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Preparation method of electronegative monolayer graphene

A single-layer graphene, electronegative technology, which is applied in the field of preparation of negatively charged single-layer graphene, can solve the problems of high toxicity of organic solvents, poor biocompatibility, high price, etc. The method is simple, low-cost, and easy to promote Effect

Active Publication Date: 2016-03-30
天之草空间科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, organic solvents are highly toxic, expensive, difficult to separate, and poor in biocompatibility, etc.

Method used

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  • Preparation method of electronegative monolayer graphene
  • Preparation method of electronegative monolayer graphene
  • Preparation method of electronegative monolayer graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Preparation of low carbon to oxygen ratio graphene quantum dot solution

[0036] Using 1,3,6-trinitropyrene as a carbon source, 1,3,6-trinitropyrene was synthesized by hydrothermal method after ultrasonication in sodium hydroxide solution. Among them, the concentration of 1,3,6-trinitropyrene is 5.0 mg / mL, the concentration of sodium hydroxide solution is 0.3 mol / L, the ultrasonic time is 4 hours, the hydrothermal synthesis conditions are 200 ° C, 4 hours, the solution volume Account for 40% of the volume of the hydrothermal kettle. The graphene quantum dot solution is the solution obtained by hydrothermal synthesis. First, it is fully dialyzed with a dialysis bag with a molecular weight cut-off of 1000 Da, and then the solution in the dialysis bag is collected. Elemental analysis and characterization showed that the carbon and oxygen atomic content ratio was 1.5:1.

[0037] 2. Preparation of single-layer graphene

[0038] Graphite with a particle size of 80 mesh ...

Embodiment 2

[0052] 1. Preparation of low carbon to oxygen ratio graphene quantum dot solution

[0053] Using 1,3,6-trinitropyrene as a carbon source, 1,3,6-trinitropyrene was synthesized by hydrothermal method after ultrasonication in sodium hydroxide solution. Among them, the concentration of 1,3,6-trinitropyrene is 1.0 mg / mL, the concentration of sodium hydroxide solution is 0.5 mol / L, the ultrasonic time is 3 hours, the hydrothermal synthesis conditions are 180°C and 8 hours, the solution volume Account for 30% of the volume of the hydrothermal kettle. The graphene quantum dot solution is obtained by hydrothermal synthesis, after fully dialysis with a dialysis bag with a molecular weight cut-off of 1000Da, the solution in the dialysis bag is collected, and then the gained solution is placed in a 3500Da dialysis bag for sufficient dialysis, and then freeze-dried . Elemental analysis and characterization show that the ratio of carbon and oxygen atoms is 1.2:1.

[0054] 2. Preparation ...

Embodiment 3

[0061] 1. Preparation of low carbon to oxygen ratio graphene quantum dot solution

[0062] Using 1,3,6-trinitropyrene as a carbon source, 1,3,6-trinitropyrene was synthesized by hydrothermal method after ultrasonication in sodium hydroxide solution. Among them, the concentration of 1,3,6-trinitropyrene is 3.0 mg / mL, the concentration of sodium hydroxide solution is 1.0 mol / L, the ultrasonic time is 4 hours, the hydrothermal synthesis conditions are 190°C and 6 hours, the solution volume Account for 25% of the volume of the hydrothermal kettle. The graphene quantum dot solution is obtained by hydrothermal synthesis, after fully dialysis with a dialysis bag with a molecular weight cut-off of 1000Da, the solution in the dialysis bag is collected, and then the gained solution is placed in a 3500Da dialysis bag for sufficient dialysis, and then freeze-dried . Elemental analysis and characterization showed that the carbon and oxygen atomic content ratio was 1.8:1.

[0063] 2. Pre...

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Abstract

The invention discloses a preparation method of electronegative monolayer graphene. In the preparation method, graphite is taken as a raw material, water is taken as a dispersant, exfoliation of graphite is realized under assist of graphene quantum dot via mechanical exfoliation so as to obtain the electronegative monolayer graphene, wherein the carbon / hydrogen ratio of the graphene quantum dot ranges from 1.2:1 to 1.8:1. The electronegative monolayer graphene prepared via the above preparation method possesses a single layer structure and excellent electrical conductivity, and excellent water dispersibility at a pH value ranging from 2 to 12, and is negatively charged; the preparation method is simple, and is convenient to popularize; and cost is low.

Description

technical field [0001] The invention belongs to the technical field of new materials, in particular to a method for preparing negatively charged single-layer graphene. Background technique [0002] Graphene (single-layer graphene, graphene) is a new type of carbon material, produced by sp 2 The hybridized carbon atoms are bonded in a hexagonal lattice with a single-layer, two-dimensional honeycomb crystal structure. When the graphite sheet is peeled off into a single layer, the single layer with a thickness of only one carbon atom is graphene. Although some researchers currently refer to graphite flakes with less than 10 layers as graphene, in a strict sense, graphene is "a carbon flake with only one layer of carbon atoms thick", that is, single-layer graphene. Single-layer graphene has excellent electrical and optical properties, mechanical properties, thermal conductivity and extremely high charge carrier mobility, as well as excellent mechanical strength and flexibility...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y40/00B82Y20/00
CPCC01B2204/02C01B2204/22C01P2004/04C01P2004/01C01P2002/84C01P2006/40C01P2006/60
Inventor 奚凤娜沈超许枭然周璘
Owner 天之草空间科技有限公司
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