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Issue 37, 2017
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GO/Fe3O4@SiO2 core–shell nanocomposite-modified graphite screen-printed electrode for sensitive and selective electrochemical sensing of dopamine and uric acid

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Abstract

Herein, we report the construction of GO/Fe3O4@SiO2 core–shell nanocomposite-modified graphite screen-printed electrode that shows advantageous characteristics in terms of electrical conductivity, catalytic activity and surface area compared to bare screen-printed electrode. The designed sensor was used for the determination of dopamine and uric acid. Cyclic voltammetry, differential pulse voltammetry and chronoamperometry methods were used as the diagnostics techniques. Using the modified electrode, dopamine and uric acid were determined in the concentration ranges from 0.1 to 600.0 μM and 0.75 to 300.0 μM, respectively, whereas the detection limits were found to be 8.9 × 10−8 M and 5.7 × 10−7 M, respectively. Finally, real sample analysis was done successfully using the modified electrode.

Graphical abstract: GO/Fe3O4@SiO2 core–shell nanocomposite-modified graphite screen-printed electrode for sensitive and selective electrochemical sensing of dopamine and uric acid

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Publication details

The article was received on 14 May 2017, accepted on 14 Aug 2017 and first published on 25 Aug 2017


Article type: Paper
DOI: 10.1039/C7AY01226H
Citation: Anal. Methods, 2017,9, 5541-5549
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    GO/Fe3O4@SiO2 core–shell nanocomposite-modified graphite screen-printed electrode for sensitive and selective electrochemical sensing of dopamine and uric acid

    H. Beitollahi, F. G. Nejad and S. Shakeri, Anal. Methods, 2017, 9, 5541
    DOI: 10.1039/C7AY01226H

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