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A novel electrochemical sensor based on Fe2O3 nanoparticles/N-doped graphene for electrocatalytic oxidation of L-cysteine

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Abstract

A novel electrochemical sensor based on Fe2O3 nanoparticles supported on N-doped graphene (Fe2O3NPs/N–GR) has been fabricated for electrocatalytic oxidation and detection of L-cysteine. The Fe2O3NPs/N–GR was characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), and electrochemical methods. The electrochemical behavior of L-cysteine at Fe2O3NPs/N–GR was investigated by voltammetry. The Fe2O3NPs/N–GR showed a very efficient electrocatalytic activity for the oxidation of L-cysteine in 0.1 M phosphate buffer solution (PBS, pH 7.0). The oxidation peak currents increased dramatically at Fe2O3NPs/N–GR-modified electrode. The potential utility of the sensor was demonstrated by applying it to the analytical determination of L-cysteine. Experimental results showed that the electrocatalytic current increased linearly with L-cysteine concentration in the range of 0.2–400 μM with a lowest detectable concentration of 0.1 μM.

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Acknowledgments

The authors gratefully acknowledge the financial support from Nature Science Foundation of Anyang Normal University and National Natural Science Foundation of China (NSFC, No. 21102005).

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, 455002, People’s Republic of China

    Suling Yang, Gang Li, Guifang Wang, Dehua Deng & Lingbo Qu

  2. Chemistry and Chemical Engineering School, Henan University of Technology, Zhengzhou, 450001, People’s Republic of China

    Lingbo Qu

Authors
  1. Suling Yang
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  2. Gang Li
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  3. Guifang Wang
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  4. Dehua Deng
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  5. Lingbo Qu
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Correspondence to Lingbo Qu.

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Yang, S., Li, G., Wang, G. et al. A novel electrochemical sensor based on Fe2O3 nanoparticles/N-doped graphene for electrocatalytic oxidation of L-cysteine. J Solid State Electrochem 19, 3613–3620 (2015). https://doi.org/10.1007/s10008-015-2980-y

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  • DOI: https://doi.org/10.1007/s10008-015-2980-y

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