He Ning, Gao Mingliang, Shen Dunpu, Li Hongda, Han Zhengbo, Zhao Pengcheng
Department of Forensic Chemistry, Criminal Investigation Police University of China, Shenyang 110035, China.
College of Chemistry, Liaoning University, Shenyang 110035, China.
Forensic Sci Int. 2019 Apr;297:1-7. doi: 10.1016/j.forsciint.2019.01.004. Epub 2019 Jan 29.
Rapid field screening is enormously important in forensic analysis of explosives. In this article, we used a methodology based on a strong red-fluorescent europium-organic framework (Eu-MOF) material for sensitive and selective detection of picric acid, TNT, and tetryl using the fluorescence quenching effect. Results indicate that Eu-MOF can be used for the visual detection of these three explosives with low detection limits (20-140 μg/mL) and high quenching efficiency (Ksv > 10 M). Furthermore, this material can be recycled just by washing it with ethanol. The fluorescence quenching mechanism is also discussed. Importantly, we prepared a portable test strip that can be used for sensing TNT, and using this, we achieved a rapid field test for explosives. Consequently, Eu-MOF is a promising candidate material for use as an explosive optical sensor.
快速现场筛查在爆炸物的法医分析中极为重要。在本文中，我们采用了一种基于强红色荧光铕有机框架（Eu-MOF）材料的方法，利用荧光猝灭效应灵敏且选择性地检测苦味酸、三硝基甲苯（TNT）和特屈儿。结果表明，Eu-MOF可用于这三种爆炸物的可视化检测，检测限低（20 - 140μg/mL）且猝灭效率高（Ksv > 10 M）。此外，这种材料只需用乙醇洗涤即可回收利用。还讨论了荧光猝灭机制。重要的是，我们制备了一种可用于传感TNT的便携式测试条，并以此实现了爆炸物的快速现场检测。因此，Eu-MOF是用作爆炸物光学传感器的一种很有前景的候选材料。
