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

Journal of the Brazilian Chemical Society

Universidade de Aveiro, Aveiro, Portugal¹  Universidade de São Paulo, Ribeirão Preto, Brazil¹  Ribeiro, Sidney J. L.¹  Hammer, Peter¹  Dahmouche, Karim¹  Oliveira, Luiz. F. C. de¹  University of Bradford, Bradford, UK¹  Instituto di Fotonica i Nanotecnologie, Povo, Italy¹  Molina, Celso¹  Bermudez, Verónica de Zea¹  Messaddeq, Younes¹  Università di Trento, Povo, Italy¹  Gonçalves, Rogéria R.¹  Universidade Federal de Juiz de Fora, Juiz de Fora, Brazil¹  Universidade de Trás-os-Montes e Alto Douro, Portugal¹  Carlos, Luís D.¹  Edwards, Howell. G. M.¹  Universidade Estadual Paulista, Araraquara, Brazil¹  Ferrari, Maurizio¹  Montagna, Maurizio¹ 

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

DOI  :  10.1590/S0103-50532006000300003

学科分类：化学（综合）

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】

Unknown