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A Latent Fingerprint Visualization and Chemical Residue Detection Method Based on Upconversion Nanoparticles

A technology of nanoparticles and chemical residues, applied in the field of detection, can solve the problem of not being able to detect other information of fingerprints at the same time

Active Publication Date: 2020-10-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current detection methods can only accurately detect fingerprint information, but cannot detect other information on the fingerprint at the same time, which is usually valuable evidence of crimes

Method used

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  • A Latent Fingerprint Visualization and Chemical Residue Detection Method Based on Upconversion Nanoparticles
  • A Latent Fingerprint Visualization and Chemical Residue Detection Method Based on Upconversion Nanoparticles
  • A Latent Fingerprint Visualization and Chemical Residue Detection Method Based on Upconversion Nanoparticles

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1) Up-conversion nanoparticles NaYF with hexagonal structure 4 :Yb 3+ / Tm 3+ preparation

[0044] The classic high-temperature pyrolysis method is prepared, and 1 mmol of YCl 3 YbCl 3 TmCl 3 =79.5:20:0.5 was added to the three-necked flask, 6mlOA and 15mlODE were respectively added to the three-necked flask, vacuumed, heated to 160°C with nitrogen gas to dissolve, lowered to 18-25°C, added dropwise 4 F and NaOH were added to 10ml of methanol solution (CH 3 OH), ultrasonically dissolved to obtain solution 2, which was added dropwise into the three-necked flask, mixed and stirred for 30 minutes, and heated with nitrogen gas. In this case, methanol will volatilize at 65-80°C, enrich in the buffer bottle, and After the reaction, pour it into a waste bottle, then raise the temperature to 310°C for 1-2 hours, cool to room temperature, add ethanol and centrifuge to collect the product, and dry it;

[0045] 2) Detect fingerprint residue

[0046] Use detergent to wash of...

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Abstract

The invention discloses a latent fingerprint development and chemical residue detection method based on upconversion nanoparticles. The method comprises the following steps: preparing the upconversionnanoparticles NaYF4:Yb<3+> / Tm<3+> with a hexagonal structure; preparing a latent fingerprint sample; forming a ligand compound; developing latent fingerprints. With the adoption of the upconversion nanoparticles, interference in the fingerprints is small, color development speed is higher, background interference is small, latent information of the latent fingerprints is not damaged, DNA identification of the latent fingerprints is not affected, toxic and side effects are avoided in synthesis and detection processes, nicotine development fluorescence change is obvious, sensitivity is high, detection equipment is portable, all devices used for the whole detection are portable and movable, and on-site detection is facilitated.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a method for displaying latent fingerprints and chemical residues by upconverting nanoparticles. Background technique [0002] Fingerprints are one of the most useful types of physical evidence, specifically the papillary pattern on the skin surface of the human hand, which is a typical genetic trait. As a kind of physical evidence, tattoo has been hailed as "the first evidence" and has been recognized all over the world. It is widely used in investigating cases and authenticating criminals. How to find, visualize and collect it on a wide variety of objects at a crime scene is a key issue in the utilization of fingerprints. So far, fingerprint detection methods have been varied, and various imaging technologies have been continuously improved. However, most of the current detection methods can only accurately detect fingerprint information, but cannot detect other...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
CPCG01N21/6402
Inventor 王敏赵子潇
Owner ZHEJIANG UNIV
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