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Film containing graphene and/or graphene oxide, and preparation method thereof

A technology of graphene and thin film, which is applied in the field of thin film containing graphene and/or graphene oxide and its preparation, which can solve the problems of harsh solution requirements and waste of solution, and achieve the effect of fast preparation speed and saving solution

Inactive Publication Date: 2013-04-17
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The spin coating method is a method commonly used in the laboratory to prepare thin films. The preparation is relatively simple, but the disadvantage of this method is that a large amount of solution is wasted. At the same time, due to the centrifugal force of the spin coating, the thickness of the prepared film is in a certain distribution. , the requirements for the solution are more stringent
But so far there is no report of using this method to prepare graphene films and graphene composite films.

Method used

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  • Film containing graphene and/or graphene oxide, and preparation method thereof
  • Film containing graphene and/or graphene oxide, and preparation method thereof
  • Film containing graphene and/or graphene oxide, and preparation method thereof

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preparation example Construction

[0012] The invention provides a kind of preparation method that contains the thin film of graphene and / or graphene oxide, the method comprises the following steps: (1) graphene and / or graphene oxide sol is dispersed in solvent and is formulated into graphene and / or Or graphene oxide concentration is the dispersion liquid containing graphene and / or graphene oxide of 0.01-20mg / ml; (2) adopt wire bar coating method to make dispersion liquid form uniform wet film on the substrate, wherein said wire The wire diameter of the wire rod used in the rod coating method is 0.01-2mm; (3) volatilize the solvent in the wet film obtained in the step (2).

[0013] According to the present invention, the solvent can be deionized water and / or an organic solvent, and the organic solvent can be various organic solvents that can dissolve graphene and / or graphene oxide sol and are volatile, for example, it can be deionized In water, ethanol, methanol, acetone, ether, dimethyl ether, ethylene glycol,...

preparation example 1

[0036] Treat natural graphite powder (1 part by mass) with concentrated sulfuric acid (30 parts by mass) and potassium permanganate (3 parts by mass) in an ice bath for 3 hours, raise the temperature to about 35°C, keep it for 30 minutes, and keep it at 95°C 45 parts by mass of water were added, and after 15 minutes of reaction, 3.5 parts by mass of 30% by weight hydrogen peroxide and 26.5 parts by mass of water were added to obtain a bright yellow suspension. Filter the suspension, wash the filter cake 3 times with 3% by weight hydrochloric acid, dry the obtained filter cake at 60°C, disperse the obtained filter cake in water to obtain a graphene oxide sol, centrifuge the sol, and redisperse After multiple treatments (generally more than 3 times), a relatively pure graphene oxide sol (wherein the content of graphene oxide is 20 mg / ml by weight %) is obtained, which is used to prepare a film containing graphene oxide.

preparation example 2

[0038] Add heat-expandable graphite powder or microcrystalline graphite or natural graphite (1 part by mass) to N-methylpyrrolidone solvent (1000 parts), and sonicate for 30 minutes in a 300w power ultrasonic instrument. The obtained dispersion was centrifuged at 500 rpm for 60 min using a centrifuge. The thick graphite flakes at the bottom were discarded to obtain a gray sol in the upper layer. The gray sol in the upper layer was centrifuged at a speed of 5000 rpm, and a black graphene sol (wherein the content of graphene was 1 mg / ml by weight %) was obtained at the bottom, which was used to prepare a graphene-containing film.

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Abstract

The invention provides a film containing graphene and / or graphene oxide, and a preparation method thereof. The method comprises the following steps of (1) dispersing a graphene and / or graphene oxide gel in a solvent to prepare a dispersing solution containing the graphene and / or graphene oxide with a concentration of 0.01-20 mg / mL; (2) making the dispersing solution form a uniform wet film on a substrate by a wire rod coating method, wherein the diameter of the wire used in the wire rod coating method is 0.01-2 mm; and (3) evaporating solvent from the wet film obtained from the step (2). The invention also provides a film containing the graphene and / or graphene oxide with a thickness of 0.6-2,300 nm, and the thickness deviation of the film is smaller than or equal to 37%. The preparation method provided by the invention has the advantages of fast preparation speed and solution economization.

Description

technical field [0001] The invention relates to a film containing graphene and / or graphene oxide and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional planar monoatomic layer of hexagonally arranged carbon atoms, which has excellent properties such as high charge mobility, high mechanical strength, and high surface area. It has a wide range of applications in thin film solar cells, flat panel display electrodes, capacitors, lithium batteries, and mechanical strength enhancement of coatings. [0003] At present, the preparation methods of graphene or graphene oxide film mainly include drop coating method, spin coating method, microfiltration, self-assembly, LB film method, and spray coating method. The drop-coating method and microfiltration method can only prepare graphene membranes with a small area. The spin coating method is a method commonly used in the laboratory to prepare thin films. The preparation is relatively simple, but t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y40/00C01B32/184C01B32/198
Inventor 智林杰王杰方岩何海勇邱腾飞王斌罗彬梁明会张先锋
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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