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Hydrogen-bond acidic polymers coated SAW sensors for 2,4-dinitrotoluene detection

机译：氢键酸性聚合物涂覆的SAW传感器，用于2,4-二硝基甲苯检测

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摘要

Two strong hydrogen-bond acidic (HBA) polymers DKAP and PLF, were coated onto 434 MHz surface acoustic wave (SAW) devices for rapid detection of an explosive compound, 2,4-dinitrotoluene (2,4DNT). Sensitivity and selectivity of the polymer-coated sensors were studied by exposure to 2,4-DNT in the concentration range of 200 ppb to 1 ppm, as well as some common interferences at higher concentrations. The results showed that the DKAP sensor has a 4.6 times higher sensitivity to 2,4-DNT than PLF at the concentration of 1 ppm, while a further comparison indicated that their sensitivities to dimethyl methylphosphonate (DMMP) are essentially identical. The superior sensitive performance of DKAP to nitroaromatics as compared to PLF can be attributed to the dipolarity induced by the aromatic ring segments, which promotes pi-pi p interactions between the explosive vapor and the polymer coating. In addition, the DKAP sensor exhibits a high response of 4.6 kHz to 200 ppb 2,4-DNT, with an extrapolated limit of detection (LOD) of 0.1 ppb, which is comparable to most sensitive polymer-coated sensors previously reported. Furthermore, both adsorption and recovery time of the DKAP sensor is much shorter than other related sensors. Sensor responses to possible common interferences are found to be 11-35 fold lower than to 2,4-DNT. In situ infrared spectroscopy studies were performed to demonstrate the hydrogen bonding between nitroaromatic compounds and the chemoselective polymers.
机译：将两种强氢键酸性（HBA）聚合物DKAP和PLF涂覆到434 MHz声表面波（SAW）装置上，以快速检测爆炸性化合物2,4-二硝基甲苯（2,4DNT）。通过在200 ppb到1 ppm的浓度范围内暴露于2,4-DNT以及较高浓度下的一些常见干扰，研究了聚合物涂层传感器的灵敏度和选择性。结果表明，在浓度为1 ppm的情况下，DKAP传感器对2,4-DNT的敏感性是PLF的4.6倍，而进一步的比较表明，它们对甲基膦酸二甲酯（DMMP）的敏感性基本相同。与PLF相比，DKAP对硝基芳族化合物的优异敏感性能可归因于芳环段引起的偶极性，从而促进了爆炸性蒸气与聚合物涂层之间的pi-pi p相互作用。另外，DKAP传感器对200 ppb 2,4-DNT表现出4.6 kHz的高响应，外推的检测限（LOD）为0.1 ppb，与以前报道的大多数敏感聚合物涂层传感器相当。此外，DKAP传感器的吸附和恢复时间都比其他相关传感器短得多。发现传感器对可能的常见干扰的响应比对2,4-DNT的响应低11-35倍。进行了原位红外光谱研究，以证明硝基芳族化合物与化学选择性聚合物之间的氢键键合。

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