Determination of optical parameters of colloidal TiO2 nanocrystals-based thin films by using surface plasmon resonance measurments (Articolo in rivista)

Type
Label
  • Determination of optical parameters of colloidal TiO2 nanocrystals-based thin films by using surface plasmon resonance measurments (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Alternative label
  • M.G. Manera , G. Leo, M.L. Curri , R. Comparelli , R. Rella (2005)
    Determination of optical parameters of colloidal TiO2 nanocrystals-based thin films by using surface plasmon resonance measurments
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • M.G. Manera , G. Leo, M.L. Curri , R. Comparelli , R. Rella (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto per la Microelettronica ed i Microsistemi (IMM) CNR, sez. Lecce, Via Arnesano, 73100 Lecce, Italy b ISUFI-Istituto Superiore di Formazione Interdisciplinare, Universit`a degli Studi di Lecce, Viale Gallipoli 49, 73100 Lecce, Italy c Istituto per lo Studio dei Materiali Nanostrutturati (ISMN) CNR, Area della Ricerca di Roma, Via Salaria Km 29.3, 00016 Monterotondo, Roma, Italy d Istituto per i Processi Chimico Fisici (IPCF) CNR, sez. Bari, Via Orabona 4, 70126 Bari, Italy e Dipartimento di Chimica, Universita’ di Bari, Via Orabona 4, 70126 Bari, Italy f Dipartimento di Ingegneria dell’Innovazione, Universit`a di Lecce, Via Arnesano, 73100 Lecce, Italy (literal)
Titolo
  • Determination of optical parameters of colloidal TiO2 nanocrystals-based thin films by using surface plasmon resonance measurments (literal)
Abstract
  • Surface plasmon resonance (SPR) study in angular modulation was used to optically characterize porous thin films based on TiO2 colloidal nanocrystals. Organic solutions of surfactant-capped TiO2 nanocrystals prepared by means of a colloidal chemistry route, were deposited as thin film by spin coating. Optical parameters of the obtained thin layers were calculated by using SPR measurements on both as deposited and annealed in dry-air thin layers. By using direct fitting of a set of the SPR resonant curves with Fresnel’s theory, the thickness and refractive index of the prepared thin films were determined. The application of the prepared layers as optical sensing materials was evaluated by detecting the variation of the optical parameters in the presence of different saturated alcohol vapours. Morphological and structural characterization of the thin layers was carried out and related to the optical behaviour of the sensing material. Adsorption of alcohol vapours onto the surface of the sensing layer was found to induce a variation of both thickness and refractive index of TiO2-based nanocrystals films. The presence of the organic passivating layer at the nanocrystal surface was demonstrated to play an effective role in the interaction between alcohol molecules and the sensing material. (literal)
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