LED-COMPATIBLE FLUOROSENSOR FOR MEASUREMENT OF NEAR-NEURAL PH VALUES

被引:70
作者
WOLFBEIS, OS
RODRIGUEZ, NV
WERNER, T
机构
[1] Institute of Organic Chemistry, Analytical Division, Karl-Franzens University, Graz
关键词
OPTICAL SENSOR; SENSOR MATERIAL; PH MEASUREMENT; FLUORESCENCE; SOL-GEL; OPTRODE FOR PH;
D O I
10.1007/BF01242422
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
We report on an optical sensor material suitable for fluorimetric measurement of pH in the 6 9 range using a new, fully LED-compatible fluorescent dye. Its base form has a strong absorption between 580 and 630 nm that matches the emission band of conventional yellow or orange light-emitting diodes. Two kinds of dye immobilization are reported. The first is based on covalent binding to a cellulosic matrix and the resulting material is intended for use in sensing membranes. The second involves physical entrapment of the dye in a sol-gel matrix which can be used for optical fiber tip coating as well as in evanescent wave type sensors. Both kinds of sensor materials are studied with respect to dynamic pH ranges, response times, sensitivity toward ion strength, and stability.
引用
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页码:133 / 141
页数:9
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