Method for preparing graphene and graphene composite through reducing graphene oxide at room temperature

A technology for composite materials and graphene, which is applied in the field of preparing graphene and its composite materials by reducing graphene oxide at room temperature, which can solve the problems of difficult removal of impurities and slow reaction, and achieve the effects of low cost, reduced dosage, and avoiding damage

Active Publication Date: 2016-05-04
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although sodium borohydride can reduce graphene oxide at room temperature, due to the limitation of its reducing ability, the reaction is very slow at normal temperature, and it can be completely reacted in 7 days at a higher concentration (Wang Kuan, The simple preparation of graphene at room temperature and its capacitance Performance research, master's degree thesis of Shaanxi Normal University, 2011), using noble metal nanoparticles and Lewis acids as catalysts, although it can speed up the reduction reaction, it introduces impurities that are not easy to remove

Method used

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  • Method for preparing graphene and graphene composite through reducing graphene oxide at room temperature
  • Method for preparing graphene and graphene composite through reducing graphene oxide at room temperature
  • Method for preparing graphene and graphene composite through reducing graphene oxide at room temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Disperse 10mg of graphene oxide into 50ml of deionized water, and use ultrasonic dispersion to make it fully dispersed to obtain a graphene oxide dispersion with a concentration of 0.2mg / ml; 10mg of nano-silver and iron tetroxide loaded graphene oxide ternary The composite catalyst was dispersed in 50 ml of deionized water, and ultrasonic dispersion was used to make it fully dispersed to obtain a catalyst dispersion with a concentration of 0.2 mg / ml; then, the graphene oxide dispersion and the catalyst dispersion were uniformly mixed, and it was to be returned Stock solution

[0089] Add 50mg of metal sodium borohydride to the solution to be reduced, sonicate it to make it evenly dispersed, and obtain a concentration of the reducing agent dispersion of 0.5mg / ml, and then stir at room temperature for a reduction reaction for 0.5 hours; after the reduction reaction is over A permanent magnet is used to separate the catalyst from the product suspension, and the product suspen...

Embodiment 2

[0092] Disperse 1mg of graphene oxide and 1mg of nano-silver and ferroferric oxide supported graphene oxide ternary composite catalyst into 100ml of deionized water, and use ultrasonic dispersion to make it fully dispersed to obtain a concentration of 1mg / ml graphene oxide dispersion and Add 5mg of sodium borohydride to the solution to be reduced with a concentration of 1mg / ml graphene oxide dispersion, and ultrasonically disperse it sufficiently to obtain a concentration of the reducing agent dispersion of 0.05mg / ml. Stir at room temperature, the reduction reaction takes place for 0.5 hours; after the reduction reaction, the catalyst is separated from the product suspension with a permanent magnet, and the product suspension is subjected to dialysis treatment to obtain solid graphene

[0093] The characteristic absorption peak of the reaction system is red-shifted from 230 nm of graphene oxide to 272 nm of graphene, and the ultraviolet absorption spectrum is uniformly elevated in...

Embodiment 3、4、6 and 7

[0095] Except for the contents shown in Table 1, graphene was prepared in the same manner as in Example 1.

[0096] The characteristic absorption peak of the reaction system is red-shifted from 230 nm of graphene oxide to 272 nm of graphene, and the ultraviolet absorption spectrum is uniformly elevated in the visible region. The resulting graphene has a carbon atom to oxygen atom ratio greater than 7.

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Abstract

The invention provides a method for preparing graphene and a graphene composite through reducing graphene oxide at the room temperature. The method comprises steps as follows: graphene oxide is dispersed in deionized water and a graphene oxide dispersion liquid is obtained; a catalyst is dispersed in deionized water and a catalyst dispersion liquid is obtained; the graphene oxide dispersion liquid and the catalyst dispersion liquid are mixed and a to-be-reduced liquid is obtained; a reducing agent is dispersed in the to-be-reduced liquid, the to-be-reduced liquid has a reduction reaction at the room temperature, and a coarse product is obtained; the coarse product is separated by a permanent magnet, then a product is subjected to dialysis, and graphene is obtained. The method can also be used for preparing the graphene composite from graphene oxide. The method is mild in condition, is mainly applied to the field of preparation of graphene and the graphene composite at the room temperature and low reducing agent concentration and is particularly suitable for preparation of graphene composites carried by bioactive materials sensitive to temperature and reducing agents.

Description

Technical field [0001] The invention relates to a method for preparing graphene and its composite material, in particular to a method for preparing graphene and its composite material by reducing graphene oxide at room temperature. Background technique [0002] Graphene is a two-dimensional hexagonal honeycomb structure composed of a single layer of sp2 carbon atoms. It is a new carbon material. Graphene has a very high theoretical specific surface area (2630m 2 / g), high-speed electron mobility at room temperature (2×105cm 2 / V·s), good light transmission (transparency of 97.7%), high strength (Young's modulus of 1.0TPa) and thermal conductivity (thermal conductivity of 5000W / m·K at room temperature). Graphene composite materials prepared by combining other nanomaterials with graphene and using graphene as a support and dispersion material can further improve the performance of the corresponding materials. Therefore, graphene and its composite materials have a wide range of pot...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01P2002/85
Inventor 张志颖王玮刘春艳
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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