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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Quantitative real time sensing reveals enhanced sensitivity of polar dendrimer thin films for plastic explosive taggants
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Quantitative real time sensing reveals enhanced sensitivity of polar dendrimer thin films for plastic explosive taggants

机译:实时定量检测揭示极性树状聚合物薄膜对塑料爆炸性标签剂的敏感性提高

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A method of introducing pulses of analyte vapours has been developed to study the interactions of nitro-containing analytes with fluorescent sensing films. The quenching of the photoluminescence of thin dendrimer films by exposure to sub-saturation concentration vapour pulses of nitro- containing analytes is quantified and the reversibility of quenching interactions qualitatively examined. The analysis reveals a linear dependence of the initial/quenched fluorescence ratio (F-0/F) with quencher concentration akin to Stern-Volmer behaviour routinely used to quantify quenching efficiency in solution. Detection limits and quenching efficiencies were calculated in the sub-saturation regime for each of the analytes and trace-level detection of 1,4-dinitrobenzene, 2,4-dinitrotoluene, 4-nitrotoluene, and nitromethane vapours was observed. It was found that the sensitivity of first generation bifluorene- and carbazole-cored dendrimers towards vapours of the nitroaliphatic taggant 2,3-dimethyl-2,3-dinitrobutane was significantly enhanced by changing the solubilising chains on the core from alkyl to oligo(ethylene oxide) groups. The responses of the films were observed to be independent of film exposure history making these dendrimers interesting candidates for deployment in thin film vapour sensors for explosives.
机译:已经开发了一种引入分析物蒸气脉冲的方法,以研究含硝基分析物与荧光传感膜之间的相互作用。通过暴露于含硝基分析物的亚饱和浓度蒸汽脉冲来猝灭树枝状大分子薄膜的光致发光,并定量研究了猝灭相互作用的可逆性。分析揭示了初始/猝灭荧光比(F-0 / F)与淬灭剂浓度的线性相关性,类似于通常用于量化溶液淬灭效率的Stern-Volmer行为。在亚饱和状态下计算每种分析物的检出限和猝灭效率,并观察到痕量水平的1,4-二硝基苯,2,4-二硝基甲苯,4-硝基甲苯和硝基甲烷蒸气。发现通过将核心上的增溶链从烷基改为低聚(乙烯),可以显着提高第一代以芴基和咔唑为核心的树状大分子对硝基脂肪族标记剂2,3-二甲基-2,3-二硝基丁烷蒸气的敏感性。氧化物)基团。观察到膜的响应与膜的暴露历史无关,这使得这些树枝状聚合物成为用于炸药的薄膜蒸气传感器中的有趣候选。

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