氨基功能化聚对亚苯基亚乙烯在指纹显现中的应用OA

The study aimed to explore new methods for revealing latent fingerprints by using amino-functionalized poly(p-phenylene vinylene)fluorescent nanoparticles(PPV-brPEI NPs)as the research object.The results showed that the drop method using PPV-brPEI NPs yields the clearest fingerprints,and the number of consecutive fingerprint impressions(1-5 times),the force applied(0.2-0.7 N),and the age of the fingerprint(1-12 d)have little effect on the revelation effect.PPV-brPEI NPs can clearly reveal the morphological and detailed features of fingerprints on several difficult substrates such as coins,rough phone cases,and tape surfaces.Compared with traditional powder methods and 502 fuming methods,this method has advantages in eliminating the interference of uneven surfaces,complex patterns,and adhesion on fingerprint revelation.However,PPV-brPEI NPs have an inhibitory effect on DNA detection.All together suggested that PPV-brPEI NPs have certain advantages in revealing oily latent fingerprints,especially on difficult substrates such as rough and complex backgrounds and sticky surfaces,with good revelation effects.It can provide a solution to the problem of fingerprint revelation on difficult substrates.At the same time,the inhibitory effect of this reagent on DNA detection also suggested subsequent reagent improvement in the future.