Method for preparing semiconductor quantum dot fluorescent reagent for imprint display and extraction

Abstract

The invention discloses a novel liquid semiconductor quantum dot fluorescent reagent, the surface of which has positive electricity property, for imprint display and extraction in the criminal investigation field. The liquid semiconductor CdTe/NH3+ quantum dot fluorescent reagent, the surface of which has positive electricity property, is prepared by surface modification of a traditional II-VI semiconductor CdTe quantum dot with a surface modified by mercaptoacetic acid through hydrazine hydrate. The fluorescent reagent solves the key technical problem of mutual repulsion and low affinity of the traditional mercaptoacetic acid modified semiconductor CdTe/COO- quantum dot fluorescent reagent under the alkali condition because the surface charge property is the same as the imprint residue charge property, so the fluorescent reagent has application advantages in the criminal science field. The liquid semiconductor quantum dot fluorescent reagent has the advantages of high fluorescence intensity, simple preparation process and good adhesion with fresh or old imprint, and is suitable for display and extraction of imprints on most impervious objects in criminal investigation.

Description

Technical field [0001] The present invention relates to a novel, high-efficiency preparation method of semiconductor quantum dot fluorescent reagents for the visualization and extraction of liquid imprints, in particular to a water-soluble semiconductor CdTe quantum dot as the core, and the surface is jointly modified and modified by thioglycolic acid and hydrazine hydrate A method for preparing a semiconductor quantum dot fluorescent reagent for the development and extraction of highly efficient liquid imprints with positive charge characteristics. The novel semiconductor quantum dot fluorescent reagent for imprint visualization and extraction can be applied to the visualization and extraction of potential imprints such as fingerprints at criminal scenes. Background technique [0002] The detection of criminal cases depends to a certain extent on the extraction and collection of trace evidence at the crime scene, which is of inestimable value in the identification of crimin...

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Problems solved by technology

[0007] This patent aims at the current problem of lack of fluorescent reagents for the appearance of liquid imprints and extractions in the field of criminal science. Through special surface modification of II-VI semiconductor CdTe quantum dots, the surface is modified with thioglycolic acid and hydrazine hydrate, and With positive charge characteristics, a new type of high-efficiency imprint display and extraction semiconductor quantum dot fluorescence reagent is made

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