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Highly Sensitive and Selective Determination of Dopamine in the Presence of Ascorbic Acid Using Pt@Au/MWNTs Modified Electrode
Author(s) -
Bai YanCui,
Zhang WeiDe
Publication year - 2010
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200900210
Subject(s) - ascorbic acid , detection limit , electrode , nafion , nanocomposite , platinum , coating , materials science , carbon nanotube , glassy carbon , nuclear chemistry , chemistry , inorganic chemistry , chemical engineering , chromatography , electrochemistry , nanotechnology , organic chemistry , catalysis , cyclic voltammetry , food science , engineering
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.