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Method for preparing graphene quantum dots with controllable fluorescence color by chemical modification

A technology of graphene quantum dots and chemical modification, applied in chemical instruments and methods, luminescent materials, etc., can solve the problem of single and non-adjustable color

Active Publication Date: 2014-03-19
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method capable of regulating and controlling the fluorescent emission of graphene quantum dots by means of surface chemical modification in view of the disadvantage that the fluorescence color of graphene quantum dots is single and cannot be adjusted.

Method used

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  • Method for preparing graphene quantum dots with controllable fluorescence color by chemical modification
  • Method for preparing graphene quantum dots with controllable fluorescence color by chemical modification
  • Method for preparing graphene quantum dots with controllable fluorescence color by chemical modification

Examples

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Embodiment 1

[0024] 1: Preparation of green fluorescent graphene quantum dots (GQDs)

[0025] Disperse 100 mg of graphene oxide powder into 10 ml of N,N-dimethylformamide (DMF), disperse the dispersion liquid ultrasonically (120W, 100kHz), and then transfer it to a polytetrafluoroethylene reactor, at 200°C The reaction was carried out under the conditions for 10 hours; after the reaction, the supernatant was taken and dried by rotary evaporation, so as to obtain dry graphene quantum dots. The obtained dry graphene quantum dots are subjected to two-step gradient column chromatography, the stationary phase is silica gel, and the developer of the first step gradient column chromatography is a mixed solution of dichloromethane and methanol, and the volume ratio of the two is 2 : 1, the developer of the second step gradient column chromatography is deionized water; in the second phase elution, green fluorescent graphene quantum dots (GQDs) were obtained with a mass of 0.752 mg.

[0026] 2: Met...

Embodiment 2

[0035] 1: Preparation of green fluorescent graphene quantum dots (GQDs)

[0036] Disperse 50 mg of graphene oxide powder into 10 ml of N,N-dimethylformamide (DMF), disperse the dispersion liquid ultrasonically (120W, 100kHz), and then transfer it to a polytetrafluoroethylene reactor. The reaction was carried out under the conditions for 20 hours; after the reaction, the supernatant was taken and dried by rotary evaporation, so as to obtain dry graphene quantum dots. The obtained dry graphene quantum dots are subjected to two-step gradient column chromatography, the stationary phase is silica gel, and the developer of the first step gradient column chromatography is a mixed solution of dichloromethane and methanol, and the volume ratio of the two is 3 : 1, the developer of the second step gradient column chromatography is deionized water; in the second phase elution, green fluorescent graphene quantum dots (GQDs) were obtained with a mass of 0.545 mg.

[0037] 2: Ethylamine mo...

Embodiment 3

[0042] 1: Preparation of green fluorescent graphene quantum dots (GQDs)

[0043] The preparation method of green fluorescent graphene quantum dots is the same as that of Example 1, except that the content of graphene oxide powder is changed to 200 mg, dispersed in 10 ml of N,N-dimethylformamide, and reacted at 300°C for 5 hours. The resulting green fluorescent graphene quantum dots (GQDs) have a mass of 1.278 mg.

[0044] 2: N-propylamine modification of green fluorescent graphene quantum dots

[0045] Add 500 microliters of 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC-HCl) and N-hydroxysuccinimide (NHS) mixed aqueous solution, the content of EDC-HCl is 10 mmol, and the content of NHS is 5 mmol. Then the reaction system was stirred at room temperature (25° C.) for 0.5 hours. Subsequently, 40 microliters of n-propylamine was added and stirred at room temperature (25 degrees Celsius) for 4 hours. Finally, it was stirred at 100° C. for 4 hours. The graphen...

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Abstract

The invention belongs to the technical field of graphene quantum dots, and particularly relates to a method for preparing graphene quantum dots with controllable fluorescence color by chemical modification. The technical scheme is as follows: the method comprises the following steps: 1. preparing green-fluorescence graphene quantum dots; 2. carrying out chemical grafting on the green-fluorescence graphene quantum dots to achieve the goal of regulating and controlling fluorescence; and 3. carrying out chemical reduction on the green-fluorescence graphene quantum dots to achieve the goal of regulating and controlling fluorescence. The experimental method of surface chemistry regulation and control can effectively regulate and control the fluorescence emission of the graphene quantum dots, and has significant instruction meanings for understanding the fluorescence mechanism. By using the up-conversion fluorescence property of the graphene quantum dots, the graphene quantum dots can be used in the field of two-photon biological imaging; and the technique can reduce the damage of ultraviolet excitation on the organisms in the traditional fluorescent substance imaging process.

Description

technical field [0001] The invention belongs to the technical field of graphene quantum dots, and in particular relates to a method for preparing graphene quantum dots with controllable fluorescent color by a chemical modification method. Background technique [0002] Carbon-based fluorescent materials (including carbon dots, nanodiamonds, fluorescent carbon nanotubes, fullerenes and emerging fluorescent graphene) have received widespread attention. They have down-conversion and up-conversion fluorescence properties, chemical stability, good biocompatibility and low toxicity; they have broad application prospects in biological imaging, medical diagnosis, catalysis and photovoltaic devices. Fluorescent graphene materials usually have a sheet structure of less than 5 layers. Due to the relatively simple single-layer structure, it is a bridge connecting other fluorescent carbon materials and can be used as a model system for research and exploration of unknown properties, fluor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65C09K11/02
Inventor 杨柏朱守俊张俊虎宋玉彬刘学
Owner JILIN UNIV