Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 9, Issue 7, Pages 1816-1823Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2007.04.004
Keywords
V-type nerve agents detection; nickel powder; basal plane pyrolytic graphite; electrocatalysis; single-walled carbon nanotube; impedance spectroscopy
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This communication describes the electron transport. behaviour of basal plane pyrolytic graphite electrodes (BPPGEs) modified with nickel powder (BPPGE-Ni), single-walled carbon nanotube (BPPGE-SWCNT) and BPPGE-Ni decorated with SWCNT via drop-dry method (BPPGE-Ni-SWCNT). The BPPGE-Ni gave enhanced Faradaic response for the redox probe (Ferricyanide/Ferrocyanide species) and also displayed enhanced electrocatalytic behaviour towards the detection of degradation products of V-type nerve agents, dimethylaminoethanethiol (DMAET) and diethylaminoethanethiol (DEAET) with high sensitivity (similar to 23 x 10(-3) AM(-1)) and low detection limits (4.0-9.0 mu M range). When compared to the notable electrodes and detection protocols reported in the literature, BPPGE-Ni exhibits more promising features required for a simple, highly sensitive, fast and less expensive electrode for the detection of these V-type nerve agents in aqueous solution. The efficient response of the BPPGE-Ni is attributed to the high microscopic surface area of the nickel powder. The poor response of the BPPGE-Ni-SWCNT suggests that nickel impurity in the SWCNT did not show any detectable impact on its electron transfer kinetics. (C) 2007 Elsevier B.V. All rights reserved.
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