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Analytical and Bioanalytical Chemistry

, Volume 379, Issue 2, pp 302–307 | Cite as

Capacitive chemical sensor for fenvalerate assay based on electropolymerized molecularly imprinted polymer as the sensitive layer

  • Ji-Lai Gong
  • Fu-Chun Gong
  • Ying Kuang
  • Ge-Ming Zeng
  • Guo-Li Shen
  • Ru-Qin YuEmail author
Original Paper

Abstract

A capacitive chemical sensor for fenvalerate is reported. By using ac impedance measurements the sensor has been based on the decrease in capacitance caused by the analyte used as the template in the formulation of an electropolymerized molecularly imprinted polymer as receptor layer. Improvement of the insulating properties of the sensor was investigated in detail. The capacitive sensor was prepared by a deposition of a self-assembled monolayer of 2-mercaptobenzimidazole (2-MBI) before electropolymerization of 2-MBI and subsequent treatment with n-dodecanethiol to eliminate pinholes and defects in the polymerized 2-MBI film. From the calibration curve concentrations of fenvalerate up to 9 μg mL−1 could be detected with a linear determination range up to 5 μg mL−1 and a detection limit of 0.36 μg mL−1. No significant interference was observed from common pyrethroid insecticides.

Keywords

Fenvalerate Electropolymerized polymer Electrochemical impedance spectroscopy Capacitive sensor 

Notes

Acknowledgments

The authors thank the following organizations for financial support: the National Natural Science Foundation of China (grants 20075006, 29975006, and 29735150), Science Commission of Hunan Province.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Ji-Lai Gong
    • 1
  • Fu-Chun Gong
    • 1
  • Ying Kuang
    • 1
  • Ge-Ming Zeng
    • 1
  • Guo-Li Shen
    • 1
  • Ru-Qin Yu
    • 1
    Email author
  1. 1.State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical EngineeringHunan UniversityChangshaP.R. China

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