Nitrogen-sulfur self-doped fluorescent carbon quantum dot as well as preparation method and application thereof

A technology of carbon quantum dots and self-doping, applied in fluorescence/phosphorescence, chemical instruments and methods, nano-carbon, etc., to achieve the effect of simple raw materials, low quantum yield and high fluorescence quantum yield

Active Publication Date: 2020-08-25
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These strategies have greatly contributed to the production of high quantum yield (QY) and long-wavelength emitting CDs, but work remains to be done

Method used

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  • Nitrogen-sulfur self-doped fluorescent carbon quantum dot as well as preparation method and application thereof
  • Nitrogen-sulfur self-doped fluorescent carbon quantum dot as well as preparation method and application thereof
  • Nitrogen-sulfur self-doped fluorescent carbon quantum dot as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Weigh 1g of methylene blue into a beaker, add 20mL of ethanol, and dissolve it fully by ultrasonic;

[0029] 2) Put the above-mentioned clear solution that has been sonicated in a high-pressure reactor, and react at 200 ° C for 12 hours;

[0030] 3) Place the reacted solution in a rotary evaporator to remove excess ethanol, add secondary water to ultrasonically dissolve, centrifuge with a centrifuge, filter to remove insoluble matter to obtain a clear light yellow solution, pass through a dialysis bag, and put it in the container After at least 1 day of dialysis treatment, an aqueous solution of nitrogen and sulfur self-doped fluorescent carbon quantum dots is obtained;

[0031] 4) The target carbon quantum dots were obtained after freeze-drying the above aqueous solution of carbon quantum dots, and the relative quantum yield (taking quinine sulfate as a standard) was 60%.

[0032] 5) Characterization and application see Figure 1-8 ,Table 1.

Embodiment 2

[0034] 1) Weigh 1g of methylene blue into a beaker, add 20mL of ethanol, and dissolve it fully by ultrasonic;

[0035] 2) Put the above-mentioned ultrasonic clear solution in a high-pressure reactor, and react at 200°C for 6 hours;

[0036] 3) Place the reacted solution in a rotary evaporator to remove excess ethanol, add secondary water to ultrasonically dissolve, centrifuge with a centrifuge, filter to remove insoluble matter to obtain a clear light yellow solution, pass through a dialysis bag, and put it in the container After at least 1 day of dialysis treatment, an aqueous solution of nitrogen and sulfur self-doped fluorescent carbon quantum dots is obtained;

[0037] 4) The target carbon quantum dots were obtained after freeze-drying the above aqueous solution of carbon quantum dots, and the relative quantum yield (taking quinine sulfate as the standard) was 28%.

Embodiment 3

[0039] 1) Weigh 1g of methylene blue into a beaker, add 20mL of ethanol, and dissolve it fully by ultrasonic;

[0040] 2) Put the above-mentioned ultrasonic clear solution in a high-pressure reactor, and react at 220° C. for 6 hours;

[0041] 3) Place the reacted solution in a rotary evaporator to remove excess ethanol, add secondary water to ultrasonically dissolve, centrifuge with a centrifuge, filter to remove insoluble matter to obtain a clear light yellow solution, pass through a dialysis bag, in the container After at least 1 day of dialysis treatment, an aqueous solution of nitrogen and sulfur self-doped fluorescent carbon quantum dots is obtained;

[0042] 4) The target carbon quantum dots were obtained after freeze-drying the above aqueous solution of carbon quantum dots, and the relative quantum yield (taking quinine sulfate as a standard) was 20%.

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Abstract

The invention provides a nitrogen-sulfur self-doped fluorescent carbon quantum dot as well as a preparation method and application thereof. Methyl blue is used as a single precursor, ethyl alcohol isused as a solvent, after ultrasonic dissolution, a faint yellow solution is obtained through a high-temperature reaction; the ethyl alcohol solvent is removed through rotary evaporation, so that a viscous solid is obtained; water is added for dissolving the viscous solid; dialysis and purification are conducted in secondary water through a dialysis bag, so that a nitrogen-sulfur self-doped fluorescent carbon quantum dot aqueous solution is obtained. The preparation method disclosed by the invention is simple and low in cost; the self-doping of the prepared carbon quantum dot through in-situ carbonization of the precursor rich in nitrogen atoms and sulfur atoms is very necessary, and complex post-treatment procedures can be reduced. According to the prepared nitrogen-sulfur self-doped carbon quantum dot, the fluorescence quantum yield of the nitrogen-sulfur self-doped carbon quantum dot is up to 60%, the optical property of the nitrogen-sulfur self-doped carbon quantum dot is stable, and the biological toxicity of the nitrogen-sulfur self-doped carbon quantum dot is low. The carbon quantum dot disclosed by the invention can be used for detecting H2S in a water sample, blood or a redwine sample, can be used for cell imaging, intracellular H2S detection and zebra fish imaging, and can also be used in the field of fluorescence anti-counterfeiting.

Description

[0001] technology neighborhood [0002] The invention relates to a luminescent nanometer material, in particular to a nitrogen-sulfur self-doped fluorescent carbon quantum dot and its preparation method and application. Background technique [0003] With the development of carbon materials, materials based on carbon elements have been continuously discovered, such as fullerenes, carbon nanotubes, nanodiamonds, carbon nanofibers, and graphene. Carbon-based materials possess a wide range of properties owing to the existence of different allotropes as well as various microstructures. Carbon dots (CDs), as a new carbon nanomaterial, were first discovered in 2004 by Xu et al. in the process of purifying single-walled carbon nanotubes by arc discharge. Those with sizes smaller than 10 nm exhibit strong fluorescence, and the emission can be tuned depending on size, surface structure, and excitation wavelength. Compared with traditional semiconducting quantum dots and organic dyes, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C09K11/65B82Y20/00B82Y30/00B82Y40/00G01N21/64
CPCC01B32/15C09K11/65C09K11/0883B82Y20/00B82Y30/00B82Y40/00G01N21/64G01N2021/6497
Inventor 杜芳芳成哲王光辉双少敏董川
Owner SHANXI UNIV
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