Visualization of Charge-Transfer Complex for the Detection of 2,4,6-Trinitrotoluene Using Terahertz Chemical Microscope
Visualization of Charge-Transfer Complex for the Detection of 2,4,6-Trinitrotoluene Using Terahertz Chemical Microscope
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使用太赫兹化学显微镜可视化电荷转移复合物检测 2,4,6-三硝基甲苯
DOI：
10.1149/1945-7111/ac3a2c
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
jin Wang
中科院分区：
文献类型：
--
作者：
Jin Wang;Keiji Sakai and Toshihiko Kiwa;jin Wang
研究了电荷转移配合物Meisenheimer配合物的可视化方法，并通过太赫兹化学显微镜（TCM）成像系统对不带电的2，4，6-三硝基甲苯（TNT）炸药进行检测。将有机胺3-氨丙基三乙氧基硅烷（APTES）固定在涂有SiO2膜的TCM传感板上，并与TNT分子发生相互作用。绘制了TNT、APTES和电荷转移复合物的表面电位分布。由于富电子氨基硅烷APTES和缺电子TNT分子在传感板表面上形成电荷转移复合物，发生了电位偏移。通过测量这种电位漂移所产生的太赫兹脉冲的幅值，实现了利用TCM成像系统对TNT炸药的电成像和检测。使用N-（2-氨乙基）-3-氨丙基三甲氧基硅烷和N1-（3-三甲氧基甲硅烷基丙基）二亚乙基三胺进一步评价和比较胺-TNT相互作用引起的颜色变化。结果表明，TCM成像是一种很有前途的方法，用于检测低浓度（百万分之几）的不带电TNT炸药。
This study focuses on the visualization of a charge-transfer complex, namely a Meisenheimer complex, for the detection of uncharged 2, 4, 6-trinitrotoluene (TNT) explosives by developing a terahertz chemical microscope (TCM) imaging system. The organic amine 3-aminopropyltriethoxysilane (APTES) was immobilized on an SiO 2-film-coated TCM sensing plate, where it interacted with TNT molecules. The surface electrical potential distribution of TNT, APTES, and the charge-transfer complex was mapped. An electrical potential shift occurred due to the formation of a charge-transfer complex between the electron-rich amino-silane APTES and electron-deficient TNT molecules on the surface of the sensing plate. The electrical imaging and detection of TNT explosives by using the TCM imaging system were demonstrated by measuring the amplitude of the terahertz pulse caused by this electrical potential shift. N-(2-Aminoethyl)-3-aminopropyltrimethoxysilane and N1-(3-trimethoxysilylpropyl) diethylenetriamine were used for further evaluation and comparison of color changes arising from the amine-TNT interactions. The results have shown that TCM imaging is a promising method for the detection of uncharged TNT explosives at a low (sub-parts-per-million) concentration.