Comparative Raman Study of Organic-Free and Surfactant-Capped Rod-Shaped Anatase TiO2 Nanocrystals (Articolo in rivista)

Type
Label
  • Comparative Raman Study of Organic-Free and Surfactant-Capped Rod-Shaped Anatase TiO2 Nanocrystals (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1166/sam.2014.1856 (literal)
Alternative label
  • Barbara Federica Scremin, Maria R. Belviso, Davide Altamura, Cinzia Giannini, P. Davide Cozzoli (2014)
    Comparative Raman Study of Organic-Free and Surfactant-Capped Rod-Shaped Anatase TiO2 Nanocrystals
    in Science of advanced materials (Online); American Scientific Publishers, Los Angeles (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Barbara Federica Scremin, Maria R. Belviso, Davide Altamura, Cinzia Giannini, P. Davide Cozzoli (literal)
Pagina inizio
  • 923 (literal)
Pagina fine
  • 932 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.aspbs.com/ (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 6 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 10 (literal)
Note
  • Scopus (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • National Nanotechnology Laboratory (NNL)-CNR Istituto Nanoscienze, c/o Distretto Tecnologico, via per Arnesano km 5, I-73100 Lecce, Italy Istituto di Cristallografia (IC)-CNR, via Amendola 122/O, I-70126 Bari, Italy Dipartimento di Matematica e Fisica \"E. De Giorgi,\" Università del Salento, via per Arnesano, I-73100 Lecce, Ita (literal)
Titolo
  • Comparative Raman Study of Organic-Free and Surfactant-Capped Rod-Shaped Anatase TiO2 Nanocrystals (literal)
Abstract
  • Excitation of lattice vibrations in nanostructured anatase TiO2 frequently occurs at energy values differing from that found for the corresponding bulk phase. Particularly, investigations have long aimed at establishing a correlation between the low-frequency Eg(1) mode and the mean crystallite size on the basis of phononconfinement models. Here, we report a detailed Raman study, supported by X-ray diffraction analyses, on anatase TiO2 nanocrystals with rod-shaped morphology and variable geometric parameters, prepared by colloidal wet-chemical routes. By examining the anomalous shifts of the Eg(1) mode in the spectra of surfactantcapped nanorods and in those of corresponding organic-free derivatives (obtained by a suitable thermal oxidative treatment), an insight into the impact of exposed facets and of the coherent crystalline domain size on Raman-active lattice vibrational modes has been gained. Our investigation offers a ground for clarifying the current lack of consensus as to the applicability of phonon-confinement models for drawing information on the size of surface-functionalized TiO2 nanocrystals upon analysis of their Raman features. (literal)
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