TY - JOUR
T1 - Structure and properties of Ti4+-Ureasil organic-inorganic hybrids
AU - Molina, Celso
AU - Dahmouche, Karim
AU - Hammer, Peter
AU - Bermudez, Verónica De Zea
AU - Carlos, Luís D.
AU - Ferrari, Maurizio
AU - Montagna, Maurizio
AU - Gonçalves, Rogéria R.
AU - De Oliveira, Luiz F.C.
AU - Edwards, Howell G.M.
AU - Messaddeqa, Younes
AU - Ribeiro, Sidney J.L.
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
KW - Hybrid materials
KW - Planar waveguides
KW - Sol-gel
KW - Ureasil
UR - http://www.scopus.com/inward/record.url?scp=33744719713&partnerID=8YFLogxK
U2 - 10.1590/S0103-50532006000300003
DO - 10.1590/S0103-50532006000300003
M3 - Article
AN - SCOPUS:33744719713
SN - 0103-5053
VL - 17
SP - 443
EP - 452
JO - Journal of the Brazilian Chemical Society
JF - Journal of the Brazilian Chemical Society
IS - 3
ER -