/Rivista

Science of advanced materials

Anno di pubblicazione

2014

ISSN

1947-2943

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

Non Disponibile

Ultimo Aggiornamento Citazioni

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Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile