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Preparation method of fluorescent carbon quantum dots using vitamin as carbon source

A technology of carbon quantum dots and vitamins, which is applied in the field of preparation of fluorescent carbon quantum dots, can solve the problems of large individual differences in natural organisms, difficulty in repeating experimental results, unfavorable analysis, etc., and achieve simple cost performance, cheap devices, and many varieties.

Inactive Publication Date: 2017-10-17
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these substances are complex in composition and contain more impurities, which are not conducive to analysis
And due to the large individual differences of natural organisms, it is difficult to repeat the experimental results

Method used

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  • Preparation method of fluorescent carbon quantum dots using vitamin as carbon source
  • Preparation method of fluorescent carbon quantum dots using vitamin as carbon source
  • Preparation method of fluorescent carbon quantum dots using vitamin as carbon source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 0.1g vitamin B 9 Add to 35ml of deionized water, magnetically stir in a water bath at 90°C for 30min to form a uniform solution. Then transfer the resulting solution to a polytetrafluoroethylene reactor with a capacity of 50ml and react at 200°C for 2h. After being naturally cooled to room temperature, a yellow transparent liquid was obtained. After centrifugation at a speed of 12000 r / min for 20 minutes, the supernatant was taken and freeze-dried to obtain carbon quantum dots with strong blue fluorescence.

Embodiment 2

[0033] 0.1g vitamin B 9 Add it to 35ml of ethanol solution with a volume concentration of 30%, magnetically stir in a water bath at 90°C for 30min to form a uniform solution. Then transfer the resulting solution to a polytetrafluoroethylene reactor with a capacity of 50ml and react at 200°C for 2h. After being naturally cooled to room temperature, a yellow transparent liquid was obtained. After centrifugation at a speed of 12000 r / min for 20 minutes, the supernatant was taken and freeze-dried to obtain carbon quantum dots with strong blue fluorescence. The solvent in this example uses 30% ethanol solution, which can increase vitamin B 9 The solubility.

Embodiment 3

[0035] 0.1g vitamin B 9 Add to 35ml of ethylene glycol and magnetically stir for 30min to form a homogeneous solution. Then transfer the resulting solution to a polytetrafluoroethylene reactor with a capacity of 50ml and react at 200°C for 2h. After natural cooling to room temperature, a light brown transparent liquid was obtained. After centrifugation at a speed of 12000 r / min for 20 minutes, the supernatant was taken and freeze-dried to obtain carbon quantum dots with strong blue fluorescence. The solvent in this example is ethylene glycol, which is an organic solvent that can increase vitamin B 9 The solubility.

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Abstract

The invention relates to a preparation method of fluorescent carbon quantum dots. The invention discloses a method for preparing fluorescent carbon quantum dots using vitamins as a carbon source, comprising the steps of: a. preparing a vitamin solution: adding vitamins to a solvent and magnetically stirring in a water bath at room temperature to 100°C to obtain a vitamin solution ; b, solvothermal synthesis reaction: place the vitamin solution in a reaction kettle, and conduct heating reaction at 180-220°C; c, preparation of carbon quantum dots: after natural cooling to room temperature, centrifuge at a speed of 10000-15000r / min After 10-30 min, the supernatant was taken, freeze-dried to obtain fluorescent carbon quantum dots. The beneficial effect of the present invention is that the obtained carbon quantum dots have a small particle diameter of 2-5nm and are uniformly dispersed. It has high quantum yield and strong fluorescence characteristics, low toxicity and good biocompatibility, and can be applied to cell imaging and detection of Cu2+ and Fe3+.

Description

Technical field [0001] The invention relates to nanomaterials, in particular to a method for preparing fluorescent carbon quantum dots. Background technique [0002] In recent years, fluorescent carbon-based materials have attracted more and more attention due to their excellent properties, such as higher light absorption, high chemical stability, lower toxicity and better biocompatibility. These materials mainly include carbon quantum dots, nanodiamonds, carbon nanotubes, fullerenes and fluorescent graphene. The superior properties of fluorescent carbon-based materials make them have broad application prospects. Such as biomarkers, medical diagnosis, catalysis and photovoltaic devices, etc. Among them, carbon quantum dots have received the most extensive attention due to their unique photoelectric properties and edge effects caused by quantum confinement. [0003] Various methods for synthesizing carbon quantum dots have been developed, including: pyrolysis, electrochemical she...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15C09K11/65B82Y30/00B82Y40/00G01N21/64
Inventor 汪建新郑雅文杨旦翁杰冯波周绍兵鲁雄屈树新段可卢晓英智伟
Owner SOUTHWEST JIAOTONG UNIV