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High-fullerene based carbon quantum dot and preparation method thereof

A technology of fullerene-based carbon quantum and fullerene carbon ash, which is applied in chemical instruments and methods, nanotechnology, nano-optics, etc., can solve the problems of high cost and high energy consumption, and achieve low cost, good dispersion, Simple operation effect

Inactive Publication Date: 2019-01-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for preparing CQD mainly include microwave method, electrochemical method, pyrolysis method, etc. These methods have disadvantages such as high cost and high energy consumption for large-scale batch production.

Method used

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  • High-fullerene based carbon quantum dot and preparation method thereof
  • High-fullerene based carbon quantum dot and preparation method thereof
  • High-fullerene based carbon quantum dot and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 100mg of fullerene carbon ash to 10ml concentrated HNO 3 middle. It was heated to 100° C. with stirring and allowed to react for 12 hours. After cooling the reaction mixture to room temperature, the mixture was centrifuged at 5,000 r / min for 30 minutes to remove large particles, and then the supernatant was dialyzed for 3 days using a dialysis bag with a molecular weight cut-off of 3,500 Da to remove the inorganic substances present therein. Salt and small molecule impurities. After the dialysis is completed, the dialysate is concentrated by rotary evaporation to about 5ml, then poured into a petri dish to freeze, and finally put into a freeze dryer to dry to powder.

Embodiment 2

[0028] Add 100mg of fullerene carbon ash to 20ml concentrated HNO 3 middle. It was heated to 100° C. with stirring and allowed to react for 12 hours. After cooling the reaction mixture to room temperature, the mixture was centrifuged at 5,000 r / min for 30 minutes to remove large particles, and then the supernatant was dialyzed for 3 days using a dialysis bag with a molecular weight cut-off of 3,500 Da to remove the inorganic substances present therein. Salt and small molecule impurities. After the dialysis is completed, the dialysate is concentrated by rotary evaporation to about 5ml, then poured into a petri dish to freeze, and finally put into a freeze dryer to dry to powder.

Embodiment 3

[0030] Add 200mg of fullerene carbon ash to 30ml concentrated HNO 3 middle. It was heated to 100° C. with stirring and allowed to react for 12 hours. After cooling the reaction mixture to room temperature, the mixture was centrifuged at 5,000 r / min for 30 minutes to remove large particles, and then the supernatant was dialyzed for 3 days using a dialysis bag with a molecular weight cut-off of 3,500 Da to remove the inorganic substances present therein. Salt and small molecule impurities. After the dialysis is completed, the dialysate is concentrated by rotary evaporation to about 5ml, then poured into a petri dish to freeze, and finally put into a freeze dryer to dry to powder.

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Abstract

The invention provides a high-fullerene based carbon quantum dot and a preparation method thereof. The preparation method comprises the steps that S1, fullerene carbon dust is heated and stirred in concentrated acid for oxidization; S2, the reaction mixture in the step S1is cooled to room temperature, then large-particle inorganic salt with the molecular weight of 3500 Da and micromolecular impurities in the mixture are removed; S3, reaction liquid treated in the step S2 is evaporated and concentrated and subjected to freeze drying into powder, and the high-fullerene based carbon quantum dot is obtained. The fullerene carbon dust and the concentrated acid are adopted as raw materials, and the carbon quantum dot is obtained through heating reflux. By adopting the method, reaction heating isuniform, control is easy, the used raw materials are low in cost, the target product is easy to obtain, the obtained carbon quantum dot is uniform in distribution, and the operation is simple. The obtained carbon quantum dot is good in dispersity in water and uniform in size.

Description

technical field [0001] The invention relates to the field of carbon materials, in particular to a high-performance fullerene-based fluorescent carbon quantum dot and a preparation method thereof. Background technique [0002] Carbon quantum dot (CQD) is a new type of carbon nanomaterial with a diameter below 10nm. In 2004, Xu et al. isolated a new fluorescent carbon nanotube for the first time when purifying single-walled carbon nanotubes from arc discharge ash. Material. In 2006, Sun et al. proposed a new strategy to improve the fluorescence quantum yield of fluorescent carbon nano-dots - the surface passivation method, and named the fluorescent carbon nano-dots "carbon quantum dots". Ordinary carbon usually has weak luminescence and poor water solubility, but carbon quantum dots have good water solubility and fluorescence characteristics, and have the advantages of non-toxicity, little harm to the environment, and low cost. In the past few years, tremendous progress has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65
Inventor 冯永强王潇冯亮亮黄剑锋曹丽云董沛沛刘倩倩
Owner SHAANXI UNIV OF SCI & TECH
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