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Dopamine sensor based on a glassy carbon electrode modified with a reduced graphene oxide and palladium nanoparticles composite

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Abstract

We report on a sensitive electrochemical sensor for dopamine (DA) based on a glassy carbon electrode that was modified with a nanocomposite containing electrochemically reduced graphene oxide (RGO) and palladium nanoparticles (Pd-NPs). The composite was characterized by scanning electron microscopy, energy dispersive spectroscopy, and electrochemical impendence spectroscopy. The electrode can oxidize DA at lower potential (234 mV vs Ag/AgCl) than electrodes modified with RGO or Pd-NPs only. The response of the sensor to DA is linear in the 1–150 μM concentration range, and the detection limit is 0.233 μM. The sensor was applied to the determination of DA in commercial DA injection solutions.

Schematic representation showing the oxidation of DA at RGO-Pd-NPs composite electrode.

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Acknowledgments

This project was supported by the National Science Council and the Ministry of Education of Taiwan (Republic of China).

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Authors and Affiliations

  1. Electroanalysis and Bioelectrochemistry Lab, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No.1, Section 3, Chung-Hsiao East Road, Taipei, 106, Taiwan, Republic of China

    Selvakumar Palanisamy, Shuhao Ku & Shen-Ming Chen

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  1. Selvakumar Palanisamy
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  2. Shuhao Ku
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  3. Shen-Ming Chen
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Correspondence to Shen-Ming Chen.

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Palanisamy, S., Ku, S. & Chen, SM. Dopamine sensor based on a glassy carbon electrode modified with a reduced graphene oxide and palladium nanoparticles composite. Microchim Acta 180, 1037–1042 (2013). https://doi.org/10.1007/s00604-013-1028-1

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  • DOI: https://doi.org/10.1007/s00604-013-1028-1

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