Influence of methacrylic-acrylic copolymer composition on plasticiser-free optode films for pH sensors

被引：24

作者：

Heng, LY ^{[1
]}

Fang, TH ^{[1
]}

Chern, LH ^{[1
]}

Ahmad, M ^{[1
]}

机构：

[1] Univ Kebangsaan Malaysia, Fac Sci & Technol, Sch Chem Sci & Food Technol, Bangi 43600, Selangor, Malaysia

来源：

SENSORS | 2003年 / 3卷 / 04期

关键词：

optical pH sensor; methacrylic-acrylic films; chromoionophore; plasticiser-free;

D O I：

10.3390/s30400083

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

In this work we have examined the use of plasticiser-free polymeric films incorporating a proton selective chromoionophore for optical pH sensor. Four types of methacrylic-acrylic copolymers containing different compositions of n-butyl acrylate (nBA) and methyl methacrylate (MMA) were synthesised for use as optical sensor films. The copolymers were mixed with appropriate amounts of chromoionophore (ETH5294) and a lipophilic salt before spin coated on glass slides to form films for the evaluation of pH response using spectrophotometry. Co-polymer films with high nBA content gave good response and the response time depended on the film thickness. A preliminary evaluation of the optical films of high nBA content with pHs from 2 - 14 showed distinguishable responses from pH 5 - 9. However, the adhesion of the pH sensitive film was good for copolymers with higher content of MMA but not for films with high nBA.

引用

页码：83 / 90

页数：8