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Methods for preparing large-area graphene film and large-area graphene composite films

A graphene film, large-area technology, applied in graphene, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problems of high preparation cost, long suction filtration time, inconvenience, etc. The effect of flexibility and flatness, no pollution to the environment, and easy manipulation

Inactive Publication Date: 2013-08-28
卫辉市卓力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods used to prepare graphene films mainly include spin coating, spray coating, suction filtration, and chemical vapor deposition (CVD), among which spin coating is a commonly used operation method in laboratories, and can only prepare small-area graphene films. Graphene film, and the thickness distribution of the prepared film is uneven, and the requirements for the solution are relatively harsh; although the spraying method can prepare a large-area graphene film, the operation steps are complicated and the preparation cost is relatively high, which is not conducive to large-scale The industrial production of the suction filtration method also faces the problems of long suction filtration time, limited film area by the device, and difficulty in large-scale preparation; for the chemical vapor deposition method, although a large-area graphene film can be synthesized, a metal catalyst layer must be used. Graphene films are synthesized on metal catalyzed substrates, and the synthesis temperature is generally above 650°C. In practice, the large-area graphene films synthesized on metal substrates must be transferred to other substrates before they can be used, resulting in a corresponding Inconvenience in actual production

Method used

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  • Methods for preparing large-area graphene film and large-area graphene composite films

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Pour 150ml of graphene oxide aqueous solution with a mass concentration of 5mg / ml on flat commercial A4 printing paper, use a stainless steel rod rolling method to make the graphene oxide solution flow and form a layer of uniform coverage on the entire surface of the printing paper. Film layer, and then naturally dry and solidify at room temperature;

[0032] At room temperature, the printing paper bearing the graphene oxide film layer is soaked in hydrochloric acid with a molar concentration of 1 mol / L. The graphene oxide film layer will be easily peeled off from the printing paper in minutes, and an A4-sized graphene oxide film can be obtained after drying; this film has good flexibility and can be curled at will;

[0033] Then, the graphene oxide film can be soaked again at room temperature in 45% hydroiodic acid to perform a reduction reaction, thereby obtaining the desired graphene film product.

Embodiment 2

[0035] Pour 150ml of graphene oxide aqueous solution with a mass concentration of 10mg / ml on flat commercial A4 printing paper, use a stainless steel rod rolling method to make the graphene oxide solution flow and form a layer of uniform covering film on the entire surface of the printing paper layer, and then naturally dry and solidify at room temperature;

[0036]At room temperature, the printing paper bearing the graphene oxide film layer is soaked in acetic acid with a molar concentration of 0.5mol / L. The graphene oxide film layer will be easily peeled off from the printing paper in 10 minutes, and an A4-sized graphene oxide film can be obtained after drying; this film has good flexibility and can be curled at will;

[0037] Then, the graphene oxide film can be soaked again at room temperature in 50% hydroiodic acid to perform a reduction reaction, thereby obtaining the desired graphene film product.

Embodiment 3

[0039] Pour 300ml of graphene oxide aqueous solution with a mass concentration of 0.1mg / ml on a flat drawing paper with a specification of 35cm*35cm, use a stainless steel rod rolling method to make it flow and form a layer of uniform coverage on the entire surface of the drawing paper film layer, and then carry out drying and curing treatment;

[0040] At room temperature, the drawing paper bearing the graphene oxide film layer is directly immersed in 55% hydroiodic acid to perform the reduction reaction. During the reduction process, the drawing paper is hydrolyzed and reacts with hydroiodic acid to generate bubbles. This impels the graphene film layer to break away from the drawing paper automatically, and obtains the desired large-area graphene film product. The cross-sectional SEM image of the prepared large-area graphene film is shown in figure 1 shown.

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Abstract

The invention discloses a method for preparing a large-area graphene film. The method comprises the following steps of pouring a graphene oxide aqueous solution on a paper base material to obtain a uniformly-covering graphene oxide film, carrying out drying curing treatment, and dipping the paper base material with the graphene oxide film into hydroiodic acid for a reduction reaction, wherein in the reduction reaction, the paper base material is hydrolyzed under the acidic condition and simultaneously, reacts with an acid to produce bubbles so that the graphene oxide film is automatically separated from the paper base material and the large-area graphene film product is obtained. The invention also discloses a method for preparing the graphene film or large-area graphene composite films. The methods can realize graphene reduction without a high-temperature or a toxic reduction reagent, can conveniently and fast realize film stripping to produce large-area film products and are suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of graphene preparation, and more specifically relates to a method for preparing large-area graphene and its composite film. Background technique [0002] With the development of modern technology, in order to meet the design and power requirements of flexible and portable electronic devices (such as rollable displays, wearable electronics, etc.), making ultra-light, flexible and safe energy storage devices is becoming a research hotspot. . As a new type of carbon material, graphene film is expected to be used in many fields such as energy storage due to its large specific surface area, high mechanical properties, excellent electron transport ability, relatively inert electrochemical properties and low cost. widely used. [0003] At present, the methods used to prepare graphene films mainly include spin coating, spray coating, suction filtration, and chemical vapor deposition (CVD), among which spin coatin...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B31/02B82Y30/00C08J5/18C08L79/04C08L79/02C08K3/04C08K9/02C01B32/168C01B32/19
Inventor 王帅杨圣雄张哲野
Owner 卫辉市卓力科技有限公司
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