Effects of thin-layer diffusion in the electrochemical detection of nicotine on basal plane pyrolytic graphite (BPPG) electrodes modified with layers of multi-walled carbon nanotubes (MWCNT-BPPG)
Effects of thin-layer diffusion in the electrochemical detection of nicotine on basal plane pyrolytic graphite (BPPG) electrodes modified with layers of multi-walled carbon nanotubes (MWCNT-BPPG)
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DOI：
10.1016/j.snb.2009.10.055
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发表时间：
2010-01-29
影响因子：
8.4
通讯作者：
Compton, Richard G.
中科院分区：
文献类型：
--
作者：
Sims, Marcus J.;Rees, Neil V.;Compton, Richard G.
在多壁碳纳米管修饰基面热解石墨(MWCNT-BPPG)电极上测量了尼古丁在水溶液中的氧化电化学。尼古丁的定量检测的检出限为1.5微米(以3西格玛为基础)，线性范围至少为1毫米。发现了包括薄层(在MWCNT层内)以及半无限(来自整体溶液)扩散特征的质量传输机制的证据，进一步说明了许多基于多孔和多壁碳纳米管的修饰电极所声称的电催化性能的基本来源可能至少在某些情况下是质量传输效应的线索，而不是改性层的电子或结构特性。(C)2009爱思唯尔B.V.保留所有权利。
The oxidative electrochemistry of nicotine is measured in aqueous Solution at a multi-walled carbon nanotube modified basal plane pyrolytic graphite (MWCNT-BPPG) electrode. Quantitative detection of nicotine is obtained with a limit of detection of 1.5 mu M (based on 3 sigma) and a linear range of at least up to I mM. Evidence is found for a mass transport regime that includes thin-layer (within the MWCNT layers) as well as semi-infinite (from bulk solution) diffusional signatures, adding to the growing picture that the fundamental Source of the 'electrocatalytic' properties claimed of many porous and multi-walled carbon nanotube-based modified electrodes may, at least in some cases, be clue to mass transport effects rather than electronic or structural peculiarities of the modifying layers. (C) 2009 Elsevier B.V. All rights reserved.