A sensitive electrochemical sensor based on polypyrrole/electrochemically reduced graphene oxide for the determination of imidacloprid

Authors

  • Chenglong Chen School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094
  • Zhen Han School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094
  • Wu Lei School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094
  • Yong Ding School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094
  • Jingjing Lv School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094
  • Mingzhu Xia School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094
  • Fengyun Wang School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094
  • Qingli Hao School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094

DOI:

https://doi.org/10.5599/jese.630

Keywords:

Electro-polymerization, modified electrode, imidacloprid insecticide, electrochemical behavior, actual samples
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Abstract

The glassy carbon electrode (GCE) was modified by electrochemically reduced graphene oxide (ERGO) and polypyrrole (PPy) prepared by simple cyclic voltammetry (CV) electropoly­merization. The PPy/ERGO modified electrode (PPy/ERGO/GCE) was used as a platform of electrochemical sensor to detect imidacloprid (IMI) insecticide. CV and differential pulse voltammetry (DPV) were chosen as the methods to investigate of the electrochemical behavior of IMI on PPy/ERGO/GCE surface. Scanning electron microscopy (SEM) and Raman spectra were utilized to describe the morphology and structure of the modified electrode. Experimental parameters were optimized, such as the number of polymerization cycles, scan rate and the pH value of electrolyte. Under the optimized conditions, when the concentration of IMI was in the range of 1-10 μM and 10-60 μM, the increase of reduction peak current was linear with the concentration of IMI, and the low detection limit was found to be 0.18 μM (S/N = 3). Results showed that PPy/ERGO/GCE demonstrated satisfactory reproducibility and stability, and has great potential in actual sample testing.

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Published

06-05-2019

How to Cite

Chen, C., Han, Z., Lei, W., Ding, Y., Lv, J., Xia, M., Wang, F., & Hao, Q. (2019). A sensitive electrochemical sensor based on polypyrrole/electrochemically reduced graphene oxide for the determination of imidacloprid. Journal of Electrochemical Science and Engineering, 9(3), 143–152. https://doi.org/10.5599/jese.630

Issue

Vol. 9 No. 3 (2019)

Section

Electrochemical Science

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