Influence of the surface polarity of dye-doped sol-gel glass films on optical ammonia sensor response

被引：48

作者：

Malins, C ^{[1
]}

Butler, TM ^{[1
]}

MacCraith, BD ^{[1
]}

机构：

[1] Dublin City Univ, Sch Phys Sci, Opt Sensors Grp, Dublin 9, Ireland

来源：

THIN SOLID FILMS | 2000年 / 368卷 / 01期

关键词：

ammonia; optical spectroscopy; sensors; sol-gel glass;

D O I：

10.1016/S0040-6090(00)00913-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A sulfonephthalein dye was immobilized in sol-gel-derived thin films fabricated from mixtures of tetraethoxysilane and methyltriethoxysilane. Evanescent wave absorption spectra on optical fibres were monitored on exposure to gaseous ammonia. Analysis reveals nonclassical response behaviour, the extent of which is related to the polarity of the glass. This is accounted for in terms of dye solvation and the involvement of the micro-heterogeneous glass surface in the indicator reaction. These observations place important restrictions of the suitability of polar dye/sol-gel-derived glass combinations for gas phase analysis. (C) 2000 Elsevier Science S.A. All rights reserved.

引用

页码：105 / 110

页数：6

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