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Supersonic chemical preparation method for grapheme quantum dots

A graphene quantum dot and ultrasonic technology, applied in the field of graphene quantum dots, can solve the problems of difficult modulation of optical and electrical properties, difficult opening of graphene energy band, graphene confinement, etc., and achieves remarkable quantum confinement effect and excellent luminescence. Effects of Features

Inactive Publication Date: 2011-10-26
KUNMING INST OF PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] What the present invention is to solve is that the graphene energy band is not easy to open, its optical and electrical properties are not easy to modulate, and graphene has semi-metallic properties that limit the application of graphene in optoelectronic materials. It provides a combination of ultrasonic waves and dispersants The method for preparing monodisperse graphene quantum dot material

Method used

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  • Supersonic chemical preparation method for grapheme quantum dots
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Examples

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Embodiment 1

[0036] Example 1: 1.8 mg of carbon black was weighed, 8 ml of N-methylpyrrolidone was added thereto, sealed, and ultrasound was performed for 2 hours at 99W ultrasonic power. Then, centrifuge at 3000 rpm for 10 minutes to obtain graphene quantum dots with an average size of 2.5 nm.

Embodiment 2

[0037] Example 2: 1.2 mg of graphite powder was weighed, 3 ml of N-methylpyrrolidone was added thereto, sealed, and ultrasound was performed for 6 hours at 99W or 50W ultrasonic power. Then centrifuge at 10,000 or 12,000 rpm for 60 or 80 minutes to obtain graphene quantum dots with an average size of 2.7 nm.

Embodiment 3

[0038] Example 3: Weigh 1.5 mg of carbon black, add 6 ml of 1,3-dimethyl-2-imidazolidinone into it, seal it, and perform ultrasonication at 99W ultrasonic power for 2 hours. Then, centrifuge at 10,000 rpm for 60 or 80 minutes to obtain graphene quantum dots.

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Abstract

A supersonic chemical preparation method for grapheme quantum dots relates to a preparation method for grapheme quantum dots, and especially relates to a method for preparing a grapheme quantum dot solution with the characteristics of good monodispersity and luminescence performance using a simple and environmentally friendly process with cheap carbon black or graphite powder as the raw material. The preparation method provided in the invention is characterized by adding a dispersant into carbon black or graphite and obtaining grapheme quantum dots under the action of supersonic wave. The grapheme quantum dot solution prepared in the invention has the characteristics of luminescence, monodispersion, water-solubility, etc.

Description

technical field [0001] The invention relates to a method for preparing graphene quantum dots, in particular to a method for preparing graphene quantum dots with good monodispersity and luminescent properties by using cheap carbon black or graphite powder as raw materials and using a simple and environmentally friendly process. Background technique [0002] Graphene is a carbon atom with sp 2 A two-dimensional flat film with a hexagonal honeycomb lattice structure with a bond length of 0.142nm in a hybrid form. It has special electrical, optical, thermal and mechanical properties, and has important potential value in the application of transistors, single-molecule gas detection, integrated circuits, transparent conductive electrodes, biological devices, supercapacitors and electromechanical couplers. At present, it can be prepared by tape stripping method, chemical vapor deposition method, SiC heating method, graphene oxide reduction method and other methods. These preparati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y40/00B01J19/10
Inventor 唐利斌刘树平陆志文姬荣斌宋立媛陈雪梅马钰王忆锋庄继胜
Owner KUNMING INST OF PHYSICS
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