A novel pH potentiometric sensor based on electrochemically synthesized polybisphenol A films at an ITO electrode

作者：Li, Qian; Li, Hong^*; Zhang, Jin; Xu, Zhenghe

来源：Sensors and Actuators B: Chemical , 2011, 155(2): 730-736.

DOI：10.1016/j.snb.2011.01.038

• pH sensor
• Bisphenol A
• Electropolymerized films
• ITO

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.

• 出版日期2011-7-20
• 单位华南师范大学