A novel pH potentiometric sensor based on electrochemically synthesized polybisphenol A films at an ITO electrode |
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| Authors: | Qian LiAuthor VitaeHong LiAuthor Vitae Jin ZhangAuthor VitaeZhenghe XuAuthor Vitae |
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| Affiliation: | a Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China
b Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada T6G 2G6 |
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| Abstract: | A polymer-based pH electrode has been successfully fabricated via a simple electropolymerization of bisphenol A (BPA) on an indium tin oxide (ITO) electrode using repetitive voltammetric sweeping. A combination of voltammetry, electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy revealed that polybisphenol A (PBPA) films with benzoquinonyl and hydroquinonyl groups not only showed basically reversible redox activities, but also exhibited the mixed ionic-electronic conductivity. The redox peak potential and open circuit potential using the PBPA/ITO electrode as a pH sensor presented response slopes of −58.6 ± 1.4 mV/pH and −56.7 ± 1.6 mV/pH, respectively. The potentiometric signals were stable in electrolyte solutions and displayed a wide response range for the detection of pH. Compared with the commercial glass pH electrode, the PBPA-based electrode showed several advantages including easy fabrication, low cost, high stability and selectivity. |
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| Keywords: | pH sensor Bisphenol A Electropolymerized films ITO |
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