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Issue 126, 2015
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A novel sensor based on electropolymerized substituted-phenols for pH detection in unbuffered systems

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Abstract

This work summarizes the electrochemical response of a range of substituted phenols, including salicylaldehyde and salicylic acid, for use as a voltammetric pH sensor for the determination of pH in both buffered and unbuffered media. Suitable candidates are identified and mechanistic insights into oxidation mechanism of the electro-polymerization by comparing with other substituted phenols are given. Square wave voltammetry measurements suggest the peak achieved through the electrochemical polymerization directly after the 1-electron 1-proton oxidation for both salicylaldehyde and salicylic acid shows a Nernstian response with good definition through a pH range from 2 to 10. In addition, hydrogen bonding enables the compound to sense the pH of unbuffered solutions with an error of less than 1%.

Graphical abstract: A novel sensor based on electropolymerized substituted-phenols for pH detection in unbuffered systems

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Article information


Submitted
28 Oct 2015
Accepted
27 Nov 2015
First published
01 Dec 2015

RSC Adv., 2015,5, 104048-104053
Article type
Paper
Author version available

A novel sensor based on electropolymerized substituted-phenols for pH detection in unbuffered systems

C. Dai, L. P. Crawford, P. Song, A. C. Fisher and N. S. Lawrence, RSC Adv., 2015, 5, 104048 DOI: 10.1039/C5RA22595G

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