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Highly selective and sensitive fluorescent zeolitic imidazole frameworks sensor for nitroaromatic explosive detection.
Nanoscale ( IF 5.8 ) Pub Date : 2020-06-15 , DOI: 10.1039/d0nr01653e
Osama Abuzalat 1 , Danny Wong 2 , Simon S Park 2 , Seonghwan Kim 2
Affiliation  

Nitroaromatic explosives, such as 2-4-6 trinitrotoluene (TNT) are dangerous materials that pose safety and environmental risks. Even though many sensors have been reported for the detection of nitroaromatic explosives, a facile, rapid, cost-effective sensor is still sought-after in the field. Here we demonstrate a facile and rapid method to synthesize a fluorescent metal–organic framework for the highly selective and sensitive detection of nitroaromatic explosives. Zeolitic imidazole framework-8 (ZIF-8) is synthesized and enhanced with fluorescent 8-hydroxyquinoline zinc (ZnQ). The synthesized material shows visible colour changes upon exposure to TNT from ivory to light red. In addition, fluorescence quenching is noted under UV illumination when the ZnQ@ZIF-8 is exposed to TNT. The ZnQ@ZIF-8-coated paper sensors show the highest fluorescence quenching at an emission wavelength of 455 nm with TNT concentration as low as 1 ppm. Therefore, the proposed strategy not only offers a fast and convenient protocol for selective detection of TNT but also offers great potential in practical applications, especially for airport/railway security inspection and prevention of terrorist attacks.

中文翻译:

高选择性和灵敏的荧光沸石咪唑骨架传感器,用于硝基芳香族爆炸物的检测。

硝基芳族炸药,例如2-4-6三硝基甲苯(TNT),是构成安全和环境风险的危险材料。尽管已经报道了许多用于检测硝基芳族爆炸物的传感器,但是在该领域中仍在寻求一种简便,快速,具有成本效益的传感器。在这里,我们演示了一种简便而快速的方法,可以合成用于高度选择性和灵敏地检测硝基芳香族炸药的荧光金属有机框架。合成了沸石咪唑骨架8(ZIF-8),并用荧光的8-羟基喹啉锌(ZnQ)进行了增强。合成材料在暴露于TNT时从象牙色变为浅红色时显示可见的颜色变化。此外,当ZnQ @ ZIF-8暴露于TNT时,在紫外线照射下会发生荧光猝灭。ZnQ @ ZIF-8涂层的纸传感器在455 nm的发射波长下具有最高的荧光猝灭,TNT浓度低至1 ppm。因此,所提出的策略不仅为选择性检测TNT提供了一种快速便捷的协议,而且在实际应用中尤其是在机场/铁路安全检查和防止恐怖袭击方面具有巨大的潜力。
更新日期:2020-07-02
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