Method for manifesting latent fingerprints on basis of fluorescent gold nanoclusters

Abstract

The invention provides a method for manifesting latent fingerprints on the basis of fluorescent gold nanoclusters, belonging to the field of nano materials. A glutathione solution is taken to be mixed with chloroauric acid solution; a gold nanocluster solution with a fluorescent characteristic, which is used for functionalizing glutathione, is dripped on the surfaces of sweat and blood latent fingerprints to serve as a manifestation material to manifest the sweat and blood latent fingerprints; gold nanocluster particles are absorbed in fingerprint ridgelines; and under the irradiation of an ultraviolet light source, the gold nanocluster particles emit orange fluorescent light, so that the fingerprint ridgelines can be clearly contrasted and distinguished and the aim of manifesting the latent fingerprints by using the fluorescent light is achieved. The method provided by the invention has the advantages of simplicity, sensitivity and no toxicity, the latent fingerprints can be manifested without influencing DNA (deoxyribonucleic acid) components of blood, and the research and application range of manifesting the latent fingerprints by using a fluorescent probe is widened.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a method for displaying latent fingerprints using gold nanoclusters with fluorescent properties. [0002] Background technique [0002] Fingerprint identification is one of the most reliable methods for personal identification. Fingerprints play an important role in evidence in forensic science and criminal proceedings. In the history of forensic science, fingerprints are known as the king of evidence. At present, the methods used in on-site fingerprint display mainly include: optical display method, physical display method and chemical display method. The common weakness of these methods is low sensitivity, some of which interfere with the sensitivity and results of DNA testing after application. The most widely used method is the powder method, but the damage to the professional and technical personnel is greater, and the Achilles heel of this method is that it...

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Problems solved by technology

At present, there are no reports on the use of it to identify and detect other human remains and crime scene investigations.

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