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Graphene-carbon nano composite transparent conducting thin film and preparation method thereof

A technology of transparent conductive film and composite film, applied in the direction of graphene, nano-carbon, nanotechnology, etc., can solve the problems of low degree of graphitization, poor flatness, limited performance of graphene film, etc., and achieve simple process and mild properties Effect

Inactive Publication Date: 2013-04-03
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the CVD method is too costly and unfavorable for large-scale production; most of the reagents used in the chemical reagent reduction treatment graphene oxide film method are poisonous or highly corrosive, such as hydrazine vapor, hydrogen iodide, etc., making the promotion of this method difficult. There are problems; and the performance of graphene films prepared by thermal reduction treatment of graphene oxide films is limited
In addition, the surface of pure graphene film is extremely prone to wrinkles and poor flatness, which limits the application of graphene film in some optoelectronic devices that require high flatness.
[0004] In addition, under the same substrate material, the graphene conductive film prepared by the above method has a high degree of graphitization, that is, good electrical conductivity, and the light transmittance will decrease accordingly. When the light transmittance (550nm) is 85%, graphite The degree of oxidation is low and the surface resistance value is greater than 1500Ω / □, the conductivity is poor, so it is difficult to obtain a transparent graphene conductive film with better conductivity

Method used

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  • Graphene-carbon nano composite transparent conducting thin film and preparation method thereof
  • Graphene-carbon nano composite transparent conducting thin film and preparation method thereof
  • Graphene-carbon nano composite transparent conducting thin film and preparation method thereof

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preparation example Construction

[0019] The invention provides a method for preparing a graphene-carbon nanocomposite transparent conductive film, which is characterized in that the method comprises preparing a mixed dispersion liquid containing graphite oxide and a carbon-forming precursor, making the mixed dispersion liquid form a film on a substrate, and preparing Obtain graphene oxide-carbon-forming precursor composite film, then under the conditions that graphene oxide is reduced and carbon-forming precursor is carbonized, the graphene oxide-carbon-forming precursor composite film is subjected to heat treatment, and the graphite oxide The weight ratio of carbon-forming precursor and carbon-forming precursor is 1: (0.04-5).

[0020] According to the present invention, the weight ratio of the graphite oxide to the carbon-forming precursor can be selected within a wide range, preferably, the weight ratio of the graphite oxide to the carbon-forming precursor is 1:(0.4-3.5). When the weight ratio of the carbo...

preparation example 1

[0039] Mix graphite flakes (1 part by mass) and sodium nitrate (1 part by mass), ice bath for 2 hours, add potassium permanganate (4 parts by mass), raise the temperature to about 35°C, keep it for 2 hours, then raise the temperature to 75°C, Add 45 parts by mass of water, and after reacting for 15 minutes, add 30% by weight hydrogen peroxide (until no bubbles emerge) and 26.5 parts by mass of water to obtain a bright yellow suspension. The suspension was filtered, the filter cake was washed three times with 3% by weight hydrochloric acid, the obtained filter cake was dried at a temperature of 60° C., and ground into powder to obtain graphite oxide (GO).

[0040] Then 0.005 grams of graphite oxide and different proportions of sucrose (0%, 5%, 10%, 20%, 50%, 100%, 200%, 500% relative to the mass of GO) were dispersed in 5 grams of THF, ultrasonic ( 150W water bath) for 1 hour to obtain a graphene oxide-sucrose dispersion. By dip-coating (Dip-coating) film-making method, the gr...

preparation example 2

[0045] Mix graphite flakes (1 part by mass) and sodium nitrate (2 parts by mass), ice-bath for 10 hours, add potassium permanganate (6 parts by mass), raise the temperature to about 35°C, keep it for 72 hours, then raise the temperature to 95°C, 45 parts by mass of water were added, and after 15 minutes of reaction, 30% by weight hydrogen peroxide (until no bubbles emerged) and 26.5 parts of water were sequentially added to obtain a bright yellow suspension. The suspension was filtered, the filter cake was washed three times with 3% by weight hydrochloric acid, the obtained filter cake was dried at a temperature of 60° C., and ground into powder to obtain graphite oxide (GO).

[0046] Then 0.005 g of graphite oxide and furfural resin (molecular weight is about 1000) (100% relative to GO mass) were dispersed in 1.25 g of methanol and shaken for 72 hours to obtain graphene oxide-furfural resin dispersion. By the film-making method of film pulling, the graphene oxide-furfural res...

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Abstract

The invention provides a graphene-carbon nano composite transparent conducting thin film and a preparation method thereof. The graphitization degree of the graphene-carbon nano-composite thin film prepared by the steps of adding various char formation precursors to graphene oxide dispersion liquid and then carrying out thermal reduction is obviously increased, and thus the electric conduction performance of the thin film is substantially improved, and the light transmittance of the film is not affected. In addition, compared with the pure graphene thin film, the film has the advantages that the roughness is less than 0.2nm, and the evenness is high. The preparation method provided by the invention is simple in technology; reagents used in the preparation method have a mild property; and the preparation method can be applied to the large-scale production and has a very good application prospect in the field of photoelectricity such as touch screens, solar cells and light emitting diodes.

Description

technical field [0001] The invention relates to a graphene-carbon nanocomposite transparent conductive film and a preparation method thereof. Background technique [0002] Transparent conductive films can be widely used in optoelectronic devices such as plasma display panels (PDP), liquid crystal display (LCD) components, light emitting diodes (LED), organic light emitting diodes (OLED), touch panels or solar cells. Currently, the most commonly used material for the transparent film is Indium Tin Oxide (hereinafter referred to as "ITO"). ITO has many excellent physical and chemical properties, and people have accumulated a lot of experience in its actual process. But due to indium oxide (In 2 o 3 ) is only a by-product of zinc ore, and the reserves of indium resources on the earth are limited, so the supply of ITO is unstable and the production cost is high; in addition, the ITO film lacks flexibility and cannot be applied to flexible materials such as polymer substrates;...

Claims

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Application Information

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IPC IPC(8): H01B1/04H01B13/00C01B31/02B82Y40/00B82Y30/00C01B32/15C01B32/184
Inventor 智林杰方岩王杰罗彬张先锋梁明会何海勇贾玉莹邱腾飞
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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