A kind of wrinkle-free graphene and preparation method thereof

A graphene, wrinkle-free technology, applied in the field of wrinkle-free graphene and its preparation, can solve the problems of complexity, electrical resistivity, reduction of graphene mechanical strength and thermal conductivity, etc., and achieve the effect of thin sheets and fewer defects

Active Publication Date: 2020-09-22
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relevant studies have shown that wrinkles will destroy the hexagonal symmetric lattice structure of graphene, resulting in resistivity and reduced conductivity; wrinkles will cause configuration changes on the graphene surface, induce changes in its local vibrational mass and surface strain energy, and reduce Mechanical strength and thermal conductivity of graphene
The current related graphene preparation methods mostly use chemical vapor deposition. This method needs to anneal the substrate first, and then perform atmospheric pressure chemical vapor deposition to grow the graphene single crystal film on the surface of the substrate. This method is relatively complicated to operate. The required annealing temperature is high, the requirements for experimental conditions are high, and it is difficult to control the growth of graphene

Method used

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  • A kind of wrinkle-free graphene and preparation method thereof

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Embodiment 1

[0021] The wrinkle-free graphene in this embodiment is composed of single-layer or multi-layer graphene structural units, and there is no wrinkle on the surface of the single-layer or multi-layer graphene, and the number of layers is no more than 20.

[0022] A kind of preparation method of above-mentioned wrinkle-free graphene, comprises the steps:

[0023] Disperse 2g of graphite and 2g of sodium chloride in 2ml (2g) of acetophenone solution, place in a reaction kettle, react at 180°C for 20h, cool to room temperature to obtain a graphene dispersion; transfer the graphene dispersion to a centrifuge tube After standing for 3 hours, remove the supernatant, collect 1.9g of precipitate, disperse the precipitate in 91ml of dilute hydrochloric acid (95g) with a concentration of 10wt.%, centrifuge for 20min at a speed of 1500rpm, remove the supernatant, and complete the first time For pickling, add 69.3ml of dilute hydrochloric acid (72.8g) with a concentration of 10wt.% to the 1.8...

Embodiment 2

[0025] The wrinkle-free graphene in this embodiment is composed of single-layer or multi-layer graphene structural units, and there is no wrinkle on the surface of the single-layer or multi-layer graphene, and the number of layers is no more than 20.

[0026] A kind of preparation method of above-mentioned wrinkle-free graphene, comprises the steps:

[0027] Disperse 2g of graphite and 100g of potassium chloride in 127ml (100g) of acetone solution, place in a reaction kettle, react at 200°C for 15h, cool to room temperature to obtain a graphene dispersion; move the graphene dispersion to a centrifuge tube, and After standing for 3 hours, remove the supernatant, collect 1.9g of precipitate, disperse the precipitate in 91ml of 10wt.% dilute hydrochloric acid (95g), centrifuge at 500rpm for 50min, remove the supernatant, and complete the first pickling In the 1.8g precipitate collected after the first pickling, add 51ml of dilute hydrochloric acid (54g) with a concentration of 10...

Embodiment 3

[0029] The wrinkle-free graphene in this embodiment is composed of single-layer or multi-layer graphene structural units, and there is no wrinkle on the surface of the single-layer or multi-layer graphene, and the number of layers is no more than 20.

[0030] A kind of preparation method of above-mentioned wrinkle-free graphene, comprises the steps:

[0031]Disperse 2g of graphite and 100g of magnesium sulfate in 211ml (200g) of cyclopentanone solution, place in a reaction kettle, react at 220°C for 10h, cool to room temperature to obtain a graphene dispersion; move the graphene dispersion to a centrifuge tube, After standing for 3 hours, remove the supernatant, collect 1.9g of precipitate, disperse the precipitate in 91ml of 10wt.% dilute hydrochloric acid (95g), centrifuge at 1000rpm for 30min, remove the supernatant, and complete the first acid Washing, in the 1.82g precipitate that will be collected after finishing the 1st pickling, add the dilute hydrochloric acid (81.9g)...

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Abstract

The invention belongs to the technical field of graphene preparation methods, and particularly relates to non-wrinkle graphene and a preparation method thereof. The preparation method comprises the following steps: dispersing graphite and a metal salt catalyst into a reaction solvent containing carbonyl, putting the reaction solvent into a reaction kettle, carrying out heating for a reaction to prepare a graphene dispersion liquid, standing the graphene dispersion liquid until layering, removing the supernatant, pickling the residual parts, and dispersing the residual parts in an organic solvent, carrying out ultrasonic treatment and centrifuging, collecting the supernatant turbid liquid, and carrying out drying to obtain the wrinkle-free graphene. Compared with ''rough'' wrinkled graphene, the graphene obtained by the method is flat and is free of wrinkles, and has a good application prospect in the aspects of oxidation resistance and electrical conductivity.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of graphene, and in particular relates to a wrinkle-free graphene and a preparation method thereof. Background technique [0002] Graphene is widely used in electronic devices, transistors, functional composite materials, aerospace and other fields due to its good mechanical properties, electrical properties and chemical properties. At present, the methods for preparing graphene include redox method, vapor deposition method, exfoliation method, solvothermal method, etc., wherein the exfoliation method includes mechanical exfoliation method, electrochemical exfoliation method, liquid phase exfoliation method, etc. The graphene prepared by the traditional redox method has many defects, and the oxidants used are mainly strong oxidants such as concentrated sulfuric acid and potassium permanganate that are not easy to recover, which are harmful to the environment; the vapor deposition metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19
CPCC01B32/19
Inventor 邓天昇柴琳侯相林王英雄
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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