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Method for preparing high-quality graphene

A graphene, high-quality technology, applied in the field of high-quality graphene preparation, can solve the problems of graphene's electrical conductivity decline, etc., and achieve the effect of low cost, high quality and few defects

Active Publication Date: 2012-04-11
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • 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 graphene plane, resulting in defects, resulting in a decrease in the electrical conductivity of the obtained graphene

Method used

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  • Method for preparing high-quality graphene
  • Method for preparing high-quality graphene
  • Method for preparing high-quality graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Synthesis of Graphene

[0038] Take out potassium metal in kerosene and put it into an anhydrous and oxygen-free glove box (containing H 2 O2<0.1ppm) for future use. Take 2.0g of potassium in the glove box, put it into a 30mL stainless steel reaction kettle with polytetrafluoroethylene lining, and add 10mL of carbon tetrachloride. Tighten the seal quickly. Put the reaction kettle into an oven, rapidly raise the temperature to 120°C within 60 minutes, and keep the temperature for 8 hours.

[0039] Purification of Graphene

[0040] After the reaction was over, it was naturally cooled to room temperature. Open the reaction kettle, add 100mL of acetone to the inner lining, wash out all the reaction products into a 200mL beaker, and stir thoroughly for 30min. filter. Wash the filter cake with deionized water, add 100mL of 10% hydrochloric acid solution, heat to 60°C, and fully stir for 30min. Filter and wash with about 1 L of deionized water to fully remove the by-pro...

Embodiment 2

[0055] Take 4.5g of carbon tetrabromide (CBr 4 ) was dissolved in 20mL of benzene, put into a polytetrafluoroethylene liner with a volume of 30mL, and 2.0g of potassium was taken. Quickly put it into the stainless steel reaction kettle and tighten the seal. Put the reaction kettle into an oven, rapidly raise the temperature to 160°C within 60 minutes, and keep the temperature for 12 hours.

[0056] The impurity removal purification and electrochemical performance testing process are as in Example 1.

Embodiment 3

[0058] Take 8 mL of chloroform in the glove box, put it into a polytetrafluoroethylene liner with a volume of 30 mL, and take 2.0 g of potassium. Quickly put it into the stainless steel reaction kettle and tighten the seal. Put the reaction kettle into an oven, heat up to 60°C rapidly, and keep the temperature for 10h.

[0059] The impurity removal purification and electrochemical performance testing process are as in Example 1.

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Abstract

The invention discloses a method for preparing high-quality graphene, which is characterized by comprising the following steps of: reacting active metals with low-carbon halogenated hydrocarbons or absolute ethyl alcohols in a certain time at a certain temperature so as to generate new ecological carbon; then, restructuring the new ecological carbon so as to obtain graphene; and finally, carrying out purification on the obtained graphene so as to obtain high-quality graphene. Compared with the traditional chemical stripping method for preparing graphene, the method disclosed by the invention is simple in operation and low in cost, and can prepare less-defect, good-electroconductivity and high-quality graphene. The graphene prepared by using the method disclosed by the invention can have a broad application prospect in the fields of photoelectric devices such as CIGS (copper indium gallium selenide), CdTe(cadmium telluride) and dye sensitized solar cells and the like, flat-panel displays, super capacitors, field emission materials, lithium ion batteries, and the like.

Description

technical field [0001] The invention relates to a method for preparing high-quality graphene, which belongs to the technical field of material chemical preparation. Background technique [0002] Graphene is a monoatomic layer material with a two-dimensional honeycomb structure composed of carbon atoms and a benzene ring as the basic unit. and three-dimensional graphite) basic unit. Graphene has excellent electrical, thermal and mechanical properties, for example, graphene has a high carrier mobility (up to 15000 cm 2 V -1 the s -1 ), and the carriers show obvious bipolar field effect characteristics and room temperature submicron-scale ballistic transport characteristics, extremely high and continuously adjustable carrier concentration (up to 10 13 cm -2 ); the strength of graphene can reach 130GPa, which is more than 100 times that of steel; the thermal conductivity of graphene can reach 5000W / m K, which is 3 times that of pure diamond at room temperature; Both have e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 黄富强林天全
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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