Transparent graphene conductive thin film and preparation method thereof

A technology of transparent conductive film and graphene film, which is applied in the direction of cable/conductor manufacturing, conductor, circuit, etc., can solve the problems of limited light transmittance, high cost of ITO, scarce indium content, etc., and achieves low cost and simple preparation method , the effect of large preparation area

Active Publication Date: 2012-10-24
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has the following disadvantages: the content of indium on the earth is very scarce, and the annual output is less than 500 tons, and it needs to be extracted from zinc-lead ore, resulting in high cost of ITO; in acidic and alkaline environments, the metal ions of ITO tend to Diffuses into the polymer layer, making it very unstable with limited transmission of light in the near-infrared region

Method used

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preparation example Construction

[0016] The preparation method of graphene transparent conductive film of the present invention, adopt graphite oxide, disperse, prepare graphene oxide film, reduction, comprise the following steps:

[0017] 1. Graphite oxide, according to the mass ratio of graphite powder, anhydrous sodium nitrate, and strong oxidant 1:0.5:3-6, add graphite powder and anhydrous sodium nitrate into a strong acid solution with an ice bath temperature of ≤0°C, The amount of strong acid solution is 1g of graphite powder, add 20~50ml, stir at 30~600rpm for 30~60 minutes, then add strong oxidant, continue stirring for 2h, control the reaction temperature not to exceed 10°C, and obtain a suspension. The temperature was raised to 30-40°C and the reaction was stirred for 3h. Then add deionized water, increase the temperature of the reactant to 96±1°C, react for 1h, and then add 30% H 2 o 2 , the suspension becomes precipitate and bright yellow liquid, the precipitate is filtered, fully washed with de...

Embodiment 1

[0050] 1. At room temperature, put 200ml of concentrated sulfuric acid solution with a concentration of 98% in a container, control the temperature in an ice bath at 0°C, add 10g of natural flake graphite and 5g of sodium nitrate, control the stirring speed at 600rpm, stir for 30min, and then add Slowly add 30g strong oxidizing agent KMnO 4 , continue to stir for 2h, control the reaction temperature at no more than 10°C, and obtain a suspension. The temperature was raised to 35°C and the reaction was stirred for 3h. Add deionized water, increase the temperature of the reactant to 96±1°C, react for 1h, dilute the reactant solution with deionized water, and then add H with a volume concentration of 30%. 2 o 2 , filter the precipitate while hot, wash the precipitate with deionized water until there is no SO in the filtrate 4 2 -, vacuum dehydration to obtain graphite oxide filter cake.

[0051] 2. Disperse the graphite oxide filter cake in water, and use weak ultrasonic wave...

Embodiment 2

[0055] 1. At room temperature, put 300ml of concentrated sulfuric acid solution with a concentration of 70% in a container, control the temperature in an ice bath at 0°C, add 10g of natural flake graphite and 0.5g of sodium nitrate, control the stirring speed at 600rpm, stir for 30min, and then add Slowly add 60g strong oxidant KMnO 4 , continue to stir for 2h, control the reaction temperature at no more than 10°C, and obtain a suspension. The temperature was raised to 35°C and the reaction was stirred for 3h. Add deionized water, increase the temperature of the reactant to 96±1°C, react for 1h, dilute the reactant solution with deionized water, and then add H with a volume concentration of 30%. 2 o 2 , filter the precipitate while hot, wash the precipitate with deionized water until there is no SO in the filtrate 4 2 -, vacuum dehydration to obtain graphite oxide filter cake.

[0056]2. Disperse the graphite oxide filter cake in water, and use weak ultrasonic waves to pe...

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Abstract

The invention discloses a transparent graphene conductive thin film and a preparation method of the film, aiming at improving the acid and alkali resistance of a transparent conductive thin film. The transparent graphene conductive thin film is a graphene thin film with the thickness of 1-50nm and the electrical conductivity of 300-800S/cm, and has the light transmittance of 70-85% for light with the wavelength within the range of 200-1100nm. The preparation method of the transparent graphene conductive thin film comprises the steps of: oxidizing graphite, preparing a graphene oxide water mixed liquid, preparing a graphene oxide thin film, and reducing to obtain the transparent graphene conductive thin film. Compared with the prior art, the transparent graphene conductive thin film which is prepared by a high-temperature reduction or chemical reduction method has the advantages of being good in light transmittance and electrical conductivity, large in preparation area, simple in preparation method and low in cost; and the transparent graphene conductive thin film can be used for replacing the traditional inorganic oxide electrode material indium tin oxide (ITO), thus providing infinite space for the transparent conductive thin film and the related fields.

Description

technical field [0001] The invention relates to a transparent conductive film and a preparation method thereof, in particular to a graphene-based transparent conductive film and a preparation method thereof. technical background [0002] Transparent conductive films are currently used in a wide range of applications, such as transparent electrodes for solar cells and conductive glass for touch screens. The more mature material used to make transparent conductive films is indium tin oxide (ITO). However, it has the following disadvantages: the content of indium on the earth is very scarce, and the annual output is less than 500 tons, and it needs to be extracted from zinc-lead ore, resulting in high cost of ITO; in acidic and alkaline environments, the metal ions of ITO tend to Diffusion into the polymer layer makes it very unstable and has limited transmission of light in the near-infrared region. Contents of the invention [0003] The purpose of the invention is to prov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/04H01B5/00H01B13/00
Inventor 梁奇梅佳陈冠雄吕雪孔东亮
Owner BTR NEW MATERIAL GRP CO LTD
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