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

Selvakumar Palanisamy, Shuhao Ku, Shen Ming Chen

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    182 Scopus citations

    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. [Figure not available: see fulltext.]

    Original languageBritish English
    Pages (from-to)1037-1042
    Number of pages6
    JournalMicrochimica Acta
    Volume180
    Issue number11-12
    DOIs
    StatePublished - Aug 2013

    Keywords

    • Dopamine
    • Electrochemical oxidation
    • Palladium nanoparticles
    • Reduced graphene oxide
    • Sensor

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