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Sensors 2011, 11(6), 5873-5885; doi:10.3390/s110605873

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

Green Technology Research Center, Department of Chemical and Materials Engineering, Chang Gung University, Tao-Yuan 33302, Taiwan
Biosensor Group, Biomedical Engineering Research Center, Chang Gung University, Tao-Yuan 33302, Taiwan
Electronics and Optoelectronics Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
Department of Chemical Engineering, Chung Yuan University, Tao-Yuan 33023, Taiwan
Author to whom correspondence should be addressed.
Received: 30 March 2011 / Revised: 25 May 2011 / Accepted: 30 May 2011 / Published: 31 May 2011
(This article belongs to the Section Chemical Sensors)
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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.
Keywords: polyaniline; polyacrylic acid; enzyme-free; hydrogen peroxide sensor polyaniline; polyacrylic acid; enzyme-free; hydrogen peroxide sensor
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Hua, M.-Y.; Chen, C.-J.; Chen, H.-C.; Tsai, R.-Y.; Cheng, W.; Cheng, C.-L.; Liu, Y.-C. Preparation of a Porous Composite Film for the Fabrication of a Hydrogen Peroxide Sensor. Sensors 2011, 11, 5873-5885.

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