Preparation method of self-support transparent conductive graphene film

A graphene film, transparent and conductive technology, applied in the field of nanomaterials, can solve the problems of uneven thickness of film materials, limit the transferability and processability of film materials, etc., and achieve simple steps, high light transmittance, and good flexibility. The effect of sex and conductivity

Inactive Publication Date: 2017-01-04
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the substrates of these methods cannot be removed, which severely limits the transferability and processability of the f

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh 5.00g graphite flakes and 3.75g NaNO 3 In a 1L beaker, stir, slowly add 160mL of concentrated sulfuric acid, stir for 0.5h, and slowly add 20g of KMnO 4 , 40min was added, and stirred into a paste; after continuing to stir for 20h, the solution was purple-red, mixed with a small amount of sequins; left for 5 days, during which time the reactants were occasionally stirred manually; slowly add 500mL of deionized water, and stir while adding ; Slowly add 30 mL H 2 O 2 , the color change is obvious at this time, a large number of bubbles emerge at this time, centrifuge, wash, collect the upper layer centrifuge, continue to add water to the lower layer sediment to disperse and centrifuge, collect the upper layer centrifuge, repeat this, combine the collected upper layer centrifuge, and then Dialysis is carried out with a dialysis bag with a molecular weight of 8000-14000 to obtain high-concentration graphene oxide, and the freeze-drying technology is used to dema...

Embodiment 2

[0038] Example 1 was repeated, the only difference being that different organic amine solutions were used for soaking, such as ethylamine, ethylenediamine or phenylenediamine.

[0039] It was found that in the case where only one layer of organic amine was sandwiched as in Example 1, the material would be damaged when immersed in ethylamine when the substrate was removed. will break.

Embodiment 3

[0041] Repeat Example 1, only the following differences: the number of layers of the prepared sandwich composite material (or called sandwich structure) is different, that is, on the basis of the single-layer sandwich structure of Example 1, continue to composite graphene oxide layer / melamine layer / graphene oxide layer to obtain a 2-layer, 3-layer and 4-layer sandwich structure material, wherein the 2-layer sandwich structure material includes 3 graphene oxide layers and 2 melamine layers sandwiched therein.

[0042] It was found that, whether it is the graphene oxide / melamine film IV, or the final graphene / melamine film product, the more layers, the greater the mechanical strength of the material.

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Abstract

The invention provides a preparation method of a self-support transparent conductive graphene film, comprising the following steps: pulling up a layer of graphene oxide A by using a filter membrane so as to obtain a material I; soaking the material I in an aqueous solution of organic amine so as to prepare a material II; pulling up a layer of graphene oxide B by using the material II so as to obtain a sandwich composite material; wetting the obtained sandwich composite material with an aqueous solution of acetone until the material is softened, and then soaking the material with acetone until the filter membrane is completely dissolved so as to obtain a material IV; and reducing graphene oxide in the material IV so as to obtain the self-support transparent conductive graphene film. According to the invention, organic amine is used, and a substrate is thoroughly removed by firstly wetting to play a 'perforating' role and then replacing a solvent system, so that the film can not be damaged easily in an operation process, integral steps are simple, the operation is easy, and the prepared film can be very large and thin and simultaneously has high light transmittance and favorable flexibility and conductibility.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a preparation method of a self-supporting transparent conductive graphene film. Background technique [0002] The traditional transparent electrode indium tin oxide (ITO) meets the requirements of the electrode for efficient transmission of light energy and conduction current, and has high light transmittance and low sheet resistance. The shortcoming that optoelectronic devices are easily damaged hinders the practical application in specific fields. [0003] Graphene is a special material with a hexagonal lattice composed of sp2 carbon atom hybrid orbitals arranged in a honeycomb lattice plane layered structure. It is the thinnest two-dimensional material found so far. As the most potential material to replace traditional transparent electrodes, graphene films can greatly reduce production costs in practical applications such as flat liquid crystal displays and transparent...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 从怀萍王郭飞秦海利
Owner HEFEI UNIV OF TECH
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