The Construct And Sensing Property Research Of Fluorecescent Nanofibrous Films To Detect TNT Vapor

In this paper, for the purpose of specific, quick detection of nitroaromatic explosives(TNT as a representative), we used the electrospinning method to fabricate three kinds offluorescent nanofibrous films. And the theoretical and experimental studies using thefluorescence nanofibrous membrane on the detection of nitro aromatic explosives wereundertaken. The main research contents of this thesis are as follows:1. In order to realize the goal of the selective and rapid detection nitro-aromaticexplosives, we have designed and synthesized a novel APTS and rGO co-functionalfluorescent nanonets film in which polyvinylpyrrolidone (PVP) acts as polymer and pyreneacts as fluorescent molecule via electrospinning method. The fluorescent nanonets film showsa very good performance in detection saturated nitro-aromatic explosives vapors. It is foundthat APTS has electron-rich amino groups, the surface-bound APTS could provide receptorsites for electron-deficient TNT molecules to create highly charged complexes. Thus canenhance adsorption of nitro aromatic explosives and improve flurescent quenching efficiency.In addition, reduced graphene oxide (rGO) can form pi-pi stacking with pyrene andnitro-aromatic explosives vapors, thus can accelerate the electron transfer and rapidly detectnitro-aromatic explosives.2. In order to control nanofibrous construction and realize the goal of the rapid detectionnitro-aromatic explosives, we have designed and synthesized a novel APTS functional porousfluorescent nanofibrous film in which polystyrene (PS) acts as polymer and pyrene and acts asfluorescent molecule via electrospinning method by changing the electrospinning temperature,humidity, the amount of PS, solvent, etc.. The fluorescent nanonets film shows a very niceperformance in detection saturated nitro-aromatic explosives vapors. It is found that theporous construction can enhance the contact between pyrene and nitro-aromatic explosivesmolecules. In addition, APTS can enhance adsorption of nitro aromatic explosives vapors andimprove fluorescent quenching efficiency.3. In order to control stability of fluorescent molecules and realize the goal of the rapiddetection nitro-aromatic explosives, we have designed and synthesized a novel APTSfunctional ZnO nanowire fluorescent nanofibrous film in which polystyrene (PS) acts aspolymer and zinc acetate acts as precursors respectively via electrospinning, seed growth andhydrothermal growth method. The ZnO nanowire fluorescent nanofibrous shows a very nice stability and performance in detection saturated nitro-aromatic explosives vapors. It is foundthat the hierarchical structure can enhance the contact points of between ZnO nanowire andnitro-aromatic explosives molecules. In addition, APTS can enhance adsorption of nitroaromatic explosives vapors and improve fluorescent quenching efficiency.In conclusion, the study of fluorescence quenching method in detection of nitro-aromaticexplosives has an important theoretical meaning and a great practical value.