Advances in the Application of Organic Materials for the Development of Latent Fingerprints

Abstract

Fingerprint can directly identify the person, and it is one of the most important physical evidence in the criminal scene. Fingerprint has always been considered as the "head of physical evidence" and plays an important role in the investigation and court proceedings. However, the fingerprint on the relevant object can not be directly observed by human eyes in actual cases, so it is also called "latent fingerprint". Although the latent fingerprint development technology has made great progress, it still faces many difficulties in the aspects of nondestructive, sensitive and efficient. And, it will bring serious difficulties to the subsequent fingerprint identification work for the criminal technicians. Therefore, it is of great significance to develop highly selective, sensitive and convenient latent fingerprint developing materials or techniques. In view of this, on the basis of the research achievements at home and abroad, the application of traditional organic materials widely used in latent fingerprint development and the new fluorescent organic materials is briefly reviewed, such as aggregation induced emission materials, conjugated polymer materials and other organic fluorescent materials, in latent fingerprint development in recent ten years. The design concept of related organic materials and the mechanism of developing latent fingerprints are summarized. Finally, the existing problems are discussed, and the future development trend of organic materials in developing

A difluoroboron compound with latent fingerprint detection and inkless writing based on aggregation-induced emission enhancement and mechanofluorochromic behavior

“…The formed nano-aggregates were adsorbed on LFPs through hydrophobic-hydrophobic adsorption, and then fluorescence imaging of LFPs was observed under a UV lamp; in other words, hydrophobicity was a major yardstick for the fingerprinting development mechanism. [20][21][22] To overcome the toxicity, high-cost, and scarcity of conventional fingerprint powders, AIEactive compounds for LFP detection were promising substitutes. 23 Pyridine with a six-membered N-heterocyclic structure was usually considered as a good ligand due to strong coordination nature stemming from the pyridine nitrogen.…”