Pressure-induced changes on the optical properties and microstructure of silica-gel matrices doped with rhodamine 6G

被引:19
作者
Costa, TMH
Hoffmann, HS
Benvenutti, EV
Stefani, V
Gallas, MR
机构
[1] Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
[2] Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil
关键词
high-pressure; fluorescent dyes; silica matrix; sol-gel;
D O I
10.1016/j.optmat.2004.11.006
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Sol-get method and high-pressure technique were associated to produce silica compacts with low porosity and doped with rhodamine 6G (R6G). Acid catalyzed solutions of tetraethyl orthosilicate mixed with dye previously dissolved in ethanol were used for the synthesis of doped silica gel. The monolith obtained was comminuted and the powder was compacted between 3.0 and 7.7 GPa, at room temperature, using a toroidal-type high-pressure chamber. Excitation-emission fluorescence spectroscopy was used to investigate the optical properties of R6G embedded in the closed pores of the silica matrix. Measurements of surface areas and pore size distribution for the powders and compacts, using the N-2 isotherms were performed, showing a great reduction in surface area and porosity, after compaction. The dye entrapped in the compacted silica maintains its optical properties similar to that in ethanolic solutions, meaning that the dye is dispersed in a molecular level. Additionally, these samples are optically transparent, hard and resistant to dye leaching and to chemical attacks, being a promising material to be used in optical devices. (c) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:1819 / 1824
页数:6
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