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Preparation method of graphene quantum dot powder with green fluorescence

A graphene quantum dot, green fluorescence technology, applied in graphene, chemical instruments and methods, luminescent materials, etc., can solve problems such as limiting potential applications, achieve industrialized mass production, overcome fluorescence quenching effect, and reduce agglomeration. Effect

Active Publication Date: 2020-11-24
QUANZHOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This property of graphene quantum dots greatly limits its potential applications in optoelectronic devices such as LEDs

Method used

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  • Preparation method of graphene quantum dot powder with green fluorescence
  • Preparation method of graphene quantum dot powder with green fluorescence
  • Preparation method of graphene quantum dot powder with green fluorescence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dissolve 4.508g (0.06mol) of thiourea in 100mL of ultrapure water, add 0.5g (0.0015mol) of 1,3,6-trinitropyrene, and then sonicate in a 500W ultrasonic pulverizer for 120 minutes to make the solution fully Mix, then transfer the mixed solution to a 200mL polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at 200°C for 10 hours; after the reaction solution is cooled to room temperature, use a 0.22μm nylon membrane for suction filtration, and then filter the filtrate with a 3500D The dialysis bag was dialyzed for 24 hours, and the concentration of the graphene quantum dot solution obtained outside the dialysis bag was adjusted to 0.1wt%, and it was set aside.

[0027] Dissolve 0.39g melamine and 0.56g paraformaldehyde in 15mL ultrapure water, then add 15mL, 0.1wt% graphene quantum dot solution, adjust the speed of the magnetic stirrer to 250r / min to make it fully mixed, and Heated in a water bath at 95°C for 40 minutes; after cooling, dried in a drying ov...

Embodiment 2

[0029] Dissolve 4.508g (0.06mol) of thiourea in 100mL of ultrapure water, add 0.4g (0.0012mol) of 1,3,6-trinitropyrene, and then sonicate in a 500W ultrasonic pulverizer for 30 minutes to make the solution fully Mix, then transfer the mixed solution to a 200mL polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at 190°C for 10 hours; after the reaction solution is cooled to room temperature, use a 0.22μm nylon membrane to perform suction filtration, and then filter the filtrate with a 3500D The dialysis bag was dialyzed for 18 hours, and the concentration of the graphene quantum dot solution obtained outside the dialysis bag was adjusted to 0.1wt%, and it was set aside.

[0030] Dissolve 0.39g melamine and 0.39g paraformaldehyde in 15mL ultrapure water, then add 15mL, 0.1wt% graphene quantum dot solution, adjust the speed of the magnetic stirrer to 250r / min to make it fully mixed, and Heated in a water bath at 85°C for 120 minutes; after cooling, dried in a dr...

Embodiment 3

[0032] Dissolve 4.508g (0.06mol) of thiourea in 100mL of ultrapure water, add 2.0g (0.006mol) of 1,3,6-trinitropyrene, and then ultrasonicate for 60 minutes in a 500W ultrasonic pulverizer to make the solution fully Mix, then transfer the mixed solution to a 200mL polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at 180°C for 12 hours; after the reaction solution is cooled to room temperature, use a 0.22μm nylon membrane for suction filtration, and then filter the filtrate with a 3500D The dialysis bag was dialyzed for 12 hours, and the concentration of the graphene quantum dot solution obtained outside the dialysis bag was adjusted to 0.1wt%, and it was set aside.

[0033] Dissolve 0.39g melamine and 1.56g paraformaldehyde in 15mL ultrapure water, then add 15mL, 0.1wt% graphene quantum dot solution, adjust the speed of the magnetic stirrer to 250r / min to make it fully mixed, and Heated in a water bath at 90°C for 60 minutes; after cooling, dried in a drying...

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Abstract

The invention discloses a preparation method of graphene quantum dot powder with green fluorescence. The preparation method comprises the following steps: with thiourea and 1,3,6-trinitropyrene as rawmaterials, carrying out a hydrothermal reaction to obtain a graphene quantum dot solution, mixing the graphene quantum dot solution with melamine and paraformaldehyde, and preparing the solid graphene quantum dot powder with green fluorescence by using a one-pot method. Compared with the prior art, the preparation method has the advantages that a prepolymer does not need to be prepared at first,and solid graphene quantum dots are directly prepared through the one-pot method, so preparation method can be simplified, preparation time can be shortened, and the prepared graphene quantum dot powder with green fluorescence has better fluorescence efficiency and can thus be used for preparing high-quality LED devices.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, in particular to a preparation method of green fluorescent graphene quantum dot powder. Background technique [0002] Graphene quantum dots (GQD) are quasi-zero-dimensional nanomaterials, and the movement of electrons in them is restricted in all directions, so the quantum confinement effect is particularly significant and has many unique properties. This could revolutionize the fields of electronics, optoelectronics and electromagnetism. Graphene quantum dot-based materials could make LED displays and solar cells cheaper to produce. The new GQD does not use any toxic metals (such as: cadmium, lead, etc.). Using GQD-based materials may make future OLED panels lighter, more flexible and less expensive. [0003] At present, the methods for synthesizing graphene quantum dots are mainly divided into two categories: top-down methods and bottom-up methods. The top-down approach involves usin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C09K11/65B82Y20/00B82Y40/00H01L33/50
CPCC01B32/184C09K11/65B82Y20/00B82Y40/00H01L33/502
Inventor 陈泽强张璐向斌崔旭东廖廷俤
Owner QUANZHOU NORMAL UNIV
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