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Pregled bibliografske jedinice broj: 319060

Nucleation and Crystallization of Titania Nanoparticles in Silica Titania Planar Waveguides: a Study by Low Frequency Raman Scattering


Montagna, M.; Chiasera, A.; Moser, E.; Visintainer, F.; Ferrari, M.; Zampedri, L.; Goncalves, R.R.; Ribeiro, S.J.L.; Martucci, A.; Guglielmi, M. et al.
Nucleation and Crystallization of Titania Nanoparticles in Silica Titania Planar Waveguides: a Study by Low Frequency Raman Scattering // Materials science forum, 455-456 (2004), 520-526 doi:10.4028/www.scientific.net/MSF.455-456.520 (međunarodna recenzija, članak, znanstveni)


Naslov
Nucleation and Crystallization of Titania Nanoparticles in Silica Titania Planar Waveguides: a Study by Low Frequency Raman Scattering

Autori
Montagna, M. ; Chiasera, A. ; Moser, E. ; Visintainer, F. ; Ferrari, M. ; Zampedri, L. ; Goncalves, R.R. ; Ribeiro, S.J.L. ; Martucci, A. ; Guglielmi, M. ; Ivanda, Mile ; Almeida, R.M.

Izvornik
Materials science forum (0255-5476) 455-456 (2004); 520-526

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Silica; Titania; Planar Waveguides; Low Frequency; Raman Scattering

Sažetak
SiO(2) (1-x) - TiO(2) (x) waveguides, with the mole fraction x in the range 0.07 - 0.20 and thickness of about 0.4 gm, were deposited on silica substrates by a dip-coating technique. The thermal treatments at 700-900degreesC, used to fully densify the xerogels, produce nucleation of TiO(2) nanocrystals even for the lowest TiO(2) content. The nucleation of TiO(2) nanocrystals and their growth by thermal annealing up to 1300degreesC were studied by waveguide Raman spectroscopy, for the SiO(2) (0.8) - TiO(2) (0.2) composition. By increasing the annealing temperature, the Raman spectrum evolves from that typical of the silica-titania glass to that of anatase, but brookite phase is dominant at intermediate temperatures. In the low frequency region (5-50 cm(-1)) of the Raman spectra, acoustic vibrations of the nanocrystals are observed. From the measured line shapes, we can deduce the size distribution of the particles. The results are compared with those obtained from the line widths in the X-ray diffraction patterns. Nanocrystals with a mean size in the range 4-20 nm are obtained, by thermal annealing in a corresponding range of 800-1300degreesC

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
0098022

Ustanove
Institut "Ruđer Bošković", Zagreb

Autor s matičnim brojem:
Mile Ivanda, (135746)

Časopis indeksira:


  • Web of Science Core Collection (WoSCC)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


Uključenost u ostale bibliografske baze podataka:


  • Chemical Abstracts, SCOPUS, Web of Science


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