Structure and properties of Ti4+-ureasil organic-inorganic hybrids

Journal of the Brazilian Chemical Society

Celso Molina²  Karim Dahmouche²  Peter Hammer²  Verónica De Zea Bermudez¹  Luís D. Carlos¹  Maurizio Ferrari¹  Maurizio Montagna¹  Rogéria R. Gonçalves¹  Luiz. F. C. De Oliveira¹  Howell. G. M. Edwards¹  Younes Messaddeq²  Sidney J. L. Ribeiro² 

[1] ,Universidade Estadual Paulista Instituto de Química Araraquara SP ,Brazil

关键词: planar waveguides;    sol-gel;    hybrid materials;    ureasil;   

DOI  :  10.1590/S0103-50532006000300003

来源: SciELO

【 摘 要 】

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 Ti4+-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.

【 授权许可】

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