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Flexible conductive thin film compositing two-dimensional graphene and one-dimensional nanowire and preparation method thereof

A flexible conductive and composite film technology, which is applied to the conductive layer on the insulating carrier, carbon silicon compound conductor, cable/conductor manufacturing, etc., can solve the problems of small size of graphene, affecting the electrical properties of graphene film, large grain boundaries, etc. , to achieve the effect of easy operation, good strength and low preparation cost

Active Publication Date: 2013-07-24
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the obtained graphene is small in size (50nm-500nm), and there are usually a large number of grain boundaries and defects in the structure, especially the contact resistance between graphenes during the graphene assembly process, which seriously affects the electrical properties of graphene films.

Method used

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  • Flexible conductive thin film compositing two-dimensional graphene and one-dimensional nanowire and preparation method thereof
  • Flexible conductive thin film compositing two-dimensional graphene and one-dimensional nanowire and preparation method thereof
  • Flexible conductive thin film compositing two-dimensional graphene and one-dimensional nanowire and preparation method thereof

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preparation example Construction

[0046] The preparation method of the flexible conductive film compounded by two-dimensional graphene and one-dimensional nanowires of the present invention comprises:

[0047] (1) graphene and nanowire are dispersed in aqueous solution or organic solvent, obtain graphene / nanowire suspension;

[0048] (2) adding a certain amount of dispersing aid to the above-mentioned suspension, and after ultrasonic dispersion, a stable graphene / nanowire mixed dispersion is obtained;

[0049] (3) Suction filter the above-mentioned mixed dispersion liquid through filter membrane or filter paper, vacuum dry, directly obtain flexible graphene / nanowire / filter membrane or filter paper composite material;

[0050] (4) Remove the filter membrane or filter paper by solvent dissolution and cold pressing to obtain an unsupported graphene / nanowire composite film, optionally, it can also be transferred to an insulating or conductive or flexible substrate;

[0051] (5) Putting the graphene / nanowire compo...

Embodiment 1

[0068] (1) Preparation of reduced graphene oxide

[0069] Reduced graphene oxide was prepared by the typical Hummer method, put in a large beaker in an ice-water bath, and add 110 mL of concentrated H 2 SO 4 , stirred on a magnetic stirrer, added 5g of 100 mesh flake graphite, and then added 2.5g NaNO 3 , then slowly add 15g KMnO 4 , stirred and reacted on a magnetic stirrer for 90 minutes, slowly added 220mL deionized water, heated to keep the temperature at about 70-100°C, slowly added a certain amount of hydrogen peroxide (5%) for high temperature reaction, and the reacted solution was centrifuged several times in a centrifuge Wash to obtain graphene oxide, mix 0.1 g of the prepared graphite oxide with 100 mL of deionized water, and ultrasonically vibrate in an ultrasonic oscillator for 30 minutes. Then, add 1g NaBH 4 , heated and refluxed at 100° C. for 8 hours, left to stand and filtered, and dried naturally to collect graphene, and the number of graphene layers is 1-...

Embodiment 2

[0075] The preparation method is basically the same as in Example 1, except that in step (2), 7.5 mg of carbon nanotubes and 22.5 mg of redox graphene are used to composite, and the sheet resistance of the graphene / carbon nanotube composite film is 155 Ω / sq ., the conductivity is 3.36S / cm.

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Abstract

The invention relates to a flexible conductive thin film compositing a two-dimensional graphene and a one-dimensional nanowire and a preparation method of the flexible conductive thin film. The preparation method includes the following steps: dispersing the graphene, the nanowire and dispersion auxiliary in solvent, obtaining graphene / nanowire solvent which is well dispersed after the solvent is processed through ultrasound concussion, and obtaining a graphene / nanowire composite thin film after the graphene / nanowire solvent is processed through vacuum filtration and drying. The thickness of the composite thin film is 10 nanometers to 1000 micrometers, the composite thin film has good strength and flexibility, square resistance is between 0.001 ohm per square and 3000 ohms per square, and electrical conductivity is between 0.01 siemens per centimeter to 5000 siemens per centimeter. The graphene / nanowire composite thin film which is obtained with the adoption of the preparation method has good strength, flexibility, and electrical conductivity, and is controllable in thickness, cuttable in shape, simple in preparing process, easy to operate, low in manufacturing cost, and suitable for solar batteries, energy storage, heat dissipation, catalysis, sensing, and conductive composite material fields.

Description

technical field [0001] The invention relates to a flexible conductive film composed of two-dimensional graphene and one-dimensional nanowire and a preparation method thereof. The flexible conductive film is mainly used in the fields of solar cells, energy storage, heat dissipation, catalysis, sensing and conductive composite materials, and belongs to the field of nanomaterials. Background technique [0002] Graphene is a two-dimensional (2D) periodic honeycomb lattice structure composed of carbon six-membered rings. Its unique crystal structure gives it excellent properties, such as high thermal conductivity, high mechanical strength, and unique electrical and optical properties. It has broad application prospects in the fields of solar devices, energy storage, catalysis, sensing and conductive composite materials. [Specific references can be found in: K.S.Novoselov et al. "Science", 2004, 306: 666. C.Lee et al. "Science", 2008, 321: 385. K.S.Kim et al. "Nature (Nature)" ,...

Claims

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Application Information

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IPC IPC(8): H01B5/00H01B5/14H01B1/04H01B13/00
Inventor 黄富强毕辉林天全
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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