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Wavelength-adjustable solid carbon dot and preparation method thereof

A carbon dot, solid state technology, applied in chemical instruments and methods, nanocarbon, nanotechnology for materials and surface science, etc., can solve problems such as limiting the application of carbon dots, and achieve the effect of high repeatability and simple method

Active Publication Date: 2022-05-24
HUBEI UNIV OF EDUCATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, most of the carbon dots reported in the current literature are carbon dots that emit light at a single wavelength, which greatly limits the application of carbon dots in optoelectronic devices, multicolor light sources, and biological imaging.

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  • Wavelength-adjustable solid carbon dot and preparation method thereof
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  • Wavelength-adjustable solid carbon dot and preparation method thereof

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preparation example Construction

[0035] The invention provides a preparation method of wavelength-tunable solid carbon dots, such as figure 1 shown, including the following steps:

[0036] S1. Mix citric acid and urea in a mass ratio of 1:0.6 to 4, heat at 160 to 200°C for 6 to 12 hours, cool, dialysis purification, freezing, and vacuum drying to obtain carbon dot powder; the dialysis purification time For 24-72h, the size of the dialysis bag is 3500-500D.

[0037] S2. Dissolve the carbon dot powder in the passivating agent, and configure it into a carbon dot solution;

[0038] The passivating agent is a composite solvent of one or more solvents in sulfuric acid, phosphoric acid, boric acid and nitric acid;

[0039] The mass-volume ratio of the carbon dot powder to the passivating agent is 1-2 mg: 50-200 mL.

[0040] S3. Immerse the nanoporous glass sheet in the carbon dot solution.

[0041] S4, react under the condition of 140~200℃ for 4~8h, take out the nanoporous glass sheet, and dry to obtain the soli...

Embodiment 1

[0049] Weigh 1 g of citric acid and 2 g of urea into a beaker, grind evenly, add 30 mL of deionized water, stir evenly, put it into the inner tank of a polytetrafluoroethylene reactor, put the reactor into an oven, and set the reaction temperature to 160 ℃, the reaction time is 8h; after the reaction is over, put it into a 3500D dialysis bag, dialyze for 36h, and further purify the reactant; collect the liquid in the dialysis bag, put it into a freeze dryer, and obtain a powder sample.

[0050] Dissolve 0.5 mg of powdered carbon dots in 5 mL of H 2 SO 4 , ultrasonic for 30 min to obtain a uniform carbon dot solution; take 1 nanoporous glass sheet, heat it in a reaction furnace at 200 °C for 6 h; then, dry it at a low temperature of 40 °C for 120 min to obtain a nanoporous glass sheet based Sulfur-doped solid carbon dots, labeled as S-CDs. Its fluorescence spectrum is Figure 4 As shown in the figure, it can be seen from the figure that its wavelength can be adjusted from 38...

Embodiment 2

[0052]Weigh 1 g of citric acid and 4 g of urea into a beaker, grind evenly, add 30 mL of deionized water, stir evenly, put it into the inner tank of a polytetrafluoroethylene reactor, put the reactor into an oven, and set the reaction temperature to 190 ℃, the reaction time is 5h; after the reaction is over, put it into a 2000D dialysis bag, dialyze it for 36h, and further purify the reactant; collect the liquid in the dialysis bag, put it into a freeze dryer, and obtain a powder sample.

[0053] Dissolve 1.2 mg of powdered carbon dots in 18 mL of H 3 BO 4 medium, ultrasonic for 30 min to obtain a uniform carbon dot solution; take 1 piece of nanoporous glass sheet, heat it in a reaction furnace at 180 °C for 5 h; then, dry it at a low temperature of 80 °C for 50 mins to obtain a nanoporous glass sheet-based Boron-doped solid carbon dots, labeled as B-CDs. Its fluorescence spectrum is Figure 5 As shown, it can be seen from the figure that its wavelength can be adjusted from...

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Abstract

The invention discloses a preparation method of wavelength-adjustable solid carbon dots, which comprises the following steps: dissolving carbon dot powder in a passivating agent to prepare a carbon dot solution, soaking a nano-porous glass sheet in the carbon dot solution, reacting at 140-200 DEG C for 4-8 hours, taking out the nano-porous glass sheet, and drying to obtain the wavelength-adjustable solid carbon dots. The wavelength of the solid carbon dot based on the nano-porous glass can be regulated and controlled. The fluorescent carbon dots prepared by the method are stable in luminescence, high in fluorescence intensity, wide in wavelength adjustable range, simple to operate, green and environment-friendly, and can be prepared in batches, and multicolor luminescence of the solid carbon dots is realized.

Description

technical field [0001] The invention relates to the technical field of fluorescent carbon nanomaterials. More specifically, the present invention relates to a wavelength-tunable solid carbon dot and a preparation method thereof. Background technique [0002] Carbon dots are one-dimensional nanomaterials with fluorescent properties. They have a wide spectral range, good luminescence stability, and are easy to modify and synthesize. Due to the advantages of diversity and environmental safety, it has attracted great attention in the fields of optoelectronic devices, ion detection, sensing, and biomedicine. [0003] However, most of the carbon dots reported in the literature are carbon dots that emit light at a single wavelength, which greatly limits the application of carbon dots in optoelectronic devices, multicolor light sources, and biological imaging. In addition, carbon dots have good luminescence properties in solution, while aggregation-induced fluorescence quenching i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/02C01B32/15B82Y20/00B82Y40/00B82Y30/00
CPCC09K11/65C09K11/025C01B32/15B82Y20/00B82Y40/00B82Y30/00Y02E10/52
Inventor 马云秀李莎王怀兴李杰吉紫娟程莉
Owner HUBEI UNIV OF EDUCATION
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