Method of appearing and storing latent fingerprints on basis of semiconductor polymer quantum dots

Abstract

The invention discloses a method of appearing and storing latent fingerprints on basis of semiconductor polymer quantum dots. The method includes: using fluorescent polymer quantum dots as a fluorescent marker to combine with organic material of a latent fingerprint left on an object, through electrostatic adhesion or hydrophilic and hydrophobic action or Van der Waals force; allowing curing under the photo-initiation condition to form a stable covalent bond three-dimensional network structure, and allowing permanent storage due to the cross-linked polymer quantum dots being not soluble or meltable and stable in physical and chemical properties; and through ultraviolet excitation, allowing the structure to contrast with a base in color so as to appear a fluorescent pattern which can clearly indicate fingerprint lines. The method is simple, fast, accurate, lossless, stable and nontoxic and environment-friendly; high sensitivity of latent fingerprint appearing is retained, the problem that exhibits are difficult to store for a long time during actual application is solved, and the method is widely applicable to the fields such as fingerprint detection, long-term lossless storage, and anti-faking.

Description

technical field

[0001] The invention belongs to the technical fields of nano-luminescent material technology and fingerprint detection, and in particular relates to a method for displaying latent fingerprints based on semiconductor polymer quantum dots and enabling them to be preserved for a long time without damage. Background technique

[0002] Fingerprints are the lines formed by the bumpy skin on the pads of primate fingers. It can also refer to the mirror imprint of the finger skin papillae line pattern left on the surface of the object due to the interaction of sweat and oil with the surface of the object when these lines are touched. This imprint, usually cannot be directly observed by the eyes, needs to be developed to display its original image, so it is called a latent fingerprint. Fingerprints have a very special physiological structure: first, the fingerprints of any person in ancient and modern China and abroad are purely unique and vary from person to person; ...

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