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Polypyrrole and graphene quantum dots @ Prussian Blue hybrid film on graphite felt electrodes: Application for amperometric determination of l -cysteine

Abstract : A novel polypyrrole (PPy) and graphene quantum dots (GQDs) @ Prussian Blue (PB) nanocomposite has been grafted on a graphite felt (GF) substrate (PPy/GQDs@PB/GF), and has been proven to be an efficient electrochemical sensor for the determination of l-cysteine (l-cys). GQDs, which were fabricated by carbonization of citric acid and adsorbed on GF surface ultrasonically, played an important role for promoting the synthesis process of PB via a spontaneous redox reaction between Fe3+ and [Fe(CN)6]3−. The PPy film has been electro-polymerized to improve the electrochemical stability of the PPy/GQDs@PB/GF electrode. The as-prepared electrode was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), infrared spectroscopy (IR), X-ray diffraction (XRD) and electrochemical methods. It exhibited an excellent activity for the electrocatalytic oxidation of l-cys, with a detection sensitivity equal to 0.41 A mol−1 L for a concentration range of 0.2–50 μmol L−1, and equal to 0.15 A mol−1 L for a concentration range of 50–1000 μmol L−1. A low detection limit of 0.15 μmol L−1, as well as a remarkable long-time stability and a negligible sensitivity to interfering analytes, were also ascertained.
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Journal articles
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https://hal.insa-toulouse.fr/hal-02018202
Contributor : Insa Toulouse Scd <>
Submitted on : Wednesday, February 13, 2019 - 4:35:47 PM
Last modification on : Tuesday, March 3, 2020 - 11:40:04 AM

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  • HAL Id : hal-02018202, version 1

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Lei Wang, Simon Tricard, Pengwei Yue, Jihua Zhao, Jian Fang, et al.. Polypyrrole and graphene quantum dots @ Prussian Blue hybrid film on graphite felt electrodes: Application for amperometric determination of l -cysteine. Biosensors and Bioelectronics, Elsevier, 2016, 77, pp.1112-1118. ⟨hal-02018202⟩

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