Unambiguous detection of nitrated explosive vapours by fluorescence quenching of dendrimer films.
Unambiguous detection of nitrated explosive vapours by fluorescence quenching of dendrimer films.
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DOI：
10.1038/ncomms9240
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发表时间：
2015-09-15
影响因子：
16.6
通讯作者：
Shaw PE
中科院分区：
文献类型：
--
作者：
Geng Y;Ali MA;Clulow AJ;Fan S;Burn PL;Gentle IR;Meredith P;Shaw PE
对含硝基爆炸物和示踪剂进行非环境性和选择性远距离（非接触）现场检测是一个重要目标，但难以用标准分析技术实现。氧化荧光猝灭法是一种高灵敏度的检测此类物质的方法，但它容易出现假阳性，日常用品如香水也会引起类似的反应。在这里，我们报告薄膜的发光树枝状聚合物，检测蒸汽的爆炸物和标记物选择性荧光淬灭没有观察到一系列常见的干扰。使用中子反射计，石英晶体微量天平和微物理测量的组合，我们表明，选择性的起源主要是电子的，而不是分析物的扩散动力学或其在膜中的分布。这些结果是开发用于硝基爆炸性蒸气的远距离检测的传感材料的重大进展，并对控制传感功效的物理过程提供了重要的见解。 由于挥发性干扰物的存在，爆炸物的选择性间隔检测是具有挑战性的。在这里，作者报告了树枝状聚合物薄膜，当暴露于爆炸物而不是常见的干扰物时，显示出不同的荧光反应，从而可以选择性地检测硝化爆炸物。
Unambiguous and selective standoff (non-contact) infield detection of nitro-containing explosives and taggants is an important goal but difficult to achieve with standard analytical techniques. Oxidative fluorescence quenching is emerging as a high sensitivity method for detecting such materials but is prone to false positives—everyday items such as perfumes elicit similar responses. Here we report thin films of light-emitting dendrimers that detect vapours of explosives and taggants selectively—fluorescence quenching is not observed for a range of common interferents. Using a combination of neutron reflectometry, quartz crystal microbalance and photophysical measurements we show that the origin of the selectivity is primarily electronic and not the diffusion kinetics of the analyte or its distribution in the film. The results are a major advance in the development of sensing materials for the standoff detection of nitro-based explosive vapours, and deliver significant insights into the physical processes that govern the sensing efficacy. Selective standoff detection of explosives is challenging due to the presence of volatile interferents. Here, the authors report dendrimer thin films that display distinct fluorescence responses when exposed to explosives as opposed to common interferents, allowing selective detection of nitrated explosives.