A novel sensor based on electropolymerized substituted-phenols for pH detection in unbuffered systems?
RSC Advances Pub Date: 2015-12-01 DOI: 10.1039/C5RA22595G
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%.
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Journal Name：RSC Advances
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CAS no.: 89640-58-4
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