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Single-layer graphene capable of dispersing stably and preparation method thereof

A single-layer graphene and graphene technology, which is applied in the field of single-layer graphene and its preparation, can solve problems such as the adverse effects of graphene, and achieve excellent dispersion performance, good stability, and good compatibility.

Active Publication Date: 2012-04-04
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the presence of stabilizers such as polymers or surfactants will undoubtedly have an adverse effect on the subsequent application of graphene.

Method used

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  • Single-layer graphene capable of dispersing stably and preparation method thereof
  • Single-layer graphene capable of dispersing stably and preparation method thereof
  • Single-layer graphene capable of dispersing stably and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of graphite oxide: take natural graphite powder as raw material, take 10g of natural graphite powder, add 220ml of 98% concentrated sulfuric acid, 5g of sodium nitrate, 30g of potassium permanganate in an ice bath, mechanically stir for 1 hour, and keep The temperature of the mixture is lower than 20°C. The ice bath was removed, and the mixture was stirred and reacted in a water bath at 35° C. for 4 hours, and then diluted with 500 ml of deionized water to obtain a suspension. Continue to react the suspension at 90°C for 15 minutes, add 600ml deionized water and 50ml hydrogen peroxide and react for 5 minutes to obtain a graphite oxide dilution. It was filtered while it was hot, washed with dilute hydrochloric acid solution to remove metal ions, washed with deionized water to remove excess acid, washed several times until neutral, and finally graphite oxide gel was obtained.

[0038] (2) Preparation of graphene oxide: dilute the graphite...

Embodiment 2

[0041] Get the monolayer graphene oxide dispersion liquid 500ml that embodiment 1 prepares, and 0.25g 3, the 4-dihydroxyphenylalanine reducing agent mixes uniformly, reflux reaction 24 hours under 90 ℃, magnetic stirring, filter, wash with water, obtain The black product is the single-layer graphene gel. Redisperse the single-layer graphene gel in water and / or organic solvent without adding any stabilizer to obtain a stable dispersion of single-layer graphene; vacuum-dry the single-layer graphene gel to obtain graphene powder . The single-layer graphene has a diameter of about 0.8 μm and a thickness of less than 1 nm.

Embodiment 3

[0043] (1) Preparation of graphite oxide: take natural graphite powder as raw material, take 10g of natural graphite powder, add 220ml of 98% concentrated sulfuric acid, 5g of sodium nitrate, 30g of potassium permanganate in an ice bath, mechanically stir for 1 hour, and keep The temperature of the mixture is lower than 20°C. The ice bath was removed, and the mixture was stirred and reacted in a water bath at 35° C. for 4 hours, and then diluted with 500 ml of deionized water to obtain a suspension. Continue to react the suspension at 90°C for 15 minutes, add 600ml deionized water and 50ml hydrogen peroxide and react for 5 minutes to obtain a graphite oxide dilution. It was filtered while it was hot, washed with dilute hydrochloric acid solution to remove metal ions, washed with deionized water to remove excess acid, washed several times until neutral, and finally graphite oxide gel was obtained.

[0044] (2) Preparation of graphene oxide: Dilute graphite oxi...

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Abstract

The invention discloses a single-layer graphene capable of dispersing stably and a preparation method thereof, belonging to the field of nanometer graphite conductive materials. The single-layer graphene capable of dispersing stably in water or in an organic solvent is prepared through reduction of single-layer graphene oxide by phenolic aminated compounds. According to the method, the single-layer grapheme is prepared by employing a phenolic aminated green environment-friendly reducing agent, using graphite as a raw material and carrying out the three steps of oxidation, peeling and reduction. The method enables extreme toxicity of hydrazine reducing agents to be avoided, is green and environment-friendly and is applicable to mass production. The single-layer graphene prepared in the invention has the characteristics of stable dispersion in a water phase and / or an organic phase without addition of any stabilizing agents and good conductivity, and can be used in the fields of battery materials, energy storage materials, electronic devices, current-conducting and heat-conducting polymer composite materials, etc.

Description

technical field [0001] The invention belongs to the field of nano-graphite conductive materials, and specifically relates to a single-layer graphene capable of stably dispersing in an aqueous phase or an organic phase prepared based on a phenolic amine reducing agent and a preparation method thereof. Background technique [0002] Graphene is another new type of carbon nanomaterial after the discovery of carbon nanotubes. Since its discovery in 2004, graphene has been a research hotspot. It consists of a single layer of carbon atoms and has excellent mechanical, electrical, thermal and optical properties. It is used in battery materials, energy storage materials, electronic devices, composite materials and other fields. It has broad application prospects. [0003] Like other newly discovered carbonaceous materials, such as carbon nanotubes, the efficient preparation and dispersion of single-layer graphene is an important technology for the application process of graphene. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/00C01B31/04
Inventor 孙培育杜宁开卫华吴刚
Owner TORAY IND INC
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