Preparation of a Porous Composite Film for the Fabrication of a Hydrogen Peroxide Sensor

Sensors

Mu-Yi Hua¹  Chun-Jen Chen¹  Hsiao-Chien Chen¹  Rung-Ywan Tsai²  Wen Cheng³  Chun-Lin Cheng³ 

[1] Green Technology Research Center, Department of Chemical and Materials Engineering, Chang Gung University, Tao-Yuan 33302, Taiwan; E-Mails:;Electronics and Optoelectronics Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan; E-Mail:;Department of Chemical Engineering, Chung Yuan University, Tao-Yuan 33023, Taiwan; E-Mails:

关键词: polyaniline;    polyacrylic acid;    enzyme-free;    hydrogen peroxide sensor;   

DOI  :  10.3390/s110605873

来源: mdpi

【 摘 要 】

A series of dopant-type polyaniline-polyacrylic acid composite (PAn-PAA) films with porous structures were prepared and developed for an enzyme-free hydrogen peroxide (H₂O₂) sensor. The composite films were highly electroactive in a neutral environment as compared to polyaniline (PAn). In addition, the carboxyl group of the PAA was found to react with H₂O₂ to form peroxy acid groups, and the peroxy acid could further oxidize the imine structure of PAn to form N-oxides. The N-oxides reverted to their original form via electrochemical reduction and increased the reduction current. Based on this result, PAn-PAA was used to modify a gold electrode (PAn-PAA/Au) as a working electrode for the non-enzymatic detection of H₂O₂. The characteristics of the proposed sensors could be tuned by the PAA/PAn molar ratio. Blending PAA with PAn enhanced the surface area, electrocatalytic activity, and conductivity of these sensors. Under optimal conditions, the linear concentration range of the H₂O₂ sensor was 0.04 to 12 mM with a sensitivity of 417.5 μA/mM-cm². This enzyme-free H₂O₂ sensor also exhibited a rapid response time, excellent stability, and high selectivity.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.