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Preparation method of ultra-thin two-dimensional graphite flake

A graphite sheet, ultra-thin technology, applied in the field of preparation of ultra-thin two-dimensional graphite sheet, can solve the problems of difficulty in obtaining high-concentration suspension, low yield of two-dimensional graphite sheet, and restrictions on practical application, etc., to achieve low cost, The effect of high yield and high product quality

Inactive Publication Date: 2018-09-18
DONGGUAN HONGYI THERMAL CONDUCTMTY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the yield of two-dimensional graphite sheets prepared by this method is low and is prone to agglomeration in the solution, it is difficult to obtain a high-concentration suspension, and few of the obtained two-dimensional graphite sheets are large-sized single-layer or few-layer structure, which seriously restricts its practical application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a method for preparing ultra-thin two-dimensional graphite sheet, comprising the following steps:

[0026] 1) Add graphite to a mixed solvent of ethanol and water, add sodium dodecylsulfonate at the same time, and prepare an aqueous graphite solution containing sodium dodecylsulfonate by means of ultrasonic waves;

[0027] 2) Perform high-speed shearing on the graphite aqueous solution containing sodium dodecylsulfonate for 3-8 hours. Specifically, after 3 hours of high-speed shearing, the concentration of graphite flakes in the suspension reaches 20-30g / L. When high-speed shearing After 5 hours, the thickness of more than 60% of the graphite flakes in the suspension is less than 4nm, and finally a high-concentration suspension is obtained;

[0028] 3) Centrifuge the high-concentration suspension to obtain the supernatant and centrifugal sediment containing two-dimensional graphite flakes;

[0029] 4) Sequentially freeze-dry and vacuum-calcine ...

Embodiment 2

[0031] This embodiment provides a method for preparing ultra-thin two-dimensional graphite sheet, comprising the following steps:

[0032] 1) Add graphite to a mixed solvent of NMP and water, add sodium citrate at the same time, and prepare an aqueous graphite solution containing sodium citrate by means of heating;

[0033] 2) Perform high-speed shearing on the graphite aqueous solution containing sodium citrate for 3-8 hours. Specifically, after 3 hours of high-speed shearing, the concentration of graphite flakes in the suspension reaches 20-30g / L. After 5 hours of high-speed shearing, the suspension The thickness of more than 60% of the graphite flakes in the liquid is less than 4nm, and finally a high-concentration suspension is obtained;

[0034] 3) Centrifuge the high-concentration suspension to obtain the supernatant and centrifugal sediment containing two-dimensional graphite flakes;

[0035] 4) Spray-dry the clear liquid containing two-dimensional graphite flakes, and...

Embodiment 3

[0037] This embodiment provides a method for preparing ultra-thin two-dimensional graphite sheet, comprising the following steps:

[0038] 1) Add graphite to a mixed solvent of DMF and water, add 1-pyrenemethylamine hydrochloride at the same time, and prepare an aqueous graphite solution containing 1-pyrenemethylamine hydrochloride by means of air flow;

[0039] 2) Perform high-speed shearing on the graphite aqueous solution containing 1-pyrenemethylamine hydrochloride for 3-8 hours. Specifically, after 3 hours of high-speed shearing, the concentration of graphite flakes in the suspension reaches 20-30 g / L. When high-speed shearing After cutting for 5 hours, the thickness of more than 60% of the graphite flakes in the suspension is less than 4nm, and finally a high-concentration suspension is obtained;

[0040] 3) Centrifuge the high-concentration suspension to obtain the supernatant and centrifugal sediment containing two-dimensional graphite flakes;

[0041] 4) Freeze-dry t...

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Abstract

The invention belongs to the technical field of graphite materials, and particularly relates to a preparation method of an ultra-thin two-dimensional graphite flake. The preparation method comprises the following steps: 1) adding graphite to a solvent, adding a stabilizer at the same time, and preparing a graphite aqueous solution containing the stabilizer in virtue of the effects of ultrasonic waves, heating or gas flow; 2) carrying out high-speed shearing on the graphite aqueous solution containing the stabilizer to obtain a high-concentration suspension; 3) carrying out centrifugal separation on the high-concentration suspension to obtain a clear liquid containing a two-dimensional graphite flake and centrifuged sediment; 4) drying and calcining the clear liquid containing the two-dimensional graphite flake to obtain a purified ultra-thin two-dimensional graphite flake. Compared with the prior art, the preparation method disclosed by the invention can quickly realize large-scale preparation of ultra-thin two-dimensional graphite flakes.

Description

technical field [0001] The invention belongs to the technical field of graphite materials, in particular to a method for preparing ultra-thin two-dimensional graphite sheets. Background technique [0002] The electronic structure in graphite flakes with a thickness of less than 10 atomic layers is significantly different from that of the bulk material graphite, so graphite flakes with a thickness of less than 10 atomic layers (about 4 nm in total) are generally considered to be two-dimensional materials. In recent years, two-dimensional graphite sheets have attracted extensive attention and research because of their excellent electronic, thermal, optical and mechanical properties. [0003] At present, the preparation methods of two-dimensional graphite sheets mainly include chemical vapor deposition, mechanical exfoliation, (electro)chemical exfoliation and ultrasonic liquid phase exfoliation. Although these methods can prepare two-dimensional graphite sheets, there are sti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205
CPCC01B32/205
Inventor 朱全红施立毛
Owner DONGGUAN HONGYI THERMAL CONDUCTMTY MATERIAL CO LTD
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