Preparation of fluorescer for visualizing latent fingermark on viscous surface of adhesive tape

A fluorescent agent and sticky surface technology, which is applied in the field of fluorescent agent preparation, can solve the problem of lack of display effect of nano-type and non-nano-type display reagents, clarity of lines and details, poor selective combination with fingerprint residues, etc. problems, to achieve the effect of being suitable for mass production, improving sensitivity and accuracy, and being easy to popularize

Inactive Publication Date: 2009-05-27
CHINESE PEOPLE'S PUBLIC SECURITY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Their shortcomings are that the fluorescence performance (fluorescence intensity, fluorescence lifetime, anti-bleaching ability, Stokes shift, etc.) sometimes cannot meet the requirements of old fingerprints, poor selective binding ability with fingerprint residues, strong toxicity
[0006] However, there are still some problems that need to be further solved in the field of potential fingerprint applications of this kind of materials: for example, the preparation cost of some new-type visualization reagents is high, the operation is complicated, the stability of the reagent is lacking, the selective combination with fingerprint residues is poor, and the clarity of the lines And details are easily covered up; in addition, for the latent fingerprints on the tape sticky surface that are more common in crime scenes, the existing nano-type and non-nano-type visualization reagents have insufficient visualization effects

Method used

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  • Preparation of fluorescer for visualizing latent fingermark on viscous surface of adhesive tape
  • Preparation of fluorescer for visualizing latent fingermark on viscous surface of adhesive tape

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Add 1mL of distilled water and 0.15g of sodium sulfite to the first glass container respectively, put 0.04g of selenium powder in it, and pass into nitrogen for 20min to carry out deoxidation, and heat and reflux in a water bath for 60min until the selenium powder is completely dissolved to obtain an aqueous solution of sodium selenosulfite ;

[0023] (2) Add 60mL of deionized water to the second glass container, and carry out deoxidation treatment with nitrogen gas for 30min, then add 0.04g of cadmium chloride to dissolve it completely, then add mercaptoacetic acid of 5 times molar concentration, and use The concentration is 1mol L -1 The pH of the NaOH aqueous solution was adjusted to be 8, and after continuing to feed nitrogen for 40min, an aqueous sodium selenosulfite solution was added, and refluxed in boiling water for 2h to obtain a cadmium selenide nanocrystal solution;

[0024] (3) Add 60 mL of deionized water to the third glass container, pass nitrogen ga...

Embodiment 2

[0026] (1) Add 1 mL of distilled water and 0.1 g of sodium sulfite to the first glass container respectively, place 0.02 g of selenium powder in it, and feed nitrogen gas for 30 min to deoxidize, heat and reflux in a water bath for 30 min until the selenium powder is completely dissolved to obtain an aqueous solution of sodium selenosulfite ;

[0027] (2) Add 40mL of deionized water to the second glass container, and pass nitrogen gas for 20min to carry out deoxidation treatment, then add 0.02g of cadmium chloride to completely dissolve it, and then add mercaptoacetic acid of 5 times molar concentration, Use a concentration of 0.5mol L -1 The pH of the NaOH aqueous solution is adjusted to be 8, and after continuing to feed nitrogen for 30min, an aqueous sodium selenosulfite solution is added, and refluxed in boiling water for 1h to obtain a cadmium selenide nanocrystal solution;

[0028] (3) Add 40 mL of deionized water to the third glass container, ventilate nitrogen for 20 ...

Embodiment 3

[0030] (1) Add 3 mL of distilled water and 0.2 g of sodium sulfite to the first glass container respectively, place 0.05 g of selenium powder in it, and feed nitrogen gas for 40 min to carry out deoxidation, and heat and reflux in a water bath for 90 min until the selenium powder is completely dissolved to obtain an aqueous solution of sodium selenosulfite ;

[0031] (2) Add 80 mL of deionized water to the second glass container, pass nitrogen gas for 40 minutes for deoxidation treatment, then add 0.05 g of cadmium chloride to completely dissolve it, and then add mercaptoethanol with a concentration of 10 times the molar concentration. 2molL -1 The pH of the NaOH aqueous solution is adjusted to be 11, and after continuing to feed nitrogen for 60 minutes, an aqueous sodium selenosulfite solution is added, and refluxed in boiling water for 3 hours to obtain a cadmium selenide nanocrystal solution;

[0032] (3) Add 80 mL of deionized water to the third glass container, pass nitr...

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Abstract

The invention relates to a method for preparing a fluorescer for showing potential fingerprint through the viscous side of adhesive tap and belongs to the field of fingerprint identification technology. The method comprises the following steps: distilled water, sodium sulfite and selenium powder are added to a first vessel and is deoxidized and is heated and reflows in a water bath to obtain a seleno sodium sulfite aqueous solution; after deionized water is added to a second vessel for deoxidization, cadmium chloride and a sulfhydryl compound are added to the vessel; the PH value of the mixture is regulated; the seleno sodium sulfite aqueous solution is added to the vessel and reflows in boiling water to obtain a cadmium selenide nanocrystal solution; after the deionized water is added to a third vessel for deoxidization, the cadmium chloride and the sulfhydryl compound are added to the vessel; the PH value of the mixture is regulated; and the obtained solution is added to the cadmium selenide nanocrystal solution, is dripped with an equimolar sodium sulfide aqueous solution and reflow in boiling water to obtain the fluorescer. The method has a simple process and available materials; and the fluorescer has perfect showing efficiency, sensitivity, accuracy and repeatability and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of fingerprint identification, and in particular relates to a method for preparing a fluorescent agent for displaying potential fingerprints on adhesive tape adhesive surfaces. The nano fluorescent material prepared by the method has strong selective binding ability to potential fingerprint residues and High fluorescence performance. Background technique [0002] Mudra is the skin pattern of human hands, including mastoid pattern (fingerprint, knuckle pattern and palm pattern), flexor folds, wrinkles and scars on the palm surface. Fingerprints can be regarded as the first evidence, which is of great significance and role in providing investigation direction and finally designating criminal suspects. At present, in many crime scenes (such as kidnapping, explosion, etc.), tapes carrying fingerprint information are left behind, so exploring new simple, efficient, accurate and safe display methods has become an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/54A61B5/117A61B5/1172
Inventor 王彦吉杨瑞琴王元凤
Owner CHINESE PEOPLE'S PUBLIC SECURITY UNIVERSITY
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