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Preparation method for ionic-liquid-modified carbon quantum dot

A technology of carbon quantum dots and ionic liquids, which is applied in the field of preparation of ionic liquid-modified carbon quantum dots, can solve the problems of difficulty in regulating the function of carbon quantum dots, lack of preparation methods, etc., achieve adjustable dispersion and optical properties, and improve separation efficiency , The effect of high fluorescence quantum yield

Active Publication Date: 2016-02-10
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the shortcomings of the lack of simple and feasible preparation methods in the existing field of carbon quantum dots and the difficulty in regulating the function of carbon quantum dots, the present invention provides a method for preparing carbon quantum dots modified by ionic liquids. The method is simple to operate, and the prepared carbon quantum dots Uniform particle size, adjustable solubility, high fluorescence quantum yield

Method used

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  • Preparation method for ionic-liquid-modified carbon quantum dot
  • Preparation method for ionic-liquid-modified carbon quantum dot
  • Preparation method for ionic-liquid-modified carbon quantum dot

Examples

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Embodiment 1

[0036] Disperse 1 gram of citric acid and 3.67 grams of 1-(3-aminopropyl)-3-methylimidazolium bromide in 20 ml of ultrapure water, remove the ultrapure water by rotary evaporation at 60°C to obtain a gel, and then argon Under protection, the jelly was stirred and refluxed at 240°C for 1 hour. After cooling, 30 ml of ultrapure water was added and the dispersion was placed in a dialysis bag with a molecular weight cut-off of 1000 for dialysis for 2 to 3 days. Fluoresces under light (eg figure 1 shown), indicating that carbon quantum dots were generated.

Embodiment 2

[0038] On the basis of Example 1, the pyrolysis temperature was increased to 260°C, and other conditions remained unchanged, and the dialysate was dried to obtain imidazole-based ionic liquid-modified, anion-Br - carbon quantum dots with a yield of 2.03% and an average particle size of 1.1nm (such as figure 2 shown), Φ=13.9% (as image 3 shown).

Embodiment 3

[0040] On the basis of Example 2, the stirring and reflux time was increased to 2 hours, and the other conditions were unchanged, and the imidazole ionic liquid was modified, and the anion was Br - carbon quantum dots with a yield of 10.3% and an average particle size of 1.1nm (such as Figure 4 shown), Φ=25.1% (as image 3 shown).

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Abstract

The invention discloses a preparation method for an ionic-liquid-modified carbon quantum dot. The preparation method comprises dissolving citric acid and aminoimidazolium bromide in ultrapure water, and dewatering to obtain a gelatinoids, then stirring and refluxing, adding ultrapure water for once-more dispersing after cooling, and then dialyzing for 2-3 days, and drying to obtain a carbon quantum dot of which the anion is bromide ion; dissolving the carbon quantum dot in ultrapure water, introducing a specific anion (such as N(CF3SO2)<2->) and an oil phase (such as ethyl acetate) into the carbon-quantum-dot-dissolved ultrapure water, so as to enable the carbon quantum dot to have anion exchange and be transferred from the ultrapure water phase to the oil phase, and separating the oil phase, so as to obtain the carbon quantum dot of which the anion is N(CF3SO2)<2->; and continuing introducing other anions(such as Cl<->), so as to enable the carbon quantum dot to be transferred into the ultrapure water phase from the oil phase. Through once or multitime phase transfer and separation of the oil phase and the ultrapure water phase, a series of high-purity carbon quantum dots which contain different anions and are adjustable in dissolvability and fluorescence property are obtained.

Description

technical field [0001] The invention relates to a preparation method of a class of ionic liquid modified carbon quantum dots, which belongs to the field of new materials. Background technique [0002] For a long time, the luminescent materials that have been widely concerned and practically applied in human life and production mainly include organic dyes, rare earth complexes, semiconductor quantum dots, and metal nanoclusters. Although these luminescent materials are rich in variety, high in quantum yield and adjustable in wavelength, they all have their limitations, such as high toxicity, easy degradation, poor photostability, high price, and non-renewable. Therefore, searching for new luminescent materials has always been the goal pursued by chemical and material scientists. [0003] Carbon quantum dots are carbon particles smaller than 10 nanometers that were discovered in 2004 due to luminescence and were successfully prepared for the first time in 2006 (X.Y.Xu, R.Ray,...

Claims

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Application Information

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IPC IPC(8): C09K11/65
Inventor 李洪光王宝刚阮红郝京诚
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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