Square wave voltammetric detection of 2,4,6-trinitrotoluene and 2,4-dinitrotoluene on a gold electrode modified with self-assembled monolayers
Square wave voltammetric detection of 2,4,6-trinitrotoluene and 2,4-dinitrotoluene on a gold electrode modified with self-assembled monolayers
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DOI：
10.1016/j.snb.2008.03.017
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发表时间：
2008-08-12
影响因子：
8.4
通讯作者：
Levicky, Rastislav
中科院分区：
文献类型：
--
作者：
Bozic, Robert G.;West, Alan C.;Levicky, Rastislav
采用旋转圆盘金电极（裸金电极和烷基乙醇自组装膜修饰金电极），测定了两种有机化合物2，4，6-三硝基甲苯（TNT）和2，4-二硝基甲苯（DNT）电化学还原的方波伏安微分电流响应。在裸电极上，背景电流将灵敏度限制在ppm水平。为了抑制这些干扰电流，金电极用各种链长的烷硫醇改性，从3到12个碳，具有亲水性（羟基）或疏水性（甲基）端基呈现给电解质。金电极被赋予羟基封端的单分子膜，使清晰的检测TNT和DNT从这两种化合物的混合物。此外，较长的烷硫醇允许的工作电位范围扩展到更多的负值比实现较短的烷硫醇。(C)2008 Elsevier B. V.保留所有权利。
A rotating disc gold electrode, either bare or modified with an alkanethiol self-assembled monolayer, was used to measure the simultaneous square wave voltammetric differential current response of the electrochemical reduction of the two ordnance-related compounds (ORCs) 2,4,6-trinitrotoluene (TNT) and 2,4-dinitrotoluene (DNT). On bare electrodes, background currents limited sensitivity to ppm levels. In order to suppress these interfering currents, the gold electrodes were modified with alkanethiols of various chain lengths, from 3 to 12 carbons, with hydrophilic (hydroxyl) or hydrophobic (methyl) end groups presented to the electrolyte. Gold electrodes endowed with hydroxyl-terminated monolayers enabled clear detection of TNT and DNT from mixtures of these two compounds. In addition, longer alkanethiols allowed extension of the working potential range to more negative values than achieved with shorter alkanethiols. (C) 2008 Elsevier B.V. All rights reserved.