Chem. J. Chinese Universities ›› 2000, Vol. 21 ›› Issue (S1): 104.
• Analytical Sciences • Previous Articles Next Articles
JING Miao, LI Wei, ZHUANG Zhi-Xia, CHEN Xi, WANG Xiao-Ru
Online:
Published:
Supported by:
Supported by the National High-Tech. Project (863 project, 818-09-07).
Abstract:
Optical sensors can offer advantages over electrochemical sensors with respect to reduced interferences and ease of use for remote sensing[1]. The first fiber optic pH sensor was developed for in vivo measurements by Peterson et al[2]. This sensor relates pH to the absorbance of the base from of an immobilized dye. Subsequently, a pH sensor based on the fluorescence of immobilized fluoreseinamine was reported. The sensor involves immobilizing the amino fluoresecein (AF) complex within a porous sol-gel-processed film. Sol-gel process has many advantages as a method of immobilization[3]. At ambient temperature, it allows the fabrication of a tough, inert, porous glass material with a high surface area. Sol-gel technology provides a viable approach to prepare stable, optically transparent host matrices for the design of materials for sensor, optical, chromatographic[4], and catalytic applications. Alternatively, organosilicon precursors of the general formula can be hydrolyzed and co-condensed with tetraethoxysilane to form an organic-inorganic hybrid. An aliquot of the resultant sol can be spin cast or dip coated on a planar substrate to form a thin film.
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JING Miao, LI Wei, ZHUANG Zhi-Xia, CHEN Xi, WANG Xiao-Ru. Fibre-Optic pH Probe Based on the Use of An Immobilized Amino Fluoresecein Indicator[J]. Chem. J. Chinese Universities, 2000, 21(S1): 104.
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http://www.cjcu.jlu.edu.cn/EN/Y2000/V21/IS1/104