Highly Sensitive and Selective Determination of Dopamine in the Presence of Ascorbic Acid Using Pt@Au/MWNTs Modified Electrode |
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Authors: | Yan‐Cui Bai Wei‐De Zhang |
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Institution: | Nano Science Research Center, School of Chemistry and Chemical Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510640, P.?R. China |
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Abstract: | Nanoparticles containing platinum and gold supported on MWNTs (Pt@Au/MWNTs) were successfully prepared by successive reduction. A novel sensor was fabricated with Pt@Au/MWNTs nanocomposite modified glassy carbon electrode coating with nafion. Compared with the previous reports, the electrode exhibited greatly improved performance towards the oxidation and determination of dopamine in the presence of ascorbic acid. A higher sensitivity of 1.16 mA cm?2 mM?1 with a wider linear concentration range of dopamine up to 120 μM and a low detection limit of 8.0×10?8 M were obtained in neutral solution. Moreover, the modified electrode presented high stability and reproducibility. The interference of ascorbic acid can be eliminated effectively. The present work provides a simple and practical approach to selective detection of dopamine in the presence of ascorbic acid. |
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Keywords: | Nanoparticles Carbon nanotubes Dopamine Electroanalysis Platinum Gold |
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