摘要
硝基芳烃类爆炸物危害生命,污染环境。因此高效快速检测出微痕量硝基芳烃类爆炸物,对人们的生命财产安全至关重要。本文通过静电纺丝技术制备了具有双层结构的多孔纳米纤维薄膜传感器(P-PS/GLE)。首先,在玻璃片表面制备多孔骨架的富有氨基和羟基的明胶纺丝膜(GLE)。然后,在明胶纺丝膜上覆盖一层含荧光聚合物P的静电纺丝纳米纤维薄膜(P-PS)。在传感器中,明胶纤维膜作为支撑材料附在玻璃片上,有利于硝基芳烃分子同时从P-PS薄膜上边或下边进入与荧光聚合物P接触,提高猝灭效率。且明胶中含有大量氨基和羟基等富电子基团,缺电子硝基芳烃与明胶之间氢键相互作用,使得硝基芳烃富集在传感器表面,利于其检测。置于饱和DNT蒸汽中,双层薄膜传感器比单层P-PS膜传感器具有更高的猝灭效率。
Nitro aromatic compounds(NACs) have attracted increasing attention for protection against threat of terrorism at entrance portals and other domestic situations. So, the detection of NACs at ultra low level has become an urgent issue. In this work, A novel sensor with double-layer structural characteristics was prepared by electrospinning technique. The top layer(P-PS) was the nanofibrous membrane of the conjugated polymer P doped in polystyrene(PS), serving as the main sensor material to detect NACs. The bottom layer(GEL) was the gelatin nanofibrous membrane which served as porous substrate for the top layer. Within the double-layer structure, the porous GEL layer allowed the NACs molecules to transfer through the P-PS layer from both sides, thus greatly improved the permeability of the P-PS layer. Therefore, the double-layer membrane sensor exhibited a greater quenching efficiency(Q_f) of 75 % than that of the single-layer of P-PS(55 %).
引文
[1]Yuanyuan Long,Haibo Chen,Huaming Wang,etc.Analytica Chimica Acta 2012,744:82.