摘要
由于广泛的实用性以及潜在的应用价值,设计和制备荧光化学传感器已经吸引了越来越多研究者的兴趣。一些特殊的荧光化学传感器可以用于对TNT, DNT等爆炸剂进行检测,这对军事战争,工业生产以及日常生活安全等是十分重要的。聚对苯乙炔(PPV)及其衍生物的结构中具有大量的共轭π键,受激发后电子跃迁很容易产生荧光发射。本文采用垂直脉冲激光沉积(VPLD)法,在常温常压下制备了高荧光强度的改性PPV薄膜,并且利用激光诱导转移技术(LIFT)制备了纳米PPV薄膜。薄膜的形貌,结构和化学组成通过SEM、FTIR、XPS以及荧光光谱进行表征。SEM分析表明激光刻蚀改性的PPV薄膜在一定的制备条件下薄膜表面平整,没有破坏；通过LIFT方法制备的纳米结构的薄膜表面呈现纳米网状结构,纳米线直径在25-30nm左右。FTIR、XPS光谱测试表明激光刻蚀改性薄膜的组成发生了变化,共轭结构增多,相应的导致荧光光谱发生红移。而由于纳米量子尺寸效应占主导地位,LIFT法制备的纳米PPV薄膜的荧光光谱发生蓝移。分别将两种薄膜对淬灭剂苦味酸,TNT进行淬灭响应实验发现,两种薄膜对淬灭剂的响应程度均较未经处理的PPV薄膜大,响应时间更短。
The design and fabrication of fluorescence chemical sensors had attracted more and more interests of researchers for their widely practical and potential applications. Some special fluorescent chemical sensor could be used to detect TNT, DNT and other explosive agent which is very important for military wars, industrial production, daily life safety and so on. Poly(p-phenylenevinylene)(PPV)and its derivative, which have large quantity of the conjugatedπstructures, are very easy to produce fluorescence after being excited.Vertical pulse laser was used to prepare higher fluorescence modified PPV film at ambient temperature and atmospheric pressure. The Laser-induced forward transfer(LIFT)technique had been used to produce nano-PPV film. The morphology, structure and chemical composition of the films were characterized by the SEM, FTIR, XPS and PL spectra. SEM analysis showed that the surface of the modified PPV film by the VPLD was roughness and there was no damage under certain condition; SME images of the nano-PPV film by the LIFT presented nano-network structure and the diameter of the nanowire from approximately 25nm to 30nm. FTIR、XPS spectra showed that the composition of the modified PPV film by the laser etching had changed and the conjugated structure of the film had been increased, the fluorescence spectra had been happened the red shift. The PL spectra of nano-PPV film which was prepared by the LIFT had been happened blue shift because of the quantum size effect of nanostructure. The two kinds of PPV films contacted with the TNP, TNT respond to the quenching experiment, respectively. We found that the two kinds of films all had been quenched much more than the plain film and the extent of the quenching even much bigger than the unmodified PPV film within the shorter time.
引文
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