Journal
ELECTROANALYSIS
Volume 21, Issue 16, Pages 1811-1815Publisher
WILEY-BLACKWELL
DOI: 10.1002/elan.200904607
Keywords
Nanotubes; Ruthenium dioxide; Dopamines; Electroanalysis
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Funding
- Natural Science Foundation of China [20773041]
- Research Fund for the Doctoral Program of Higher Education [20070561008]
- High Technology Research Program
- Ministry of Science and Technology (MOST) of China [2008AA06Z311]
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Electrochemical behavior of dopamine at the RuO2-modified vertically aligned carbon nanotubes electrode was investigated by cyclic voltammetry, differential pulse voltammetry and chronoamperometry. ne RuO2-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 RuO2/MWNTs electrode exhibited I wide detection range up to 3.6 X 10(-3) M with detection limit of 6.0 x 10(-8) M (signal/noise = 3) for dopamine determination. Meanwhile, the optimized sensor for dopamine displayed a sensitivity of 83.8 mu A 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 RuO2/MWNTs electrode presents stable, highly sensitive, favorable selectivity and fast amperometric response of dopamine.
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