Structure and Properties of Ti4+-Ureasil Organic-Inorganic Hybrids (Articolo in rivista)

Type
Label
  • Structure and Properties of Ti4+-Ureasil Organic-Inorganic Hybrids (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • C. Molina, K. Dahmouche, P. Hammer, V. de Zea Bermudez, L. D. Carlos, M. Ferrari, M. Montagna, R. R. Gonçalves, L. F. C. de Oliveira, H. G. M. Edwards, Y. Messaddeq, and S. J. L. Ribeiro (2006)
    Structure and Properties of Ti4+-Ureasil Organic-Inorganic Hybrids
    in Journal of the Brazilian Chemical Society (Impr.)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • C. Molina, K. Dahmouche, P. Hammer, V. de Zea Bermudez, L. D. Carlos, M. Ferrari, M. Montagna, R. R. Gonçalves, L. F. C. de Oliveira, H. G. M. Edwards, Y. Messaddeq, and S. J. L. Ribeiro (literal)
Pagina inizio
  • 443 (literal)
Pagina fine
  • 452 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 17 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Titolo
  • Structure and Properties of Ti4+-Ureasil Organic-Inorganic Hybrids (literal)
Abstract
  • Hybrid planar waveguides were prepared from Ti4+-acetylacetone (acac)-Ureasil sols deposited on glass substrates. Structural features have been investigated by spectroscopic measurements (Fourier Transform Infrared Spectroscopy (FTIR), X-ray Photoelectron Spectroscopy (XPS) and Raman scattering) and Small Angle X-ray Scattering (SAXS). Addition of Ti 4+-acac to the ureasil (Ti:Si molar ratio 1:1) leads to the formation of bonds between the Ti complex and the siloxane groups, whereas further addition of Ti4+ (Ti:Si molar ratio 5:1) leads to the additional formation of titanium-rich nanoclusters. The optical parameters of the waveguides such as refractive index, thickness, propagating modes and attenuation coefficient were measured at 632.8, 543.5 and 1550 nm by the prism coupling technique. The refractive index can be tuned by the Ti4+ relative content. The few microns thick planar waveguides support well confined propagating modes with low attenuation loss for all compositions. (literal)
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