Voltammetric PH Measurements Using Azure A-Containing Layer-by-Layer Film Immobilized Electrodes

Overview

Journal Polymers (Basel)

Publisher MDPI

Date 2020 Oct 15

PMID 33053708

Citations 2

Authors

Kazuhiro Watanabe

Kyoko Sugiyama

Sachiko Komatsu

Kentaro Yoshida

Tetsuya Ono

Tsutomu Fujimura

Yoshitomo Kashiwagi

Katsuhiko Sato

Affiliations

Soon will be listed here.

Abstract

pH is one of the most important properties associated with an aqueous solution and various pH measurement techniques are available. In this study, Azure A-modified poly(methacrylic acid) (AA-PMA) was synthesized used to prepare a layer-by-layer deposited film with poly(allylamine hydrochloride) (PAH) on a glassy carbon electrode via electrostatic interactions and the multilayer film-immobilized electrode was used to measure pH. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) measurement were performed. Consequently, the oxidation potential of AA on the electrode changed with pH. As per Nernst's equation, because H ions are involved in the redox reaction, the peak potential shifted depending on the pH of the solution. The peak potential shifts are easier to detect by DPV than CV measurement. Accordingly, using electrochemical responses, the pH was successfully measured in the pH range of 3 to 9, and the electrodes were usable for 50 repeated measurements. Moreover, these electrochemical responses were not affected by interfering substances.

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