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A magnetic CoFe2O4/SiO2 nanocomposite fabricated by the sol-gel method for electrocatalytic oxidation and determination of L-cysteine

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Abstract

Magnetic CoFe2O4/SiO2 spinel-type nanocomposites have been fabricated by a sol-gel method in the presence of various acids. Their structural, morphological and magnetic properties were characterized by XRD, SEM, TEM, FTIR, VSM and EDX which revealed that they are formed in the presence of all precursors. TEM analysis indicates homogeneous and porous spherical morphology with nanosize grains 10–20 nm in diameter in the presence of salicylic acid. Electrochemical sensor application of nanocrystalline CoFe2O4/SiO2 synthesized by salicylic acid for determination of L-cysteine was investigated using differential pulse voltammetry (DPV) and cyclic voltammetry (CV). DPV indicates that the sensor shows remarkable sensitivity for the determination of L-Cys. The response of a glassy carbon electrode modified with CoFe2O4/SiO2 is linear in the 0.02–425 μM L-Cys concentration range, with a 0.20 μM detection limit (at an S/N ratio of 3). The electrode produces a negligible current response for tryptophan, glutamic acid and citric acid at the working potential applied (+0.748 V vs Ag/AgCl). The electrode is reliable, simple, rapidly prepared, precise, and the method does not require extensive sample treatment.

A CoFe2O4/SiO2 magnetic nanocomposite was synthesized by a sol-gel auto combustion method in the presence of various acids as precursors. A highly sensitive electrochemical sensor was fabricated for determination of trace amount of L-cysteine using a glassy carbon electrode modified with the nanocomposite.

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Acknowledgements

The authors are grateful to the Council of Iran National Science Foundation and University of Kashan for supporting this work by Grant No (159271/204).

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  1. Institute of Nano Science and Nano Technology, University of Kashan, P.O. Box 87317-51167, Kashan, Islamic Republic of Iran

    Mahnaz Amiri, Masoud Salavati-Niasari & Ahmad Akbari

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  1. Mahnaz Amiri
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Correspondence to Masoud Salavati-Niasari.

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Amiri, M., Salavati-Niasari, M. & Akbari, A. A magnetic CoFe2O4/SiO2 nanocomposite fabricated by the sol-gel method for electrocatalytic oxidation and determination of L-cysteine. Microchim Acta 184, 825–833 (2017). https://doi.org/10.1007/s00604-016-2064-4

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