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Nitrogen-sulfur codoped fluorescent carbon dots with high quantum yield as well as preparation method and application of nitrogen-sulfur codoped fluorescent carbon dots

A nitrogen-sulfur co-doping, fluorescent carbon dot technology, applied in fluorescence/phosphorescence, chemical instruments and methods, nano-optics, etc., can solve the problems of unclear luminescence mechanism, complex preparation process, low fluorescence quantum yield, etc. Good water solubility, simple preparation method, mild and controllable reaction conditions

Active Publication Date: 2018-10-16
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there have been many researches on the preparation of carbon dots and related applications, there are still problems such as complex preparation process, low fluorescence quantum yield, and unclear luminescence mechanism. Therefore, we are looking for a simple, high fluorescence quantum yield. method is very necessary, in addition to the continuous expansion of the application of fluorescent carbon dots is also very necessary

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  • Nitrogen-sulfur codoped fluorescent carbon dots with high quantum yield as well as preparation method and application of nitrogen-sulfur codoped fluorescent carbon dots
  • Nitrogen-sulfur codoped fluorescent carbon dots with high quantum yield as well as preparation method and application of nitrogen-sulfur codoped fluorescent carbon dots
  • Nitrogen-sulfur codoped fluorescent carbon dots with high quantum yield as well as preparation method and application of nitrogen-sulfur codoped fluorescent carbon dots

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Effect test

Embodiment 1

[0039] (1) Preparation method of nitrogen-sulfur co-doped fluorescent carbon dots with high quantum yield

[0040] Put 0.30g of tartaric acid and 0.50g of L-cysteine ​​in a polytetrafluoroethylene reactor, and after hydrothermal reaction at 210°C for 5 hours, cool down to room temperature naturally, add 20mL of ultrapure water to dissolve, and then use Filter with filter paper, centrifuge (10000rpm, 10min), then filter with a 0.22μm filter head, and finally perform dialysis to obtain a brown nitrogen-sulfur co-doped fluorescent carbon dot solution. Put the carbon dot solution under the irradiation of 365nm ultraviolet lamp, and it can be observed that the carbon dot solution emits bright blue fluorescence. The carbon dot solution is freeze-dried to obtain fluorescent carbon dot solid powder.

[0041] The carbon dot solution prepared in this example uses quinine sulfate as a standard substance, and the fluorescence quantum yield of the carbon dot can be measured to be 19.1%. ...

Embodiment 2

[0054] Example 2 Application of nitrogen and sulfur co-doped fluorescent carbon dots in fingerprint detection

[0055] Take 0.5g of starch and 1mL of the fluorescent carbon dot aqueous solution prepared in Example 1 with a concentration of 100μg / mL. After mixing, add 5mL of acetone, stir evenly, and then sonicate for 2h to obtain a paste, dry it at 60C°, and use agate Grind into powder in a mortar and set aside. After that, use a special fingerprint brush for criminal investigation to evenly shake the above powder onto the glass sheet with fingerprints, and then brush along the fingerprint lines to display. After removing excess powder, take a fingerprint image under the irradiation of a 365nm ultraviolet lamp. Such as Figure 12 As shown, the fluorescent carbon dots showed a clear fingerprint image under the irradiation of 365nm ultraviolet light.

Embodiment 3

[0056] Example 3 Nitrogen and sulfur co-doped fluorescent carbon dots in Hg 2+ Applications in testing

[0057] In 2mL concentration of 150μg / mL fluorescent carbon dot aqueous solution prepared in Example 1, add 1mL (pH5.91) phosphate buffer solution, then add gradient volume of Hg 2+ solution, stirred evenly and reacted for 5 minutes, and scanned the fluorescence spectrum to obtain Figure 13 . Depend on Figure 13 It can be seen that with Hg 2+ Continuously adding, the fluorescence intensity of carbon dots gradually decreases, and there is a good linear relationship in the range of 50-125 μg / mL, and the linear equation is F=0.396[Hg 2+ ]+147.5, correlation coefficient R 2 =0.996, the detection limit was 5.69 μg / mL. The detection method is easy to operate and has high sensitivity. It is an excellent Hg 2+ fluorescent probe.

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Abstract

The invention relates to nitrogen-sulfur codoped fluorescent carbon dots with high quantum yield as well as a preparation method and an application of the nitrogen-sulfur codoped fluorescent carbon dots. According to the technical scheme, tartaric acid and L-cysteine are added to a hydrothermal reactor, a mixture is subjected to a heating reaction for 3-8 h at the temperature of 160-210 DEG C, naturally cooled to the room temperature ultrapure water is added for dissolving, a mixed solution is filtered, centrifuged, dialyzed and freeze-dried, and purified fluorescent carbon dot powder is obtained. The quantum yield of the fluorescent carbon dots can reach 19.1%. The nitrogen-sulfur codoped fluorescent carbon dots can be applied to fingerprint detection and Hg<2+> detection and have great significance for fingerprint development and extraction. Besides, sulfydryl in the nitrogen-sulfur codoped fluorescent carbon dots has strong affinity effect with Hg<2+>, and therefore, the nitrogen-sulfur codoped fluorescent carbon dots have great significance in study on the environmental chemistry. Finally, the fluorescent carbon dots can also be applied to degradation of methylene blue in printing and dyeing wastewater.

Description

technical field [0001] The invention relates to the technical field of carbon nanomaterials, in particular to a preparation method and application of nitrogen and sulfur co-doped fluorescent carbon dots. Background technique [0002] Carbon dots (Carbon Dots), as a fluorescent nanomaterial with a size of less than 10nm, mainly contain functional groups such as -COOH and -OH on the surface, making it have good water solubility and biocompatibility, in addition, it has low toxicity, photosensitive Stability, resistance to photobleaching and excellent photoluminescent properties. In the past ten years, more and more scientific researchers have paid attention to the development and application of carbon dots in various fields. For example, carbon dots are used as fluorescent probes to detect metal ions and antibacterial drugs, or are used in cell and in vivo imaging, or in photocatalysis, optoelectronic devices, and organic solar cells. Although there have been many researches...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00B01J27/24G01N21/64C02F1/30C02F101/36C02F101/38
CPCG01N21/6402G01N21/643C09K11/65B82Y20/00B82Y40/00C02F1/30B01J27/24C02F2101/308C02F2101/40C02F2101/38C02F2101/36C02F2305/10B01J35/23B01J35/39
Inventor 郭兴家张立志王祚伟郝爱军
Owner LIAONING UNIVERSITY
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