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Citation: XUE Xiao-Kang, GUO Xing-Peng, YU Cheng-Ping. Preparation of a Potentiometric pH Sensor Based on Polypyrrole[J]. Chinese Journal of Applied Chemistry, ;2005, 22(4): 435-439. shu

Preparation of a Potentiometric pH Sensor Based on Polypyrrole

1.
Department of Chemistry, Huazhong University of Science and Technology, Wuhan 430074

Corresponding author: GUO Xing-Peng,
Received Date: 4 June 2004
Available Online: 18 October 2004

A pH sensor was fabricated from polypyrrole (PPy) on Pt wire.PPy was prepared electrochemically in a 0.1 mol/L Py aqueous solution with or without addition of 0.1 mol/L NaHCO₃ and characterized by means of infrared absorption spectroscopy (IR) and electrochemical impedance spectroscopy (EIS).The Nyquist plots for non-doped PPy in an acid solution (pH=4.01),a neutral solution (pH=6.85),and an alkali solution (pH=9.14) were composed of two semicircles in the high and mid frequency regions and a Warburg response arisen by H⁺ diffusion process in the low frequency region.The Nyquist plots for HCO₃^--doped PPy in corresponding pH buffer solutions were composed of two semicircles in the tested frequency region and did not show the Warburg response.In the latter case,the charge transfer resistance and the film resistance of PPy were increased apparently.The electrochemically synthesized non-doped PPy as a pH-indicator electrode had satisfactory potentiometric properties:sub-Nernstian response with a slope of 49.32 mV/pH at buffer solutions of pH 3 to 10,excellent linearity,r=-0.997 1,and relatively short response time and small selectivity coefficient to conventional positive ions such as K⁺ and Na⁺.
- polypyrrole,
- pH sensor,
- electrochemical polymerization,
- AC impedance
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