Journal
MICROCHIMICA ACTA
Volume 180, Issue 11-12, Pages 1037-1042Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-013-1028-1
Keywords
Reduced graphene oxide; Palladium nanoparticles; Dopamine; Electrochemical oxidation; Sensor
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Funding
- National Science Council
- Ministry of Education of Taiwan (Republic of China)
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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 mu M concentration range, and the detection limit is 0.233 mu M. The sensor was applied to the determination of DA in commercial DA injection solutions.
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