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Batch synthesis method for green fluorescent nano carbon clusters

A green fluorescence, carbon nanocluster technology, applied in the multi-intersection research field, can solve the problems of low fluorescence quantum yield, no carbon cluster research papers and patent publications, etc., to achieve broad application prospects, easy to scale batches Simple effect of production, separation and purification

Active Publication Date: 2017-02-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fluorescence emitted by carbon dots is mainly blue fluorescence, and there are also a small number of reports that carbon dots emitting green fluorescence can be prepared. Compared with blue fluorescent carbon dots, the fluorescence quantum production of carbon dots emitting green fluorescence much lower rate
[0004] So far, no research papers and patents related to carbon clusters have been published

Method used

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  • Batch synthesis method for green fluorescent nano carbon clusters
  • Batch synthesis method for green fluorescent nano carbon clusters
  • Batch synthesis method for green fluorescent nano carbon clusters

Examples

Experimental program
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Effect test

Embodiment 1

[0040] This embodiment relates to a new method for preparing carbon nanoclusters, the method comprising the following steps:

[0041] Using glucose as the carbon precursor and leucine as the auxiliary reagent, the fluorescent carbon nanoclusters were prepared by reacting in an ethylene glycol medium, specifically:

[0042] (1) At room temperature, weigh 0.5g glucose and 0.5g leucine, dissolve them in a 25mL ethylene glycol round-bottomed flask under magnetic stirring, add concentrated phosphoric acid to the mixture, and make a mass ratio of 15 % ethylene glycol phosphoric acid solution, after the reactants are completely dissolved, heat to reflux for reaction, keep the temperature at 140°C and keep the reaction for 60 minutes, the concentration of the reaction solution turns from colorless and transparent to a dark brown solution, stop the reaction, cool and purify and separate.

[0043] (2) centrifuge the mixed solution obtained in step (1) at 5000r / min, and discard the preci...

Embodiment 2

[0048] Using citric acid as a carbon precursor and glutathione as an auxiliary reagent, the fluorescent carbon nanoclusters were prepared by reacting in an ethylene glycol medium, specifically:

[0049] (1) At room temperature, weigh 1g of citric acid and 0.5g of glutathione, dissolve them in a 25mL ethylene glycol round-bottomed flask under magnetic stirring, add concentrated phosphoric acid to the mixture, and make a mass ratio 5% phosphoric acid ethylene glycol solution, after the reactants are completely dissolved, heat to reflux for reaction, keep the temperature at 160°C and keep the reaction for 80 minutes, the concentration of the reaction solution turns from colorless and transparent to a dark brown solution, stop the reaction, cool and purify and separate.

[0050] (2) centrifuge the mixed solution obtained in step (1) at 8000r / min, and discard the precipitate.

[0051] (3) Put the supernatant in step (2) into a dialysis bag with a molecular weight cut-off of 500, pl...

Embodiment 3

[0055] Using citric acid as a carbon precursor and horseradish peroxygenase as an auxiliary reagent, react fluorescent carbon nanoclusters in a glycerol medium, specifically:

[0056] (1) At room temperature, weigh 1g of citric acid and 0.25g of horseradish peroxygenase, dissolve them in a 25mL ethylene glycol round-bottomed flask under magnetic stirring, and add concentrated phosphoric acid to the mixture to prepare the mass Compared with 20% phosphoric acid ethylene glycol solution, after the reactant is completely dissolved, heat to reflux for reaction, keep the temperature at 180°C and keep the reaction for 120min, the concentration of the reaction solution turns from colorless and transparent to a dark brown solution, stop the reaction, cool and purify and separate .

[0057] (2) centrifuge the mixed solution obtained in step (1) at 7000r / min, and discard the precipitate.

[0058] (3) The supernatant in step (2) is placed in a large amount of ultrapure water in a dialysi...

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Abstract

The invention provides a batch synthesis method for green fluorescent nano carbon clusters. The method comprises the following steps: 1) taking reductibility organic micromolecules as a carbon nano cluster precursor; 2) employing amino acid and polypeptide or soluble biomacromolecules as an auxiliary reagent; 3) mixing the carbon nano cluster precursor and the auxiliary reagent, dissolving a mixture in an organic polar solvent, adding phosphoric acid for reacting for a while at constant temperature, stopping the reaction after the color of a reaction solution is changed from transparent to brown; and 4) centrifuging the reacted mixing solution, removing the impurity, gradually dialyzing and separating, removing an unreacted reactant and a few of monodisperse carbon dots, through rotary-evaporation concentration and freeze drying processing, obtaining the high-purity fluorescent nano carbon clusters powder. According to the invention, one-step batch synthesis of fluorescent clusters is realized, further passivation processing is not required, and the fluorescent quantum yield of the prepared nano carbon clusters is higher than that of the single carbon dot prepared with same batch.

Description

technical field [0001] The invention belongs to the fields of controllable synthesis of nanometer materials, electronic information, biomedical engineering and other cross research fields, and specifically relates to a method for batch synthesis of green fluorescent nanometer carbon clusters. Background technique [0002] Carbon nanomaterials are a class of nanomaterials mainly composed of carbon elements, including one-dimensional carbon nanotubes, two-dimensional graphene, graphyne, and zero-dimensional nanodiamonds, fullerenes, carbon dots, etc., which have excellent electronic, Optical properties and other properties have been widely used in photodiodes, photoelectric conversion, solar cells and biomedicine, and have achieved great success. As a new member of the family: carbon dots (carbon quantum dots), with good optical stability, photobleaching resistance and good biological safety, etc., are used to develop new biological imaging probes, high-performance nanosensors...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C01B32/15
CPCB82Y20/00B82Y40/00C09K11/65
Inventor 沈广霞王贤松胡美昕崔大祥
Owner SHANGHAI JIAO TONG UNIV
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