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|標題:||Low potential detection of nicotine at multiwalled carbon nanotube-alumina-coated silica nanocomposite||作者:||Wang, S.J.
|關鍵字:||Nicotine;Multiwalled carbon nanotubes;Silica;Cyclic voltammetry;Amperometry;plane pyrolytic-graphite;electrochemical detection;modified;electrodes;nadh detection;biosensor;electroanalysis;nanoparticles;dispersion;tobacco;sites||Project:||Electrochemistry Communications||期刊/報告no：:||Electrochemistry Communications, Volume 11, Issue 4, Page(s) 733-735.||摘要:||
Electrocatalytic oxidation of nicotine at multiwalled carbon nanotube (MWCNT)-alumina-coated silica (ACS) nanocomposite modified glassy carbon electrode are described. The sensing performance of the MWCNT-ACS nanocomposite modified glassy carbon electrode for the electrooxidation of nicotine was investigated using cyclic voltammetry and amperometry in 0.1 M phosphate buffer solution (pH 8). The MWCNT-ACS nanocomposite modified glassy carbon electrode exhibited the abilities to decrease the electrooxidation potential, to prevent the electrode surface fouling, and to raise the current responses. The MWCNT-ACS nanocomposite responded rapidly to nicotine with a sensitivity of 1.786 A M(-1) cm(-2) and a detection limit of 1.42 mu M (according to 3 sigma criterion). A signal almost 180 times more sensitive was obtained at MWCNT-ACS nanocomposite modified glassy carbon electrodes as compared to bare glassy carbon electrode. The nicotine oxidation potential obtained in this study is much lower than that at boron-doped diamond electrodes. (C) 2009 Elsevier B.V. All rights reserved.
|Appears in Collections:||化學工程學系所|
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