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Low-cost mass preparation method of high-quality graphene

A graphene, high-quality technology, applied in the directions of graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems such as the decline of graphene's electrical conductivity, and achieve the effects of low preparation cost, easy to scale up production, and high electrical conductivity

Inactive Publication Date: 2013-11-06
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The strong oxidant used in the process of chemical exfoliation will destroy the carbon skeleton of the graphene plane, resulting in defects, resulting in a decrease in the electrical conductivity of the obtained graphene

Method used

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  • Low-cost mass preparation method of high-quality graphene
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  • Low-cost mass preparation method of high-quality graphene

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0048] D. Preparation of Graphene Films

[0049] Conductivity is an important indicator to prove the quality of graphene, and good conductivity is the prerequisite for the further utilization of graphene. To this end, graphene was prepared into thin films as follows.

[0050] (1) Gained graphene is dispersed in water, and configuration forms the graphene hydrosol that concentration is 0.05-0.5g / L, as figure 1 shown. The graphene concentration is determined according to the film thickness.

[0051] (2) Prepare a graphene film by vacuum filtration. Use a mixed fiber filter membrane with a pore size of 200 nm as the filter medium, and add 0.5-1 L of graphene hydrosol. Filtrate for 6-12 hours to obtain a graphene film attached to the mixed fiber filter membrane.

[0052] (3) drying the obtained film at 50-70° C. for 1-3 hours to obtain a flexible graphene film.

[0053] (4) In order to increase the contact between the graphene sheets, the obtained graphene film is pressed by...

Embodiment 1

[0058] Synthesis of Graphene of the present invention

[0059] Get 5 grams of 100-mesh flake graphite (particle size less than 150 μm) and 15 grams of oxalic acid and put it into a ball mill jar with an inner diameter of 10 cm, and add stainless steel balls with a particle size of 5 mm that account for about 1 / 3 of the ball mill jar volume. After tightening the ball mill jar, put it into the high energy ball mill. After ball milling at a rotational speed of 500 rpm for 24 hours, 1 L of deionized water was added to wash out the graphene. Stir well for 1 hour to ensure that the oxalic acid is all dissolved in the water. Filter, wash with 1L of deionized water, and obtain graphene powder after vacuum drying.

[0060] Weigh, obtain the graphene of 4.45g. The yield is calculated to be 0.89 grams of graphene per gram of graphite.

[0061] Graphene prepared by chemical exfoliation method in the prior art

[0062] In order to highlight the excellent electrical conductivity of the...

Embodiment 2

[0078] Get 5 grams of 100-mesh flake graphite (particle size less than 150 μm) and 500 grams of dry ice and put it into a ball mill jar with an inner diameter of 10 cm, and add stainless steel balls with a particle size of 5 mm that account for about 1 / 3 of the ball mill jar volume. After tightening the ball mill jar, put it into the high energy ball mill. After ball milling for 48 hours at a rotating speed of 500 rpm, the ball mill jar was opened to allow the dry ice to fully volatilize to obtain graphene powder. Weigh, obtain the graphene of 4.01g. The yield is calculated to be 0.8 grams of graphene per gram of graphite.

[0079] The ball milling agent used in the invention is non-toxic, harmless and cheap dry ice, which saves the process of washing, filtering and drying. Let the process of the invention be simpler.

[0080] The preparation of the graphene film and the test of its conductivity are as in Example 1, and the measured conductivity is 1085 S / cm.

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Abstract

The invention discloses a low-cost mass preparation method of high-quality graphene. The low-cost mass preparation method comprises the following steps that graphite and an additive undergo a local or intercalation reaction so that boundary functionalization or intercalated graphite formation is realized; and graphite is peeled by ball milling or an ultrasonic method so that graphene is obtained. The high-quality graphene has water solubility and can forms good graphene hydrosol. Compared with graphene obtained by the traditional chemical peeling method, the high-quality graphene provided by the invention can be prepared simply, has a low cost, less defects, good conductivity and high quality and is suitable for mass production. The high-quality graphene provided by the invention has wide application prospects in photoelectric devices such as copper indium gallium diselenide, cadmium telluride and dye sensitization solar cells and in fields of panel display, supercapacitors, field emitter materials, and lithium ion batteries.

Description

technical field [0001] The invention relates to the field of material chemical preparation, and more specifically relates to a low-cost macro-preparation method of high-quality graphene. Background technique [0002] Graphene is a single atomic layer material with a two-dimensional honeycomb structure composed of carbon atoms and a benzene ring as the basic unit. Due to the characteristics of single-layer carbon atoms, graphene is a zero-energy gap material, the effective mass of electrons is zero, and the movement speed is 1 / 300 of the speed of light. It is an ideal material for physical research; the electron mobility is as high as 200,000cm 2 / V.s, conductivity up to 10 6 S / m, which is conducive to the effective collection of charges, is an ideal electrode material; the visible-near infrared transmittance is 97.7%, and the specific surface area is 2600m 2 / g, thermal conductivity up to 5000W / m·K, strength up to 130GPa, etc. Therefore, graphene is expected to be widely ...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/19C01B32/194
Inventor 黄富强林天全陈剑
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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