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Single-layer graphene dispersion liquid and preparation method thereof

A single-layer graphene and dispersion technology, applied in the field of single-layer graphene dispersion and its preparation, can solve problems such as difficulty in dispersing single-layer graphene

Active Publication Date: 2015-04-08
BEIJING SCITECH GRAPHENE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a single-layer graphene dispersion liquid and preparation method thereof, to solve the problem that single-layer graphene is difficult to disperse

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  • Single-layer graphene dispersion liquid and preparation method thereof
  • Single-layer graphene dispersion liquid and preparation method thereof
  • Single-layer graphene dispersion liquid and preparation method thereof

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preparation example Construction

[0026] The preparation method of this a kind of monolayer graphene dispersion liquid comprises:

[0027] Step 1, graphite is prepared into secondary expanded graphite;

[0028] Step 2, mixing the secondary expanded graphite and the dispersant in a mass ratio of 5:1 to 1:5 to obtain a mixed dispersion system;

[0029]Step 3, performing mechanical shear peeling on the mixed dispersion system;

[0030] Step 4, obtaining a monolayer graphene dispersion.

[0031] The single-layer graphene dispersion prepared by the preparation method of the above-mentioned single-layer graphene dispersion comprises: 1-10wt% graphene, 0.01-5wt% dispersant; the concentration of the graphene dispersion is 10-60 mg mL -1 The diameter of graphene is 200 nanometers to 10 microns; the dispersant is sodium dodecylbenzenesulfonate, sodium dodecylsulfonate, polyvinylpyrrolidone, sodium cholate, polystyrene, hexadecyl trimethyl One or more ammonium bromide.

[0032] In this embodiment, graphite is first p...

Embodiment 1

[0036] Preparation of secondary expanded graphite: Put 5g of graphite in a 500mL three-necked flask, immerse the three-necked flask in the ice-water mixture, then add 45mL of concentrated nitric acid and 87.5mL of concentrated sulfuric acid, and slowly add 55g of potassium chlorate into the three-necked flask (At least add more than 15 minutes. Note: chlorine dioxide will be produced when adding potassium chlorate, and it will explode when the concentration is high). This process is stirred for 72 hours, and the treated graphite is washed into neutral with a large amount of water, and obtained after drying. powder; then, the oxidized graphite is subjected to high-temperature reduction at 1000-1300°C for an expansion time of 30 seconds to 5 minutes in a tube furnace to obtain primary expanded graphite. 1500 ℃ high temperature reduction expansion to obtain secondary expanded graphite.

[0037] Preparation of single-layer graphene dispersion: mix secondary expanded graphite and p...

Embodiment 2

[0042] Preparation of secondary expanded graphite: Put 5g of graphite in a 500mL three-necked flask, immerse the three-necked flask in the ice-water mixture, then add 50mL of concentrated nitric acid and 98mL of hydrogen peroxide, and slowly add 45g of potassium chlorate to the three-necked flask (at least Add more than 15min.Attention: can produce chlorine dioxide when potassium chlorate is added, can produce explosion when concentration is high), this process stirs and handles 72h, the graphite that handles is washed into neutrality with a large amount of water, obtains powder after drying; The oxidized graphite is in the tube furnace, the expansion time is 30S~5min, and the temperature is 1300~1500℃, and the high temperature reduction is carried out to obtain the primary expanded graphite. After the primary expanded graphite is treated by the same method as above, it is reduced and expanded at a high temperature of 800~1800℃. Obtain secondary expanded graphite.

[0043] Pre...

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Abstract

The invention relates to the field of nanomaterial processing, and particularly relates to a single-layer graphene dispersion liquid and a preparation method thereof. The dispersion liquid comprises the following raw materials in percentage by weight: 1wt%-10wt% of graphene and 0.01wt%-5wt% of a dispersing agent, wherein the concentration of the graphene dispersion liquid is 10-60mg mL<-1>; the diameter of graphene is 200nm-10mn; and the preparation method comprises the following steps: preparing secondary expansion graphite from graphite; mixing secondary expansion graphite with the dispersing agent to obtain a mixed dispersing system; and carrying out mechanical shearing and peeling on the mixed dispersing system, so as to obtain the single-layer graphene dispersion liquid. According to the single-layer graphene dispersion liquid, flakes of secondary expansion graphite can be subjected to mechanical separating, so as to obtain single-layer graphene; and by virtue of the dispersion action of the dispersing agent, the obtained graphene dispersion liquid is relatively good in dispersity, and exists in a single layer.

Description

technical field [0001] The invention relates to the field of nanomaterial processing, in particular to a single-layer graphene dispersion and a preparation method thereof. Background technique [0002] In 2004, Andre Geim and Konstantin Novoselov, physicists at the University of Manchester in the United Kingdom, successfully separated graphene from graphite in experiments, and confirmed that it can exist alone. "The groundbreaking experiment of two-dimensional graphene materials", jointly won the 2010 Nobel Prize in Physics, which kicked off the prelude to the preparation of graphene. Graphene is another important carbon material after fullerene and carbon nanotubes. Graphene is a honeycomb-shaped hexagonal two-dimensional crystal formed by a single layer of carbon atoms arranged in the form of sp 2 Hybridization of forms. The surface area of ​​graphene is as high as 2630m 2 / g, which is twice that of single-walled carbon nanotubes; the electron mobility at room temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 朱英王建锋滕超江雷
Owner BEIJING SCITECH GRAPHENE TECH CO LTD
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