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Method for preparing graphene by chemical oxidation reduction

A technology of chemical oxidation and graphene, which is applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of low reduction efficiency and long reduction time, and achieve high reduction efficiency, high reduction degree, and good industrial prospects Effect

Inactive Publication Date: 2011-05-25
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two reducing agents are all environmentally friendly, the reduction time is too long (reaction takes 48 hours), and the reduction efficiency is low

Method used

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  • Method for preparing graphene by chemical oxidation reduction
  • Method for preparing graphene by chemical oxidation reduction
  • Method for preparing graphene by chemical oxidation reduction

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Experimental program
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Effect test

Embodiment 1

[0027] First prepare graphite oxide with water solubility by the existing Hummers method, then add graphene oxide into water at a concentration of 1 mg / ml, and ultrasonically oscillate or stir it at room temperature to uniformly disperse it in water to obtain graphite oxide Aqueous solution of graphene oxide (pH=7); first, the obtained aqueous solution of graphene oxide is uniformly coated on the polyester substrate by spin coating, the coating thickness is controlled to be ≤4mm, and the spin coating speed is 100 rpm, and then it is applied on the After vacuum drying at 80°C, a graphene oxide film is formed on the substrate; sodium dithionite and catalyst sodium hydroxide are formulated into a reducing agent aqueous solution at a mass ratio of 1:6, and the concentration of the aqueous solution is 2% by mass of sodium hydroxide ; First, the substrate covered with graphene oxide film is immersed in the reducing agent aqueous solution, and the reduction reaction is carried out at ...

Embodiment 2

[0029]First prepare graphite oxide with water solubility by the existing Hummers method, then add graphene oxide into water at a concentration of 2 mg / ml, and ultrasonically oscillate or stir it at room temperature to uniformly disperse it in water to obtain graphite oxide Aqueous solution of graphene oxide (pH=7); first, the obtained aqueous solution of graphene oxide is evenly coated on the ceramic substrate by spin coating, and the coating thickness is controlled to be less than or equal to 4mm. After vacuum-drying at ℃, a graphene oxide film is formed on the substrate; sodium dithionite and catalyst sodium hydroxide are formulated into an aqueous reducing agent solution in a mass ratio of 1:4, and the concentration of the aqueous solution is 5% in terms of sodium hydroxide mass; First, the substrate covered with graphene oxide film is immersed in an aqueous reducing agent solution, and the reduction reaction is performed at 65°C for 15 minutes, and then the product is washe...

Embodiment 3

[0031] First prepare water-soluble graphene oxide from graphite by the existing Hummers method, then add graphene oxide into water at a concentration of 6 mg / ml, ultrasonically oscillate or stir at room temperature to make it evenly dispersed in water, and add ammonia water Adjust the pH=12 of the graphene oxide aqueous solution; first, the obtained graphene oxide aqueous solution is uniformly coated on the quartz glass substrate by spin coating, and the coating thickness is controlled to be less than or equal to 4mm, and the spin coating speed is 100 revolutions per minute, and then the After it is vacuum-dried at 80° C., a graphene oxide film is formed on the substrate; sodium dithionite and catalyst sodium hydroxide are formulated into an aqueous solution of reducing agent in a mass ratio of 1:2, and the concentration of the aqueous solution is calculated by the mass of sodium hydroxide. 10%; firstly dip the substrate covered with graphene oxide film in an aqueous solution o...

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Abstract

The invention discloses a method for preparing graphene by chemical oxidation reduction, which comprises the following steps: preparing a graphene oxide water solution according to the concentration of 1-6 mg / ml from graphene oxide which is prepared from graphite by the existing chemical oxidation method; then, uniformly coating the graphene oxide water solution on a substrate by using a spin coating method or pouring method, and carrying out vacuum drying to form a graphene oxide film; and immerging the substrate coated with the graphene oxide film in a reducer water solution which is prepared from sodium hydrosulfite and sodium hydroxide according to the mass ratio of (1:2)-(1:6), carrying out reducing reaction at 50-80 DEG C for 12-20 minutes, washing with water to neutral, and drying to obtain a black graphene film. The sodium hydrosulfite used in the method disclosed by the invention is a mild, nontoxic and efficient reducer, is harmless to people and does not pollute the environment, thus the sodium hydrosulfite has the advantages of high safety and high reduction efficiency; and in addition, the sodium hydrosulfite has the advantages of low price and wide sources, thus the sodium hydrosulfite has wide industrial prospects and can be used for large-scale production of graphene products.

Description

technical field [0001] The invention belongs to the technical field of methods for preparing graphene, and in particular relates to a method for preparing graphene by chemical redox. Background technique [0002] Since graphene was prepared in the laboratory in 2004, graphene has a series of novel and special properties due to its unique honeycomb single-layer carbon atom structure (Novoselov K S, et al.Science 2004, 306: 666) . First of all, the structure of graphene is very stable, its tensile strength can reach 50-125GPa, and its tensile modulus is close to 1TPa; they are 100 times and 4 times that of steel respectively, but the density is indeed 1 / 6 of steel, which is the current energy The material with the highest specific strength was prepared. The study also found that graphene has special electromagnetic properties, and at high electron mobility (>15,000cm 2 V -1 the s -1 ) will not disappear under the conductivity (4e 2 / h) This anomalous quantum Hall effe...

Claims

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Application Information

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IPC IPC(8): C01B31/14C01B32/384
Inventor 陈枫傅强周天楠刘凯邓华张琴王柯
Owner SICHUAN UNIV
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