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Carbon nano dot with adjustable light emission in visible-region whole spectral coverage and preparation method thereof

A full-spectrum, nano-dot technology, applied in the field of nano-materials, can solve the problem of adjusting the fluorescence emission of carbon nano-dots by the preparation method, and achieve the effect of solving the difficulty in regulating the emission band gap.

Inactive Publication Date: 2017-04-19
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing technology is to passively separate and obtain multicolor fluorescent carbon dots in the visible range through column chromatography. However, there is no clear preparation method to adjust the fluorescence emission of carbon nanodots in the full range of the visible range.

Method used

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  • Carbon nano dot with adjustable light emission in visible-region whole spectral coverage and preparation method thereof
  • Carbon nano dot with adjustable light emission in visible-region whole spectral coverage and preparation method thereof
  • Carbon nano dot with adjustable light emission in visible-region whole spectral coverage and preparation method thereof

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preparation example Construction

[0025] The invention provides a method for preparing carbon nano-dots with adjustable full-spectrum luminescence in the visible region, which is characterized in that it comprises the following steps:

[0026] dissolving citric acid and urea in a reaction solvent for solvothermal reaction to obtain carbon nanodots;

[0027] The reaction solvent includes one or more of water-miscible protic solvents and / or water-miscible aprotic solvents and water;

[0028] The mixing ratio of one or more of the water-miscible protic solvent and / or water-miscible aprotic solvent with water is 0-100%;

[0029] The mixing ratio of the water-miscible protic solvent and the water-miscible aprotic solvent is 0-100%.

[0030] The present invention changes the polarity of the reaction solvent under solvothermal conditions by adjusting the mixing ratio of water and the protic and aprotic solvents that are miscible therewith, so as to prepare carbon nanodots with full-spectrum luminescence in the visib...

Embodiment 1

[0053] 3 g of citric acid and 6 g of urea were used as reaction raw materials (the mixing ratio of the reaction raw materials was 1:2), and were dissolved in 30 ml of reaction solvent to obtain a colorless and transparent solution. Wherein, the mixed solution of the reaction solvent water and DMF, wherein the volume ratio of water and DMF in the reaction solvent is reacted according to the ratio shown in Table 1.

[0054] Heat the colorless transparent solution in a steel-lined polytetrafluoroethylene reactor at 160° C. for solvothermal reaction for 4 hours to obtain a reaction mixture;

[0055] The reaction mixture was mixed with 60 milliliters of ethanol, and centrifuged at a speed of 8000 rpm for 5 minutes; the upper layer liquid was removed (removing residual reactant and reaction solvent), and the precipitate was dissolved in 60 milliliters of ethanol and centrifuged 3 times, Until the upper liquid is relatively clear, the precipitate is taken and freeze-dried at -50°C fo...

Embodiment 2

[0061] 3 g of citric acid and 3 g of urea were used as reaction raw materials (the mixing ratio of the reaction raw materials was 1:1), and dissolved in 30 ml of reaction solvent to obtain a colorless and transparent solution. Wherein, the mixed solution of the reaction solvent water and DMF, wherein the volume ratio of water and DMF in the reaction solvent is reacted according to the ratio shown in Table 2.

[0062] Heat the colorless transparent solution in a steel-lined polytetrafluoroethylene reactor at 160° C. for solvothermal reaction for 4 hours to obtain a reaction mixture;

[0063] The reaction mixture was mixed with 60 milliliters of ethanol, and centrifuged at a speed of 8000 rpm for 5 minutes; the upper layer liquid was removed (removing residual reactant and reaction solvent), and the precipitate was dissolved in 60 milliliters of ethanol and centrifuged 3 times, Until the upper liquid is relatively clear, the precipitate is taken and freeze-dried at -50°C for 36 ...

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Abstract

The invention provides a preparation method of a carbon nano dot with adjustable light emission in visible-region whole spectral coverage. The preparation method comprises the following steps of dissolving citric acid and urea in a reactive solvent to carry out a solvothermal reaction, so as to obtain the carbon nano dot, wherein the reactive solvent comprises one or multiple of protonic solvents which are mutually soluble with water and / or non-protonic solvents which are mutually soluble with the water and the water; the mixing ratio of the water to the one or the multiple of the protonic solvents which are mutually soluble with the water and / or the non-protonic solvents which are mutually soluble with the water is 0 to 100 percent; and the mixing ratio of the protonic solvents which are mutually soluble with the water to the non-protonic solvents which are mutually soluble with the water is 0 to 100 percent. By using the preparation method, in a solvothermal condition, through regulating the mixing ratio of the water to the protonic solvents and the non-protonic solvents, which can be mutually soluble with the water, the carbon nano dot with the adjustable light emission in the visible-region whole spectral coverage can be prepared. The problem that a light-emitting band gap of the carbon nano dot is difficult to regulate and control is solved.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a carbon nano-dot with adjustable full-spectrum emission in the visible region and a preparation method thereof. Background technique [0002] Carbon nanodots (Carbon dots, CDots) are a new type of luminescent carbon nanomaterials, which have high fluorescence stability, no light flicker, wide and continuous excitation spectrum, tunable emission wavelength, good biocompatibility, and low toxicity. And other advantages, it is regarded as a potential substitute for organic dyes and semiconductor quantum dots. However, most of the fluorescence emission of carbon dots has been concentrated in the blue and green light bands, but the efficient luminescence in the yellow and red light bands is still difficult to achieve. Since its luminescence mechanism is still unclear, it is not clear how to control the luminescence bandgap of carbon dots. The existing technology i...

Claims

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Application Information

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IPC IPC(8): C09K11/65C01B32/15B82Y40/00B82Y20/00
CPCB82Y20/00B82Y40/00C01P2004/04C09K11/65
Inventor 曲松楠田震
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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