Novel Signal-Amplifying Fluorescent Nanofibers for Naked-Eye-Based Ultrasensitive Detection of Buried Explosives and Explosive Vapors
Novel Signal-Amplifying Fluorescent Nanofibers for Naked-Eye-Based Ultrasensitive Detection of Buried Explosives and Explosive Vapors
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DOI：
10.1002/adfm.201200047
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发表时间：
2012-09-11
影响因子：
19
通讯作者：
Lei, Yu
中科院分区：
文献类型：
--
作者：
Wang, Ying;La, Anthony;Lei, Yu
利用静电纺丝技术制备了一种新型的具有分子导线功能的荧光纳米纤维膜，用于紫外光激发下超痕量硝基爆炸物蒸气和地下爆炸物的肉眼检测。缺电子硝基炸药和传感膜之间的高结合亲和力导致其荧光发射的快速、显著的淬灭。从1 ng炸药残留物中释放出的亚平衡蒸气（分别小于10 ppb、74 ppt、5 ppt、7 ppt和0.1ppt），可目视检测到广泛的硝基炸药，特别是TNT、Tetryl、RDX、PETN和HMX。这种出色的传感性能可以归因于所提出的芘和PS的苯基侧基之间的类Pyrene-like构象，其可以允许类似于分子线的有效的长程能量迁移，从而实现放大的荧光猝灭。还演示了它在用肉眼探测埋在土壤中的爆炸物方面的应用，显示了它在地雷测绘方面的潜在应用。据我们所知，这是第一份关于在不使用任何先进分析仪器的情况下探测埋在地下的爆炸物的报告。
A novel electrospun fluorescent nanofiberous membrane with a function like molecular wires was developed via electrospinning for the detection of ultra-trace nitro explosive vapors and buried explosives by naked eye under UV excitation. The high binding affinity between the electron-deficient nitro explosives and the sensing film results in a rapid, dramatic quenching in its fluorescence emission. A wide spectrum of nitro explosives, in particular, TNT, Tetryl, RDX, PETN and HMX could be visually detected at their sub-equilibrium vapors (less than 10 ppb, 74 ppt, 5 ppt, 7 ppt and 0.1 ppt, respectively) released from 1 ng explosives residues. Such outstanding sensing performance could be attributed to the proposed sandwich-like conformation between pyrene and phenyl pendants of PS which may allow efficient long-range energy migration similar to molecular wire, thus achieving amplified fluorescence quenching. Its application for the detection of buried explosives in soil by naked eye was also demonstrated, indicating its potential application for landmine mapping. To the best of our knowledge, this is the first report about the detection of buried explosives without the use of any advanced analytical instrumentation.