Preparation method of graphene dispersion liquid, and preparation method of graphene film

A technology of graphene dispersion liquid and graphene film, which is applied in the field of materials, can solve problems such as limited application, influence of electronic properties, and damage to the integrity of graphene electronic structure, and achieve low cost, high controllability, and good flexibility. Effect

Active Publication Date: 2013-12-25
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Application Information

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Problems solved by technology

Although the graphite oxide reduction method can prepare a large amount of graphene at a relatively low cost, the electronic structure and crystal integrity of graphene are severely damaged by strong oxidants, which affect its electronic properties and limit its Its application in device

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  • Preparation method of graphene dispersion liquid, and preparation method of graphene film
  • Preparation method of graphene dispersion liquid, and preparation method of graphene film
  • Preparation method of graphene dispersion liquid, and preparation method of graphene film

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preparation example Construction

[0029] As mentioned above, the present invention provides a kind of preparation method of graphene dispersion liquid in order to solve the problem existing in the prior art, refer to figure 1 , the method includes the steps: S101, preparing graphene precursor: using expanded graphite to press the electrode formed as the anode, metal or non-metal electrode material as the cathode; the anode and the cathode are placed in the electrolyte solution, and the anode Apply a voltage of 1-20V and / or a density of 1-200mA / cm between the cathode and the cathode 2 Electrochemical reaction is carried out for 1 to 120 minutes with an electric current, and the anode product in the reaction is the graphene precursor; S102, dispersed graphene precursor: after the graphene precursor is washed, it is added to a dispersant to disperse to obtain the graphene precursor Graphene dispersion. Another aspect of the present invention provides a kind of preparation method of graphene film, such as figure...

Embodiment 1

[0033] Step A: Press 400 mg of expanded graphite into a sheet with a diameter of 1 to 2 cm under a pressure of 20 MPa, and use Ag glue to connect the expanded graphite sheet with a copper wire to form an electrode as an anode; use a platinum sheet as a cathode. The anode and cathode were placed in a sulfuric acid aqueous solution with a concentration of 10mol / L and 10ml, and the constant voltage was adjusted to 2V to perform anodic oxidation on the expanded graphite, and the electrolytic reaction time was 30min. The interlayer of graphene is widened during the oxidation reaction of the anode to generate oxygen. At the same time, the sulfate ions adsorbed around the anode are intercalated into the interlayer of graphene. Large; finally, the product obtained from the anode after the electrolysis reaction is a graphene precursor.

[0034] Step B: washing the graphene precursor with distilled water to remove impurities adsorbed on the surface, and then freeze-drying. Take 80 mg o...

Embodiment 2

[0041] Step A: Press 500 mg of expanded graphite into a sheet with a diameter of 2 to 3 cm under a pressure of 30 MPa, and use Ag glue to connect the expanded graphite sheet with a copper wire to form an electrode as an anode; use a platinum sheet as a cathode. The anode and cathode are placed in a sulfuric acid aqueous solution with a concentration of 10mol / L and 10ml, and the applied current is adjusted to be 20mA / cm 2 Under conditions, the expanded graphite is subjected to anodic oxidation, the electrolysis reaction time is 60 minutes, and the product obtained from the anode is a graphene precursor.

[0042] Step B1: washing the graphene precursor with distilled water to remove impurities adsorbed on the surface, and then freeze-drying. Take 50 mg of the washed graphene precursor and add it to 30 mL of ethanol / water (volume ratio 1:1) mixed solution, ultrasonically strip it for 30 min, and centrifuge at a speed of 3000 rpm to obtain a concentration of 1 mg / mL Graphene disp...

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Abstract

The invention discloses a preparation method of a graphene dispersion liquid. The preparation method of the graphene dispersion liquid comprises the following steps: placing an expanded graphite compacted electrode and a metallic or non-metallic electrode material in an electrolyte solution as an anode and a cathode respectively, and applying a voltage of 1-20V and/or a current having a density of 1-200mA/cm<2> between the anode and the cathode for carrying out an electrochemical reaction for 1-120min; and washing an anode product obtained after the electrochemical reaction, adding to a dispersant, and carrying out ultrasonic or/and mechanical stirring dispersion to obtain the graphene dispersion liquid. The invention also discloses a preparation method of a graphene film. The graphene dispersion liquid forms the graphene film on a substrate in a filter film forming mode or a coating film forming mode or a natural deposition mode. The preparation methods have the advantages of simple process, easy operation, high controllability, low cost and mild reaction condition, and are suitable for the industrialized large-scale production.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a preparation method of a graphene material, in particular to a preparation method of a graphene dispersion liquid and a preparation method of a graphene film. Background technique [0002] Graphene is another major discovery in the field of carbon materials after fullerene and carbon nanotubes. Graphene is composed of single layer sp 2 A honeycomb hexagonal planar two-dimensional crystal formed by the arrangement of hybridized carbon atoms. Graphene has a large specific surface area, good electrical and thermal conductivity, and high carrier mobility. These excellent properties make graphene have great potential application prospects in optoelectronic devices, chemical power sources (such as solar cells, lithium-ion batteries), gas sensors, catalysts and drug carriers, antistatic and heat dissipation materials, etc. [0003] Graphene sheets are prone to aggregation or re-stac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C08L81/06C08L33/12C08K3/04C08J5/18B82Y30/00C01B32/182C01B32/19
Inventor 刘立伟吴丽琼李伟伟邱胜强高嵩廖书田
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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