Artículos de revistas
Structure and properties of Ti4+-Ureasil organic-inorganic hybrids
Fecha
2006-06-08Registro en:
Journal of the Brazilian Chemical Society, v. 17, n. 3, p. 443-452, 2006.
0103-5053
10.1590/S0103-50532006000300003
S0103-50532006000300003
WOS:000237738400003
2-s2.0-33744719713
2-s2.0-33744719713.pdf
6466841023506131
6446047463034654
0000-0003-3286-9440
0000-0002-3823-0050
Autor
Universidade Estadual Paulista (Unesp)
Universidade de Trás-os-Montes e Alto Douro
Universidade de Aveiro
CSMFO Group
Universidade de São Paulo (USP)
Universidade Federal de Juiz de Fora (UFJF)
University of Bradford
Institución
Resumen
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. ©2006 Sociedade Brasileira de Química.