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Electroanalysis of Dopamine at RuO 2 Modified Vertically Aligned Carbon Nanotube Electrode
Author(s) -
Jiang LiaoChuan,
Zhang WeiDe
Publication year - 2009
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.200904607
Subject(s) - chronoamperometry , electrode , ascorbic acid , cyclic voltammetry , amperometry , differential pulse voltammetry , carbon nanotube , materials science , detection limit , electrocatalyst , electrochemistry , analytical chemistry (journal) , inorganic chemistry , chemistry , chemical engineering , nanotechnology , chromatography , engineering , food science
Electrochemical behavior of dopamine at the RuO 2 ‐modified vertically aligned carbon nanotubes electrode was investigated by cyclic voltammetry, differential pulse voltammetry and chronoamperometry. The RuO 2 ‐modified carbon nanotube electrode showed higher electrocatalytic activity towards the oxidation of dopamine than the MWNTs electrode in 0.10 M phosphate buffer solution. At an applied potential of +0.4 V, the RuO 2 /MWNTs electrode exhibited a wide detection range up to 3.6×10 −3 M with detection limit of 6.0×10 −8 M (signal/noise=3) for dopamine determination. Meanwhile, the optimized sensor for dopamine displayed a sensitivity of 83.8 μA mM −1 and response time of 5 s with addition of 0.20 mM dopamine. In addition, DPV experiment revealed that interfering species such as ascorbic acid and uric acid could be effectively avoided. The RuO 2 /MWNTs electrode presents stable, highly sensitive, favorable selectivity and fast amperometric response of dopamine.