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Fingerprint detection probe based on long-afterglow nanometer material, preparation method and application thereof in potential fingerprint detection

A nanomaterial and fingerprint detection technology, applied in the field of chemical detection, can solve the problems of poor water solubility of long afterglow powder particles, large particle size of long afterglow powder, and energy consumption, and achieve good green afterglow luminescence properties, and the detection process is simple and fast. , the synthesis method is simple and easy to implement

Active Publication Date: 2017-07-18
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many defects in this method. First, the moisture in the fingerprint will be lost rapidly with the growth of the storage time, resulting in a significant reduction in the binding ability of the long afterglow powder and the fingerprint, so the long afterglow powder is not suitable for fingerprints that have been placed for a long time. detection
Second, the fingerprint is a three-dimensional porous structure. The long-lasting powder obtained by physical grinding has a large particle size and cannot enter the tiny holes in the fingerprint. Therefore, the imaging resolution of the fine structure of the fingerprint is not enough.
Third, the long-lasting powder particles obtained by physical grinding have poor water solubility and are difficult to modify the surface, so they are only suitable for the detection of fingerprints by the powder method, and cannot be used for specific chemical substances in fingerprints (such as proteins, cocaine, etc.) ) detection
Fourth, the high-temperature solid-state reaction needs to be carried out above 1000°C, which has a high risk factor and consumes energy and time

Method used

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  • Fingerprint detection probe based on long-afterglow nanometer material, preparation method and application thereof in potential fingerprint detection
  • Fingerprint detection probe based on long-afterglow nanometer material, preparation method and application thereof in potential fingerprint detection
  • Fingerprint detection probe based on long-afterglow nanometer material, preparation method and application thereof in potential fingerprint detection

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Example 1: Preparation of fingerprint detection probes based on long-lasting nanomaterials

[0026] (1) Zn 2 GeO 4 : 0.5%Mn long afterglow nano material, prepared by the following method: zinc nitrate solid is dissolved in a certain amount of water to prepare a zinc nitrate solution with a concentration of 2mol / L; the manganese nitrate solution is diluted with a certain amount of water to prepare a concentration of It is 80mmol / L manganese nitrate solution; the germanium oxide solid is dissolved in 2mol / L sodium hydroxide aqueous solution to prepare a sodium germanate solution with a concentration of 400mmol / L. Accurately measure 2mL of zinc nitrate solution, 5mL of sodium germanate solution and 0.15mL of manganese nitrate solution into a 50mL beaker with a 1mL pipette gun, add 20mL of water, and stir on a magnetic stirrer. Quickly add concentrated ammonia water with a mass fraction of 28%, adjust the pH to about 6, transfer the solution to a 100mL high-temperature hy...

Embodiment 2

[0031] Example 2: The above-mentioned long-lasting nanomaterial probe is used for latent fingerprint detection

[0032] (1) The schematic diagram of fingerprint detection imaging is as follows: image 3 shown. The long-lasting nanoprobes are dropped onto the substrate, and when the probes are specifically bound to the substances in the fingerprint, the unbound probes are washed away. Under the irradiation of ultraviolet light, the fingerprint image on the base with background fluorescence interference is blurred due to the influence of the background; after turning off the ultraviolet light, the short-lived background fluorescence disappears, and the long-lasting nanoprobes still continue to emit light. Fingerprint image, because there is no background fluorescence interference, will get a clear fingerprint image.

[0033] (2) Acquisition and detection of different substrate latent fingerprint images

[0034] Volunteers gently pressed their fingerprints on the substrate wit...

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Abstract

The invention discloses a fingerprint detection probe based on a long-afterglow nanometer material, a preparation method and an application thereof in potential fingerprint detection and belongs to the field of chemical detection. The fingerprint detection probe disclosed by the invention is prepared from a Zn2GeO4:0.5%Mn long-afterglow nanometer material which is connected with 3-aminopropyl triethoxy silane on the surface and then is connected with succinic anhydride, wherein the long-afterglow nanometer material is prepared by taking zinc nitrate, sodium germanate, manganese nitrate and strong ammonia water as raw materials via a hydrothermal method. The probe disclosed by the invention has a property of continuously illuminating after exciting a light source switch, so that the probe has the characteristic of restraining the substrate background fluorescence interference and can be used for fingerprint detection on a complex substrate. The material synthesis and the probe preparation according to the invention are simple and practicable, the detection process is simple, convenient and quick, no complex large-size instrument is required and the probe is suitable for identity authentication application, such as, criminal investigation.

Description

technical field [0001] The invention belongs to the field of chemical detection, and in particular relates to a fingerprint detection probe based on long-lasting nanomaterials, a preparation method thereof and an application in latent fingerprint detection. Background technique [0002] Fingerprints have been widely used in criminal investigation, authority control, medical diagnosis and other fields. The composition of fingerprints is very complex and may be contaminated with foreign substances, and fingerprints usually exist on various complex substrates. These factors have brought great difficulties to latent fingerprint detection. At present, latent fingerprint detection methods can be roughly attributed to instrumental methods (mass spectrometry, infrared spectroscopy, etc.) and chemical coloring methods (colorimetry and photoluminescence). The instrument method needs to rely on expensive large-scale detection instruments, and cannot realize real-time fingerprint detec...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/66A61B5/1172
CPCA61B5/1172C09K11/025C09K11/66
Inventor 袁荃王杰马覃勤
Owner WUHAN UNIV