Journal
ELECTROCHIMICA ACTA
Volume 53, Issue 26, Pages 7781-7788Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.05.053
Keywords
ionic liquid; multi-wall carbon nanotubes; gold nanoparticles; guanine; adenine
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Funding
- National Natural Science Foundation of China [20173040]
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, China
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A novel composite film, comprising of hydrophobic ionic liquid (IL), multi-walled carbon nanotubes (MWNTs) and gold nanoparticles (GNP), was fabricated and characterized. The GNP was introduced through electrochemical deposition on IL-MWNT gel film coated glassy carbon electrodes (GCE). Experiments showed that both IL and MWNTs could facilitate the GNP deposition. With GNP the composite film exhibited smaller electron transfer resistance and higher sensitivity in sensing guanine (G) and adenine (A). Under the optimized experimental conditions, the anodic peak currents were linear to the analyte concentration in the ranges of 0.008-2.0 mu M. The detection limits were down to nanomole level after an accumulation of 150 s on open-circuit. In addition, on the composite film coated GCE, the anodic peaks of G and A were well separated, and their response sensitivities kept almost unchanged no matter whether they coexisted or not. This proposed procedure was successfully applied to the detection of G and A in milk, plasma and urine samples. (C) 2008 Elsevier Ltd. All rights reserved.
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