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Application of oil-soluble carbon dots in fingerprint detection

A fingerprint detection and oil-soluble technology, which is applied in the field of nanomaterials, can solve the problems of low resolution and less reporting of oil-soluble carbon dots, and achieve good results, environmentally friendly methods, and strong applicability

Pending Publication Date: 2021-10-19
SOUTH CHINA AGRI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, oil-soluble carbon dots for solid-state fluorescence are rarely reported
[0003] At present, there are a small number of reports about the application of fluorescent carbon dots in fingerprint detection, but these fluorescent carbon dots are all water-soluble, and fingers often carry secretions such as oil (organic matter), sodium chloride, etc., making existing fluorescent carbon dots Dots have low resolution when detecting fingerprints

Method used

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  • Application of oil-soluble carbon dots in fingerprint detection
  • Application of oil-soluble carbon dots in fingerprint detection
  • Application of oil-soluble carbon dots in fingerprint detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: the preparation of oil-soluble carbon dot

[0026] First, add 501.0mg of dithiosalicylic acid into 50ml of acetic acid solution and stir until completely dissolved, then add 2.5mL of ethylenediamine, stir for 2h, then transfer the mixed solution into a reaction kettle, heat to 170°C and keep it for 10h; naturally cool to After room temperature, the reacted solution was poured into 1L of boiling water, filtered, and dried in an oven at 60°C to obtain pure oil-soluble carbon dots.

[0027] figure 1 It is the fluorescence spectrum of oil-soluble carbon dots. It can be seen from the figure that the carbon dots have no obvious excitation-dependent phenomenon. Its emission wavelength does not redshift with the redshift of the excitation wavelength. The luminescent center of the carbon dots is always in the red light region of 620nm. Optimal excitation is at 560nm. figure 2 It is an XRD pattern of oil-soluble carbon dots, and the diffraction peak centered at 2...

Embodiment 2

[0028] Embodiment 2: Preparation of time detection label

[0029] First wash your hands with soap and water, then use your fingers across your forehead, and press them on substrates such as glass, paper, and plastic sheets; then use the classic powder spray method to sprinkle the oil-soluble carbon dots obtained in Example 1 on the fingerprints. ; Next, use a brush to gently wipe off the excess powder; finally, the bright red fingerprint fluorescent pattern can be clearly seen under the ultraviolet light. Figure 5 A fingerprint map is shown, from which obvious fingerprint features can be observed, including bows, rings, and wheels. The six parts of the fingerprint prepared by carbon dots were amplified, and the characteristic points of bifurcation, island, termination, eye, nucleus, ridge divergence and intersection were observed respectively.

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Abstract

The invention belongs to the technical field of nano materials, and discloses application of oil-soluble carbon dots in fingerprint detection. The oil-soluble carbon dots are prepared according to the following preparation method: adding 501.0 mg of dithiosalicylic acid into 50ml of an acetic acid solution, conducting stirring until the dithiosalicylic acid is completely dissolved, adding 2.5 mL of ethylenediamine, conducting stirring for 2 hours, then transferring the mixed solution into a reaction kettle, conducting heating to 160-200 DEG C, and preserving heat for 4-12 hours; and naturally conducting cooling to room temperature, pouring the reacted solution into boiling water, and conducting filtering and drying to obtain the oil-soluble carbon dots. The raw materials provided by the invention are easy to obtain, the preparation method is simple, green and environment-friendly, and strong in applicability, and the obtained oil-soluble carbon dots have a better application prospect in the aspect of fingerprint detection.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to the application of oil-soluble carbon dots in fingerprint detection. Background technique [0002] In recent years, carbon dots have emerged as effective substitutes for quantum dots in inorganic semiconductors and have broad applications in the fields of sensors, optoelectronics, catalysis, bioimaging, drug delivery, and optoelectronics. Compared with quantum dots, carbon dots combine strong tunable photoluminescence (PL), good biocompatibility, low toxicity, high resistance to photobleaching, and low cost. Carbon dots, as a new type of luminescent carbon nanoparticles smaller than 10nm, have attracted the attention of many researchers. Surface passivation and chemical oxidation are common methods to improve the performance of carbon dots, but they are not suitable for large-scale modification due to the complicated process. Heteroatom doping, as a simp...

Claims

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Application Information

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IPC IPC(8): C01B32/15C09K11/65G01N21/64
CPCC01B32/15C09K11/65G01N21/6428
Inventor 刘应亮许晓凯胡超凡庄健乐董汉武雷炳富张学杰张浩然李唯
Owner SOUTH CHINA AGRI UNIV
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