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Hydrothermal method for preparing water-soluble graphene quantum dots

A graphene quantum dot and water-soluble technology, which is applied in the direction of nanotechnology, can solve the problems of difficult modulation of optical and electrical properties, difficult opening of energy bands, and non-semiconductor properties, etc., to achieve cheap raw material sources, easy mass production, and process The effect of environmental protection

Active Publication Date: 2011-09-21
KUNMING INST OF PHYSICS
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Problems solved by technology

[0005] The present invention solves the current problems that the energy band of graphene is not easy to open, does not have semiconductor properties, and the optical and electrical properties are not easy to modulate, etc., and prepares water-soluble graphene quantum with controllable size by means of the shrinkage polymerization reaction of sugar molecules under hydrothermal conditions. point

Method used

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  • Hydrothermal method for preparing water-soluble graphene quantum dots
  • Hydrothermal method for preparing water-soluble graphene quantum dots
  • Hydrothermal method for preparing water-soluble graphene quantum dots

Examples

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Embodiment 1

[0023] Embodiment 1: prepare 0.5M glucose aqueous solution, add 40ml solution in the polytetrafluoroethylene lining container of hydrothermal reactor, close the lid to form airtight space, put reactor into the furnace of 190 ℃, heat 120 minutes, That is, graphene quantum dots with an average size of 2.3 nm were obtained.

Embodiment 2

[0024] Example 2: prepare 0.01M sucrose aqueous solution, take 40ml of the solution in the reactor, close the lid tightly to form a closed space, put the reactor into a furnace at 220°C, and heat for 600 minutes. Graphene quantum dots with an average size of 4.3 nm were obtained.

Embodiment 3

[0025] Example 3: Prepare a 1.0 M fructose aqueous solution, put a certain volume of the solution in a reactor, close the lid tightly to form a closed space, put the reactor into a furnace at 150° C., and heat for 120 minutes. Graphene quantum dots with an average size of 3.8 nm were obtained.

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Abstract

The invention discloses a hydrothermal method for preparing water-soluble graphene quantum dots. The invention relates to the preparation method of graphene quantum dots, and especially relates to a hydrothermal method for preparing water-soluble graphene quantum dots. The method provided by the present invention is characterized in that: 0.01 to 1.0M of an aqueous solution of polyhydroxyl carbohydrate is added to a hydrothermal reaction vessel; the aqueous solution is heated for 10 to 600 minutes under a temperature of 120 to 220 DEG C; sugar molecules are polymerized into graphene quantum dots with sizes of 1 to 10nm, such that target products are obtained. The graphene quantum dots prepared with the method provided by the present invention has characteristics of water-solubility, monodispersity and special photoelectrical characteristics. The raw materials are cheap, and the sources of the raw materials are wide. With environmental-protective technology, the method is suitable for volume production.

Description

technical field [0001] The invention relates to a preparation technology of graphene quantum dots, in particular to a hydrothermal preparation technology of water-soluble graphene quantum dots. Background technique [0002] Graphene is a class of carbon-based materials, carbon atoms in sp 2 The hybrid form constitutes a two-dimensional planar film with a hexagonal honeycomb lattice structure with a bond length of 0.142nm. The preparation technologies of graphene mainly include tape stripping method, chemical vapor deposition method, SiC heating method, graphene oxide reduction method, etc. Each preparation technology has its own advantages and disadvantages, among which chemical vapor deposition method is currently the most important method for preparing large-area monolayers. The main technology of graphene. Since graphene is a special kind of carbon material, its special electrical, optical, thermal, and mechanical properties have been used in transistors, single-molecul...

Claims

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Application Information

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IPC IPC(8): C01B31/04B82Y40/00
Inventor 唐利斌姬荣斌宋立媛陈雪梅马钰王忆锋
Owner KUNMING INST OF PHYSICS
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