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An enhanced oxime-based biomimetic electrochemical sensor modified with multifunctional AuNPs–Co3O4–NG composites for dimethoate determination

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Abstract

An enhanced oxime-based electrochemical sensor decorated with gold nanoparticles (AuNPs) and Co3O4 hexagonal nanosheets coupled with nitrogen-doped graphene has been developed for dimethoate determination dramatically. The introduction of Co3O4 hexagonal nanosheets tackles agglomeration of AuNPs and also enhances the sensitivity of electrochemical sensors greatly. The structure and properties of the synthesized composites were characterized by scanning electron microscopy, X-ray diffraction, Raman spectroscopy and Fourier transform infrared spectroscopy, confirming the successful modification of 2-(4-mercaptobutoxy)-1-naphthaldehyde oxime and Co3O4 supported AuNPs in a great experiment. In addition, differential pulse voltammetry further revealed that the developed electrochemical sensor exhibited excellent selectivity, sensitivity and stability in real samples analysis. Under optimal conditions, the modified sensor displayed a broad linear range from 1 × 10−14 M to 1 × 10−6 M with a fairly low detection limit of 8.4 × 10−14 M (S/N = 3) and was expected to act as a superior method for dimethoate determination.

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Acknowledgements

We would like to appreciate all our group members for generous contribution in one way or another. This work was financially supported by the National Natural Science Foundation of China (31101284), the graduate research and innovation foundation of Chongqing, China (Grant No. CYS17017), the Fundamental Research Funds for the Central Universities (Nos. CQDXWL-2012-034, CQDXWL-2012-035, CDJPY1222 0001), and the Chongqing University Student Research Training Program (Nos. CQU-SRTP-2015497, CQU-SRTP-2015502).

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, People’s Republic of China

    **aoli Wang, Bin He, **g Nie, Wei Yin, Huanbao Fa & Changguo Chen

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  1. **aoli Wang
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  2. Bin He
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  3. **g Nie
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  4. Wei Yin
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  5. Huanbao Fa
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  6. Changguo Chen
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Correspondence to Wei Yin, Huanbao Fa or Changguo Chen.

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Wang, X., He, B., Nie, J. et al. An enhanced oxime-based biomimetic electrochemical sensor modified with multifunctional AuNPs–Co3O4–NG composites for dimethoate determination. Res Chem Intermed 44, 6689–6702 (2018). https://doi.org/10.1007/s11164-018-3516-8

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