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Composite membrane for latent fingerprint transfer or developing or content integrated full-dry state detection and detection method

A detection method and a composite membrane technology, applied in the detection field, can solve problems such as insensitivity, cumbersome operation, light color development, etc., and achieve the effects of favorable preservation, realization of transfer, and low adsorption force

Inactive Publication Date: 2017-11-07
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some defects in these methods, such as damaged lines, unclear display, insensitivity, or high development cost, cumbersome operation, light color rendering, and easy to be disturbed by background color. The substrate of the fingerprint is treated with a chemical solution, so it is not suitable for many specific substrates such as water-sensitive surfaces

Method used

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  • Composite membrane for latent fingerprint transfer or developing or content integrated full-dry state detection and detection method
  • Composite membrane for latent fingerprint transfer or developing or content integrated full-dry state detection and detection method
  • Composite membrane for latent fingerprint transfer or developing or content integrated full-dry state detection and detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1, Preparation of AgNPs@PDA@PDMS Composite Membrane

[0044] The preparation method of AgNPs@PDA@PDMS composite membrane, the synthetic route is as follows figure 1 As shown in a:

[0045] Wherein, method one step is as follows:

[0046] (1) Synthesis of polydimethylsiloxane (PDMS) membrane: Weigh 3g of PDMS prepolymer and 0.3g of hardener (Sylgard 184, Dow Corning) in a plastic petri dish with a diameter of 9cm, mix well, and then vacuumize Make the air bubbles in the mixture float to the surface and burst, and then place it on a heating platform at 60-100°C for 2-4 hours to obtain PDMS films with different hardness;

[0047] (2) Synthesis of polydopamine@polydimethylsiloxane (PDA@PDMS) membrane: take 15ml Tris-HCl (50mM, pH=8.5) buffer solution, put it in a clean beaker, add 30mg dopamine hydrochloride, 30mg over Ammonium sulfate, stirred for 1min, poured into a petri dish with PDMS membrane, reacted at room temperature (18-25°C) for 5min-2h, rinsed with wate...

Embodiment 2

[0053] Example 2. Development and imaging of latent fingerprints using AgNPs@PDA@PDMS composite film

[0054] Using AgNPs@PDA@PDMS composite film latent fingerprint development and imaging process as follows figure 1 As shown in b, the specific steps are as follows:

[0055] A. Latent fingerprint treatment: drop 5 μl of different concentrations of rhodamine 6G (Rhodamine6g, R6g), p-aminothiophenol (4-Aminothiophenol, 4-ATP), methyl blue (methyl blue) or For thiabendazole solution, let it stand for 10 minutes to volatilize the solution, press fingerprints on the carrier material, leave it in the air for 1-3 days, or heat it at 60°C for 15-60 minutes, or blow it with an electric hair dryer for 5 minutes.

[0056] B. Gently attach the AgNPs@PDA@PDMS composite film to the fingerprint carrier material, and separate after standing for 5 minutes, and obtain the latent fingerprint patterns visible to the naked eye on the original substrate and PDMS respectively;

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Abstract

The invention relates to a composite membrane for latent fingerprint transfer or developing or content integrated full-dry state detection and a detection method. The composite membrane is formed by sequentially compositing a nano-silver layer, a polydopamine layer and a dimethyl silicone polymer layer from top to bottom, when the composite membrane fits fingerprints, interface separation of the nano-silver@polydopamine composite structure can be achieved, and the composite membrane can be used for latent fingerprint transfer or developing or content integrated full-dry state detection. The invention further discloses a detection method for latent fingerprint transfer or developing or content integrated full-dry state detection. The composite membrane is used for latent fingerprint transfer, the plasma resonance effect of nano-silver particles is utilized, and latent fingerprints appear to be brown; by means of the raman enhancing effect of the nano-silver particles, detection of an allothigene in latent fingerprints is achieved, so that the method can achieve latent fingerprint transfer or developing or content integrated full-dry state detection, and the decisive function is achieved in judicial investigation.

Description

technical field [0001] The invention belongs to the technical field of detection, and relates to a composite film used for latent fingerprint transfer, development or inclusion integrated full-dry state detection, and also relates to a latent fingerprint transfer, development and inclusion integrated full-dry state detection method . Background technique [0002] Fingerprints are mainly divided into three categories: plastic fingerprints, visible fingerprints and latent fingerprints. Among them, latent fingerprints are not easy to find with the naked eye, but they play a pivotal role in judicial investigations. At present, latent fingerprint display methods are mainly divided into physical display methods such as optical method and powder method; chemical display methods such as ninhydrin method, iodine fumigation method, silver nitrate method, metal deposition method, etc. However, there are some defects in these methods, such as damaged lines, unclear display, insensitivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65B32B27/28B32B9/00B32B9/04B32B15/04
CPCB32B9/00B32B9/041B32B9/043B32B27/283G01N21/658
Inventor 胡卫华赵雷
Owner SOUTHWEST UNIVERSITY
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