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A kind of preparation method and application of carbon quantum dots

A carbon quantum dot and reaction technology, which is applied in the preparation of carbon quantum dots, the detection of mercury ions and the application of fingerprints, can solve the problems of inability to realize rapid on-site detection in time, complex sample preparation and processing process, expensive large-scale equipment, etc. , to achieve the effect of non-toxic side effects, easy operation and simple method

Active Publication Date: 2019-06-25
TIANCHANG HUASHENG BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods are sensitive and reliable, there are some shortcomings: 1) expensive large-scale equipment is required; 2) the sample preparation and processing process is relatively complicated; 3) the selectivity is poor; 4) the on-site rapid detection cannot be realized in time, etc.

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  • A kind of preparation method and application of carbon quantum dots
  • A kind of preparation method and application of carbon quantum dots
  • A kind of preparation method and application of carbon quantum dots

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Experimental program
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Embodiment 1

[0036] Embodiment 1, a kind of preparation method of carbon quantum dots:

[0037] First put 1 g of trisodium citrate and 2 g of urea into a stainless steel reactor, then add 10-15 mL of dimethylformamide to it, heat the mixture to 160 ° C, and the reaction is carried out for about 6 h After that, the mixed solution was cooled to room temperature, centrifuged at about 8000 rpm for about 10 min, the supernatant was removed, and the solid precipitate was dried to obtain fluorescent carbon quantum dot powder.

[0038] The prepared fluorescent carbon quantum dot powder exhibits green light emission under an ultraviolet light source, and its fluorescence spectrum is excited at a wavelength of 420 nm, and the fluorescent carbon quantum dot has a strong emission peak at 530 nm (attached). figure 1 ), the inset corresponds to the photo of carbon quantum dot powder under fluorescent and UV light. When the fluorescent carbon quantum dot solution is excited at 370 nm, the emission peak ...

Embodiment 2

[0039] Embodiment 2. The synthetic fluorescent carbon quantum dot solution is applied to environmental water samples by the method of fluorescence detection:

[0040] Fluorescent carbon quantum dots as probes to detect Hg 2+ During the process, the sample to be tested is mixed with the C-dots fluorescence detection probe in a volume ratio of 1:1, that is, 150 µL of Hg 2+ The solution sample was added to 150 µL C-dots fluorescence detection probe. All sensitivity experiments and selectivity experiments were carried out according to the above ratios. The specific experimental process is as follows:

[0041] In order to confirm that the carbon quantum dot solution acts as a fluorescent probe to detect Hg 2+ For practicality, we collected water samples in the actual environment, such as taking samples from freshwater lakes on campus for testing, filtering them through a 0.2 µm membrane, and then preparing the lake water with different concentrations (0.001-100 μM) of Hg 2+ solut...

Embodiment 3

[0043] Embodiment 3. The synthetic fluorescent carbon quantum dot powder is used for fingerprint identification:

[0044] First grind the solid carbon quantum dots into powder with an agate mortar, then prepare a clean silicon wafer, press your finger on the silicon wafer to fingerprint, and use the shaking method to spread the powder on the sample printed with latent fingerprints by means of a paper slot. And gently tap the sample carrier silicon wafer to recover the carbon quantum dot powder. The area with fingerprint samples has a certain adsorption effect on the carbon quantum dot powder due to the sebum in the fingerprint sweat component, and the carbon quantum dots remain on the surface of the latent fingerprint. Dot powder will show a clear image of fingerprints that can be repeated several times and then viewed under UV light. attached Figure 8 This is an imaging photo of latent fingerprints displayed by fluorescent carbon quantum dot powder. It can be seen that the ...

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Abstract

The invention provides a preparation method and an application of a carbon quantum dot. The preparation method comprises steps as follows: trisodium citrate and urea are put in a reaction kettle, dimethyl formamide is added, after the reaction kettle is closed, a mixed solution is heated to 150-200 DEG C and then subjected to cooling, centrifugation and supernatant removal, solids are precipitated and dried, and fluorescent carbon quantum dot powder is obtained, wherein the size of the fluorescent carbon quantum dot is 3-5 nm, and the fluorescent carbon quantum dot performs green fluorescence emission under an ultraviolet source, has high sensitivity and selectivity on mercury ions, can be taken as a fluorescence probe for detecting the mercury ions, is suitable for detecting the mercury ions in water such as lake water in the natural environment, and has better environmental suitability; the carbon quantum dot can be directly used for living cell fluorescence imaging without surface finish or modification, and can also be used for detecting the mercury ions in living biological cells with a fluorescence imaging method. Besides, the synthesized fluorescent carbon quantum dot can further be applied to appearing and recognition of latent fingerprints.

Description

technical field [0001] The invention belongs to the technical field of nanometer detection, and in particular relates to a preparation method of carbon quantum dots and its application in detecting mercury ions and developing fingerprints. Background technique [0002] Carbon is the most abundant element in the earth and the universe. It is important that life on earth is based on carbon, so carbon nanomaterials are less toxic to living organisms than nanomaterials of other elements. Many, biosafety is also high, basically will not bring environmental problems. Gradually, carbon quantum dots (also known as carbon dots) became a dazzling new star in the carbon nanofamily. However, it has received increasing attention because of its better water solubility, photobleaching resistance, low toxicity, and biocompatibility compared to conventional semiconductor quantum dots and organic dyes. and many more. Therefore, it can be applied in the fields of biomarkers, detection and s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65G01N21/64C01B32/15B82Y40/00B82Y20/00A61B5/1172
CPCA61B5/1172C01P2004/64C09K11/65G01N21/6428G01N21/6486
Inventor 柴芳任国娟王海燕于丽颖祝宝雅曲凤玉高洪泽
Owner TIANCHANG HUASHENG BIOLOGICAL TECH
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