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A kind of method that graphene oxide reduction prepares graphene material

A technology of graphene and graphene, which is applied in the field of efficient reduction of graphene oxide and efficient preparation of graphene materials, can solve problems such as high cost and environmental pollution, and achieve the effects of simple method, low-cost reduction, excellent electrical conductivity and mechanical properties

Active Publication Date: 2011-12-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a new method for preparing graphene materials by reduction of graphene oxide (GrapheneOxide, GO), to solve the problems of environmental pollution and high cost in the prior art

Method used

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  • A kind of method that graphene oxide reduction prepares graphene material
  • A kind of method that graphene oxide reduction prepares graphene material
  • A kind of method that graphene oxide reduction prepares graphene material

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Experimental program
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Embodiment 1

[0025] The sample to be reduced is a self-assembled GO film, and its length × width × thickness=12mm × 5mm × 0.05mm; the reducing agent is hydroiodic acid with a concentration of 55% (mass fraction); the reduction temperature is 80°C; the reduction time is 1 hour, The size of the obtained graphene film is 12mm×5mm×0.03mm. After reduction, the film changed from an insulating state to a high conductance state, and the bulk conductivity was 298S / cm. Due to the increase in electrical conductance, the reduced film exhibits a bright metallic luster (see attached figure 2 ). At the same time, the reduction process maintains the integrity and flexibility of the film; the mechanical performance test before and after reduction shows that the tensile strength of the film is significantly improved. The tensile strength of the film before reduction is 128MPa, and the tensile strength after reduction increases to 167MPa. The increase is about 30% (see attached image 3 ). X-ray photoel...

Embodiment 2

[0027] The sample to be reduced is a self-assembled GO film, and its length × width × thickness=12mm × 5mm × 0.05mm; the reducing agent is hydrobromic acid with a concentration of 40% (mass fraction); the reduction temperature is 100°C; the reduction time is 5 hours, The size of the obtained graphene film is 12mm×5mm×0.04mm. The volume conductivity of the film after reduction was 258S / cm, and the tensile strength increased from 122MPa to 147MPa. The C / O of the GO film before reduction was 2.4, and the C / O increased to 10.8 after reduction (see attached Figure 5 ).

Embodiment 3

[0029] The sample to be reduced is GO paper obtained by filtration, and its length×width×thickness=12mm×5mm×0.5mm; the reducing agent is thionyl chloride liquid; the reduction temperature is 70°C; the reduction time is 24 hours, and the obtained graphene paper The specification is 12mm×5mm×0.45mm. After reduction, the volume conductivity of the film is 18S / cm, and the tensile strength increases from 112MPa to 124MPa. The C / O of GO paper before reduction was 2.3, and the C / O increased to 4.6 after reduction (see attached Figure 6 ).

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Abstract

The invention relates to the field of graphene materials, in particular to a novel method for preparing a graphene material by reducing graphene oxide (GO). The method is suitable for reducing various graphene-oxide-based powder and thin-film materials. In the method, a graphene oxide product is soaked for 10 seconds-24 hours in a halogenating reagent, such as hydroiodic acid, hydrobromic acid, sulfoxide chloride and the like, in a temperature range from minus 5 DEG C to 140 DEG C, and is taken out and dried, thereby the reduction of the graphene oxide material is completed; and the graphene material obtained after reduction has an excellent electric conduction performance and can maintain the flexibility of thin-film products. The method is simple and is easy to control, can realize the reduction on lots of graphene materials at low temperature with high efficiency and low cost and is beneficial to solving of the problems of environment pollution, high cost and the like in the prior art.

Description

technical field [0001] The invention relates to the field of graphene, in particular to a new method for preparing graphene materials by reduction of graphene oxide (Graphene Oxide, GO), which efficiently prepares graphene materials by efficiently reducing graphene oxide. Background technique [0002] Since its discovery in 2004, graphene has attracted much attention as a new type of carbon material. It is a completely sp 2 The two-dimensional crystal material composed of hybrid carbon atoms with a thickness of only a single atomic layer has excellent properties such as high light transmission and electrical conductivity, high specific surface area, high strength and flexibility, and is expected to be used in high-performance nanoelectronic devices. , photoelectric devices, gas sensors, composite materials, field emission materials and energy storage and other fields have been widely used. However, the large-scale preparation of high-quality graphene is still facing diffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 杜金红裴嵩峰赵金平任文才成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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