Method for developing fingerprint on skin by using Fe3O4/SiO2@Gd2O3:Eu,Bi materials

A fingerprint and skin technology, applied in the field of fingerprint detection, can solve the problems of unclear lines and low success rate of fingerprints, and achieve the effect of clear outline, clear fingerprint texture and stable properties

Inactive Publication Date: 2012-10-24
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of low success rate and unclear texture of fingerprints on the skin in the prior art, and provides a method using Fe 3 o 4 / SiO 2 Gd 2 o 3 : Eu,Bi Magnetic-Fluorescent Nanomaterials Appearing Fingerprints on Skin

Method used

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  • Method for developing fingerprint on skin by using Fe3O4/SiO2@Gd2O3:Eu,Bi materials
  • Method for developing fingerprint on skin by using Fe3O4/SiO2@Gd2O3:Eu,Bi materials

Examples

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Embodiment 1

[0022] This example utilizes Fe 3 o 4 / SiO 2 Gd 2 o 3 : Eu, the method for Bi magnetic-fluorescent nanomaterials to show fingerprints on the skin comprises the following steps:

[0023] Step 1: Fingerprint Transfer

[0024] Press the transparent glass sheet on the human skin with fingerprints left, the glass sheet is in full contact with the skin for 3-5 seconds, transfer the fingerprints on the skin to the glass sheet, and remove the glass sheet;

[0025] Step 2: Utilize Fe 3 o 4 / SiO 2 Gd 2 o 3 :Eu,Bi Magnetic-Fluorescent Nanomaterials Show Fingerprints

[0026] Place the glass sheet with fingerprints on the table, stick the four corners with tape, and touch the Fe with the tip of the fingerprint brush. 3 o 4 / SiO 2 Gd 2 o 3 : Eu, Bi magnetic-fluorescent nanomaterials, use the thumb and forefinger to turn the brush handle 3 times to make the tip of the fingerprint brush adhere to an appropriate amount of powder, lift the fingerprint brush slightly, and then tu...

Embodiment 2

[0033] The utilization of Fe in the above-mentioned Example 1 3 o 4 / SiO 2 Gd 2 o 3 : In the method for Eu, Bi magnetic-fluorescent nanomaterials to reveal fingerprints on the skin, Fe in step 2 3 o 4 / SiO 2 Gd 2 o 3 :Eu, Bi magnetic-fluorescent nanomaterials are prepared by the following steps:

[0034] Step a: Take 61.5mL of deionized water and add it to a 150mL three-neck flask, stir with argon to remove oxygen for 30 minutes, and weigh 1.80g of FeCl 3 ·6H 2 O with 3.24g FeSO 4 ·7H 2 O was added to the three-necked flask according to the molar ratio of 1:1.8, mechanically stirred, the stirring speed was 500 rpm, and the dissolution was accelerated to obtain a solution with a solid-to-liquid ratio of 0.082g / mL, heated to 60°C, and 6mL of concentrated ammonia water was added, Regulate the pH of solution to be 9, other operation of this step is identical with embodiment 1, obtains Fe 3 o 4 magnetic nanoparticles;

[0035] Step b: Weigh 0.174g Fe in step a 3 o ...

Embodiment 3

[0040] The utilization of Fe in the above-mentioned Example 1 3 o 4 / SiO 2 Gd 2 o 3 : In the method for Eu, Bi magnetic-fluorescent nanomaterials to reveal fingerprints on the skin, Fe in step 2 3 o 4 / SiO 2 Gd 2 o 3 :Eu, Bi magnetic-fluorescent nanomaterials are prepared by the following steps:

[0041] Step a: Take 59mL of deionized water and add it to a 150mL three-neck flask, stir with argon to remove oxygen for 30 minutes, and weigh 1.62g of FeCl 3 ·6H 2 O with 3.24g FeSO4 7H 2 O was added to the three-necked flask according to the mass ratio of 1:2, mechanically stirred, the stirring speed was 500 rpm, and the dissolution was accelerated to obtain a solution with a solid-to-liquid ratio of 0.082g / mL, heated to 60°C, and 9mL of concentrated ammonia water was added, Regulating the pH of solution is 10, and other operation of this step is identical with embodiment 1, obtains Fe 3 o 4 magnetic nanoparticles;

[0042] Step b: Weigh 0.174g Fe in step a 3 o 4 Th...

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Abstract

The invention provides a method for developing fingerprint on skin by using Fe3O4/SiO2@Gd2O3:Eu,Bi materials. The method comprises the following steps: utilizing both good magnetism and strong fluorescence properties of Fe3O4/SiO2@Gd2O3:Eu,Bi magnetic-fluorescence nano materials of a core-shell structure, brushing on a fingerprint which is transferred on the surface of a glass sheet, by a fingerprint brush tip, combining the fingerprint, and developing the fingerprint texture under irradiation of ultraviolet light. The method can be used for overcoming the defect that the magnetic powder method has low sensitivity of developing the fingerprint on the skin, improves the developing success rate of the fingerprint on the skin, is clear for the developed fingerprint on the skin, obvious for contours; and the developing method is simple, and easy to implement, and the Fe3O4/SiO2@Gd2O3:Eu,Bi magnetic-fluorescence nano materials have stable properties, are easy to store, consumes less, and can be used for greatly improving the developing efficiency of the fingerprint on the skin.

Description

technical field [0001] The invention belongs to the technical field of fingerprint detection, and in particular relates to a display method for displaying fingerprints on various substrates including skin and wall bricks. Background technique [0002] Fingerprints are the unique form of human skin lines. It is a typical hereditary trait, which varies from person to person and remains unchanged throughout life. In criminal science and technology, fingerprint identification is an important means for personal identification, and fingerprints were once considered the "first evidence". In recent years, with the development of DNA technology, DNA technology is often used as an important means of identification of physical evidence in judicial appraisal. In some cases, there are many cases where DNA test reports are used as the only basis for judgment. Some people even think that DNA technology can replace fingerprint technology in the identification of physical evidence. In the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64A61B5/117A61B5/1172
Inventor 吕家根刘娜鲁芳朱依娜聂迎春汪永丽
Owner SHAANXI NORMAL UNIV
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