TY - JOUR
T1 - Visualization of charge-transfer complex for the detection of 2,4,6-trinitrotoluene using terahertz chemical microscope
AU - Wang, Jin
AU - Nagata, Hiroki
AU - Ando, Masaki
AU - Yoshida, Yuichi
AU - Sakai, Kenji
AU - Kiwa, Toshihiko
N1 - Funding Information:
This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, ), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. Japan Society for the Promotion of Science https://doi.org/10.13039/501100001691 Grant Number: 21K14169 Okayama Foundation for Science and Technology https://doi.org/10.13039/501100008972 yes . � 2021 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited http://creativecommons.org/licenses/by/4.0/
Funding Information:
This work was supported by the Okayama Foundation for Science and Technology and partially supported by the JSPS KAKENHI Grant-in-Aid for Early-Career Scientists (grant number: 21K14169).
Publisher Copyright:
© 2021 The Author(s).
PY - 2021/11
Y1 - 2021/11
N2 - 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 SiO2-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.
AB - 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 SiO2-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.
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U2 - 10.1149/1945-7111/ac3a2c
DO - 10.1149/1945-7111/ac3a2c
M3 - Article
AN - SCOPUS:85121115389
VL - 168
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
SN - 0013-4651
IS - 11
M1 - 117517
ER -
