Journal
MICROCHIMICA ACTA
Volume 170, Issue 1-2, Pages 53-58Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-010-0371-8
Keywords
Adenine; 1-butyl-3-methylimidazolium hexafluorophosphate; Multi-walled carbon nanotubes; Cyclic voltammetry; Carbon ionic liquid electrode
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Funding
- Shandong Province Natural Science Foundation [ZR2009BL017]
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A voltammetric sensor was fabricated by applying a Nafion and multi-walled carbon nanotubes (MWCNTs) composite film on the surface of a carbon ionic liquid electrode (CILE), which was prepared by mixing 1-butyl-3-methylimidazolium hexafluorophosphate with graphite powder. The electrochemical behavior of adenine on the Nafion-MWCNTs/CILE was investigated in pH 5.5 buffer solution. Adenine showed an irreversible adsorption-controlled oxidation reaction with enhanced electrochemical response, which was due to the presence of high conductive MWCNTs on the CILE surface. The electrochemical parameters of adenine electro-oxidation were determined, and the experimental conditions were optimized. Under the optimal conditions, the oxidation peak current was linear to the adenine concentration over the range of 1.0 x 10(-7) to 7.0 x 10(-5) mol L(-1) with a detection limit of 3.3 x 10(-8) mol L(-1) (signal/noise = 3). The electrode showed good stability and selectivity, and was further applied to milk powder samples with satisfactory results.
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