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
View PDF2 Cites 54 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strong oxidant used in the process of chemical exfoliation will destroy the carbon skeleton of the graphen

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low-cost mass preparation method of high-quality graphene
  • Low-cost mass preparation method of high-quality graphene
  • Low-cost mass preparation method of high-quality graphene

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0048] D. Preparation of graphene film

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

[0050] (1) Disperse the obtained graphene in water to form a graphene hydrosol with a concentration of 0.05-0.5g / L, such as figure 1 Shown. The graphene concentration is determined based on the film thickness.

[0051] (2) Prepare graphene film by vacuum filtration method. The mixed fiber filter membrane with a pore size of 200nm is used as the filter medium, and 0.5-1L of graphene hydrosol is added. After filtering for 6-12 hours, a graphene film attached to the mixed fiber filter membrane is obtained.

[0052] (3) Dry 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 ...

Example Embodiment

[0057] Example 1

[0058] Synthesis of graphene of the present invention

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

[0060] Weighed to obtain 4.45 g of graphene. It is calculated that the yield is 0.89 g of graphene per g of graphite.

[0061] Preparation of graphene by chemical exfoliation method in the prior art

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

Example Embodiment

[0077] Example 2

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

[0079] The ball milling agent used in the present invention is non-toxic, harmless and cheap dry ice, and the processes of washing, filtering and drying are omitted. Make the process of the present invention easier.

[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....

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Concentrationaaaaaaaaaa
Conductivityaaaaaaaaaa
Conductivityaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap