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Sensors 2003, 3(4), 83-90; doi:10.3390/s30400083
Article

Influence of Methacrylic-Acrylic Copolymer Composition on Plasticiser-free Optode Films for pH Sensors

*, ,  and
School of Chemical Sciences & Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
* Author to whom correspondence should be addressed.
Received: 7 March 2003 / Accepted: 24 March 2003 / Published: 27 March 2003
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Abstract

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.
Keywords: Optical pH sensor; Methacrylic-acrylic films; Chromoionophore; Plasticiserfree Optical pH sensor; Methacrylic-acrylic films; Chromoionophore; Plasticiserfree
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Heng, L.Y.; Fang, T.H.; Chern, L.H.; Ahmad, M. Influence of Methacrylic-Acrylic Copolymer Composition on Plasticiser-free Optode Films for pH Sensors. Sensors 2003, 3, 83-90.

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