Preparation of a porous composite film for the fabrication of a hydrogen peroxide sensor

Mu Yi Hua, Chun Jen Chen, Hsiao Chien Chen, Rung Ywan Tsai, Wen Cheng, Chun Lin Cheng, Yin Chih Liu

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)5873-5885
Number of pages13
JournalSensors
Volume11
Issue number6
DOIs
Publication statusPublished - 2011 Jun 1

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering

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  • Cite this

    Hua, M. Y., Chen, C. J., Chen, H. C., Tsai, R. Y., Cheng, W., Cheng, C. L., & Liu, Y. C. (2011). Preparation of a porous composite film for the fabrication of a hydrogen peroxide sensor. Sensors, 11(6), 5873-5885. https://doi.org/10.3390/s110605873