A developer and its preparation method and a fingerprint display method

A developer and fingerprint technology, applied in chemical instruments and methods, medical science, diagnosis, etc., to achieve the effects of low production cost, simple operation, and simple preparation process

Active Publication Date: 2019-11-05
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires two steps, and when the particle size of the up-conversion fluorescent material is large, it cannot be well dispersed in the polymer

Method used

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  • A developer and its preparation method and a fingerprint display method
  • A developer and its preparation method and a fingerprint display method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 0.5g of the up-conversion fluorescent material. In this embodiment, the up-conversion fluorescent material uses up-conversion fluorescent particles, and the up-conversion fluorescent material is NaYF 4 :Yb 3+ ,Er 3+ , YF 3 :Yb 3+ ,Er 3+ 、NaYF 4 :Yb 3+ ,Tm 3+ , YF 3 :Yb 3+ ,Tm 3+ 、NaYF 4 :Yb 3+ ,Ho 3+ or YF 3 :Yb 3+ ,Ho 3+ At least one of them, in this embodiment, the up-converting fluorescent particles are NaYF 4 :Yb 3+ ,Er 3+ , the particle size of the up-converting fluorescent particles is 0.1-5 μm, and the plasma treatment is carried out under normal pressure for 30 s, and the plasma treatment can be performed by using at least one gas in air, argon, nitrogen or helium for discharge treatment, The plasma processing power is 250W. Take the plasma-treated up-conversion fluorescent material and mix it with 20mL fumigant / inorganic alkali mixed solution, stir at a speed of 3000rpm / min for 5min, and disperse evenly to obtain a developer, wherein th...

Embodiment 2

[0032] Weigh 1.0 g of up-conversion fluorescent material. In this embodiment, the up-conversion fluorescent material uses up-conversion fluorescent particles, and the up-conversion fluorescent particles are YF 3 :Yb 3+ ,Er 3+, the particle size of the up-conversion fluorescent particles is 0.1-5 μm, and the plasma treatment is carried out under normal pressure for 60 s, and the plasma treatment can be performed by discharging at least one gas in air, argon, nitrogen or helium, The plasma processing power is 100W. Take the plasma-treated up-conversion fluorescent material and mix it with 20mL fumigant / inorganic alkali mixed solution, stir at a speed of 5000rpm / min for 5min, and disperse evenly to obtain a developer, wherein the fumigant used contains α-cyanoacrylic acid A mixture of ester compound glue and potassium hydroxide solution, and the concentration of KOH in the fumigant / KOH mixed solution is 10 mg / mL.

[0033] Take the prepared developer and spray it vertically ont...

Embodiment 3

[0035] Weigh 0.5g of the up-conversion fluorescent material. In this embodiment, the up-conversion fluorescent material uses up-conversion fluorescent particles, and the up-conversion fluorescent particles are NaYF 4 :Yb 3+ ,Tm 3+ , the particle size of the up-conversion fluorescent particles is 0.1-5 μm, and the plasma treatment is carried out under normal pressure for 5 s, and the plasma treatment can be performed by using at least one gas in air, argon, nitrogen or helium for discharge treatment, The plasma processing power is 500W. Take the plasma-treated up-conversion fluorescent material and mix it with 20mL fumigant / inorganic alkali mixed solution, stir at a speed of 5000rpm / min for 5min, and disperse evenly to obtain a developer, wherein the fumigant used contains α-cyanoacrylic acid The mixture of the glue of ester compound and sodium carbonate solution, the concentration of sodium carbonate in the described fumigant / sodium carbonate mixed solution is 20mg / mL.

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Abstract

The invention relates to a developer and a preparation method thereof and a fingerprint displaying method. The preparation method of the developer is characterized in that an up-conversion fluorescentmaterial is processed by plasma, then is mixed with a fuming agent, and a mixture is uniformly dispersed to obtain the product. The preparation method of the developer is simple, the developer is directly applied on a to-be-detected fingerprint, the fingerprint can be displayed under infrared light irradiation and can be displayed with one step, and compared with the current fingerprint displaying methods, the method provided by the invention is faster in speed, simpler in operation, and lower in production cost; the developer has stronger absorption affinity to residues on the surface of thefingerprint, can effectively solve the background interference problem, and can reach good fingerprint displaying effect.

Description

technical field [0001] The invention relates to the technical field of fingerprint detection, in particular to a developer, a preparation method thereof and a fingerprint display method. Background technique [0002] Fingerprints, especially the visualization of latent fingerprints, play a very important role in criminal investigations. However, the potential fingerprint objects appearing at the crime scene are often characterized by diversity and complexity, and fluorescent materials are often needed to help the fingerprints appear. There are mainly the following methods for fluorescent materials to be applied to fingerprint display: powder display method, 502 glue fumigation display method, among which powder display method is the most commonly used method in the process of on-site investigation by public security agencies in various places. This method has the advantages of simple operation, It can be called a classic method in fingerprint display technology due to its r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/85A61B5/1172
Inventor 谢寒寒高明喻学锋
Owner SHENZHEN INST OF ADVANCED TECH
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