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A kind of preparation method of graphene

A graphene and graphite technology, applied in the field of graphene, can solve the problems of low quality, many product defects, and high toxicity of reducing agents, and achieve the effect of high quality and less product defects

Inactive Publication Date: 2017-12-22
CHANGZHOU CHENGTIAN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, some conventional methods for preparing graphene have the following disadvantages: many product defects, low quality, and high toxicity of reducing agents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of preparation method of graphene, comprises the following steps:

[0023] (1) Purify natural flake graphite: Add 10g of natural flake graphite to 100g of 30% sodium hydroxide solution by mass percentage, then add 2g of boric acid flux, stir well, and react at 80~100°C for 1.5h , filter after alkali treatment, wash with water until neutral; add the graphite after alkali treatment into 50g of 20% hydrochloric acid by mass percentage, stir evenly, react at 60-80°C for 20-30min, filter, wash with water until neutral, Dry at 65~75°C to obtain purified graphite;

[0024] (2) Preparation of graphite oxide: Add 90g of concentrated sulfuric acid, 5g of potassium persulfate, 5g of phosphorus pentoxide and 5g of purified graphite into the reaction vessel, slowly raise the temperature to 60~70℃, react for 3~4h, wash with water until neutral , dry to obtain preliminary oxidized graphite; carry out deep oxidation to preliminary oxidized graphite, add preliminary oxidized gra...

Embodiment 2

[0028] A kind of preparation method of graphene, comprises the following steps:

[0029] (1) Purify natural flake graphite: Add 10g of natural flake graphite to 100g of 50% sodium hydroxide solution by mass percentage, then add 2g of boric acid flux, stir well, and react at 80~100°C for 0.5h , filter after alkali treatment, wash with water to neutrality; add graphite after alkali treatment to 30g mass percent concentration of 30% hydrochloric acid, stir evenly, react at 60~80°C for 20~30min, filter, wash with water to neutrality, Dry at 65~75°C to obtain purified graphite;

[0030] (2) Preparation of graphite oxide: Add 100g of concentrated sulfuric acid, 5g of potassium persulfate, 5g of phosphorus pentoxide and 5g of purified graphite into the reaction vessel, slowly raise the temperature to 60~70℃, react for 3~4h, wash with water until neutral , dry to obtain preliminary oxidized graphite; carry out deep oxidation to the preliminary oxidized graphite, add the preliminary o...

Embodiment 3

[0034] A kind of preparation method of graphene, comprises the following steps:

[0035] (1) Purify natural flake graphite: Add 10g of natural flake graphite to 100g of 40% sodium hydroxide solution by mass percentage, then add 2g of boric acid flux, stir well, and react at 80~100°C for 1h, Filter after alkali treatment, wash with water until neutral; add graphite after alkali treatment into 40g of hydrochloric acid with a concentration of 25% by mass, stir evenly, react at 60-80°C for 20-30min, filter, wash with water until neutral, Dry at 65~75°C to obtain purified graphite;

[0036] (2) Preparation of graphite oxide: Add 90g of concentrated sulfuric acid, 5g of potassium persulfate, 5g of phosphorus pentoxide and 5g of purified graphite into the reaction vessel, slowly raise the temperature to 60~70℃, react for 3~4h, wash with water until neutral , drying to obtain preliminary oxidized graphite; carry out deep oxidation to preliminary oxidized graphite, add preliminary oxi...

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Abstract

The invention discloses a graphene preparation method comprising the following steps: natural flaky graphite is subjected to a purification treatment, wherein the natural flaky graphite is subjected to an alkali treatment, the graphite obtained after the alkali treatment is subjected to an acid treatment in hydrochloric acid, and drying is carried out, such that purified graphite is obtained; graphite oxide is prepared, wherein the purified graphite is subjected to preliminary oxidation, and the preliminarily oxidized graphite is subjected to deep oxidation; graphene oxide is prepared, wherein the prepared graphite oxide is crushed and is subjected to an expansion treatment, the obtained material is subjected to an ultrasonic stripping treatment, such that graphene oxide suspension liquid is obtained; a reducing agent and a stabilizing agent are added into the graphene oxide suspension liquid; the pH value of the graphene oxide suspension liquid is regulated to 7.5-8.5; reduction is carried out for 6-9h in a water bath with a temperature of 60-90 DEG C; cooling and centrifugation are carried out; the obtained product is washed to neutral; and freeze drying is carried out, such that graphene is obtained. With the method, the product provided by the invention has low defect and high quality. The method adopts a green reduction process, and is more suitable for industrialized productions.

Description

technical field [0001] The invention relates to the field of graphene, in particular to a method for preparing graphene. Background technique [0002] Graphene is made of carbon atoms with sp 2 The hybrid orbitals form a hexagonal two-dimensional crystal with a single atomic layer in the shape of a honeycomb. Graphene's unique structure endows it with extraordinary physical properties. The properties of electrons (charge carriers) in graphene are very similar to relativistic neutrinos, and their movement speed reaches 1 / 300 of the speed of light, far exceeding the movement speed of electrons in general conductors. Theoretically, the electron mobility of graphene can reach 2×10 5 cm 2 / V·s, making it exhibit extraordinary conductivity. Graphene has excellent transparency, and the transmittance of single-layer graphene can reach 97.7% in the visible-infrared region. Therefore, graphene is a good transparent conductive material and can be used as an electrode in electroni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19
Inventor 韩亚娟
Owner CHANGZHOU CHENGTIAN ELECTRONICS