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

A polymer, quantum dot technology, applied in human identification, diagnostic recording/measurement, medical science, etc., can solve problems such as no relevant reports, and achieve the effects of reducing background interference, fluorescence stability, and high sensitivity

Active Publication Date: 2015-09-02
南方工业技术研究院(深圳)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no relevant reports on the use of semiconducting polymer quantum dots in the detection and identification of human body residues and forensic investigation

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1: cross-linkable polymer quantum dot do-PFO shows latent fingerprint (attachment figure 1 )

[0053] 1 Synthesis of polymer do-PFO:

[0054] Take a 50mL round bottom flask and weigh 9,9-bis[3-methyl-3-(6-hexyl)methyl ether-oxetane]2,7-dibromofluorene (346.3mg, 0.5mmol) , 2,7-bis(4,4,5,5-tetramethyl-1,3-dioxo-2-boryl)-9,9-dioctylfluorene (321.3mg, 0.5mmol), tetra Butylammonium bromide (6.4mg, 0.02mmol) was dissolved in toluene (10mL), then aqueous sodium carbonate solution (6mL, 2M) was added, and nitrogen was evacuated. Then tetrakis(triphenylphosphine) palladium (10mg, 0.008mmol) was added, heated to reflux at 90°C for 48 hours, and then (4,4,5,5-tetramethyl-1,3,2-dioxaborin -2-yl)benzene (30 mg), refluxed for 5 hours, added bromobenzene (0.3 mL), continued heating for 6 hours, and stopped the reaction. Cool to room temperature, wash the reactant 3 times with ammonia water, extract 3 times with chloroform, backwash 3 times with deionized water, take the...

Embodiment 2

[0062] Embodiment 2: cross-linkable polymer quantum dot do-PF10BT shows latent fingerprint (attachment figure 2 )

[0063] Same as the steps in Example 1, the difference is that the polymer do-PFO was synthesized in step 1 of Example 1, and the polymer do-PF10BT was synthesized in Example 2: Take a 50mL round bottom flask and weigh 9,9- Bis[3-methyl-3-(6-hexyl)methyl ether-oxetane]2,7-dibromofluorene (277.0 mg, 0.4 mmol), 4,7-dibromo-2,1, 3-Benzothiadiazole (29.4mg, 0.1mmol), 2,7-bis(4,4,5,5-tetramethyl-1,3-dioxo-2-boryl)-9,9 - Dioctylfluorene (321.3mg, 0.5mmol), tetrabutylammonium bromide (6.4mg, 0.02mmol) were dissolved in toluene (10mL), then aqueous sodium carbonate solution (6mL, 2M) was added, and nitrogen was evacuated. Then tetrakis(triphenylphosphine) palladium (10mg, 0.008mmol) was added, heated to reflux at 90°C for 48 hours, and then (4,4,5,5-tetramethyl-1,3,2-dioxaborin -2-yl)benzene (30 mg), refluxed for 5 hours, added bromobenzene (0.3 mL), continued heating...

Embodiment 3

[0064] Embodiment 3: crosslinkable polymer quantum dot do-PF5DTBT shows latent fingerprint (attachment image 3 )

[0065] Same as the steps in Example 1, the difference is that the polymer do-PFO was synthesized in step 1 of Example 1, and the polymer do-PF5DTBT was synthesized in Example 2: Take a 50mL round bottom flask and weigh 9,9- Bis[3-methyl-3-(6-hexyl)methyl ether-oxetane]2,7-dibromofluorene (311.7 mg, 0.45 mmol), 4,7-bis(2-bromo-5 -thienyl)-2,1,3-benzothiadiazole (22.9 mg, 0.05 mmol), 2,7-bis(4,4,5,5-tetramethyl-1,3-dioxo-2 -boryl)-9,9-dioctylfluorene (321.3mg, 0.5mmol), tetrabutylammonium bromide (6.4mg, 0.02mmol) was dissolved in toluene (10mL), then aqueous sodium carbonate (6mL, 2M), vacuumize and pass nitrogen. Then tetrakis(triphenylphosphine) palladium (10mg, 0.008mmol) was added, heated to reflux at 90°C for 48 hours, and then (4,4,5,5-tetramethyl-1,3,2-dioxaborin -2-yl)benzene (30 mg), refluxed for 5 hours, added bromobenzene (0.3 mL), continued heating...

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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; ...

Claims

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Application Information

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IPC IPC(8): A61B5/117
CPCA61B5/1172
Inventor 吴长锋陈昊彬秦伟平尹升燕
Owner 南方工业技术研究院(深圳)
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