Journal
MICROCHIMICA ACTA
Volume 175, Issue 3-4, Pages 309-314Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-011-0681-5
Keywords
Gold nanoparticles; Carbon nanotubes; Methyl parathion; Electrochemical sensor
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Funding
- Ministry of Science and Technology of China [2008AA06Z311]
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We report on an electrochemical sensor for the determination of methyl parathion. It is based on an electrode modified with multi-walled carbon nanotubes that were covered with gold nanoparticles (Au-NPs). The vertically aligned array of MWCNTs on a tantalum substrate was coated with Au-NPs by overhead magnetron sputtering deposition. Scanning and transmission electron microscopy and XRD were used to characterize the Au-NP-MWCNTs composite. Cyclic voltammetry and differential pulse voltammetry were employed to evaluate the suitability of the new electrode for the determination of methyl parathion. Under the optimal conditions, the current response of the electrode to methyl parathion is linear in the range from 0.50 to 16.0 mg mL(-1), with a detection limit of 50 mu g mL(-1) (signal/noise = 3), and the sensitivity is 4.5 times better than that of the plain MWCNTs electrode. We conclude that this method represents a simple, rapid, effective and sensitive approach for the detection of methyl parathion.
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