Method for realizing large-scale preparation of monolayer oxidized graphene

Abstract

The invention relates to a method used for realizing large-scale preparation of monolayer oxidized graphene. The method comprises the following steps: oxidizing natural crystalline flake graphite by an oxidant to obtain oxidized graphite; after ultrasonic stripping, carrying out filtration to remove unreacted graphite and obtain the aqueous solution of oxidized graphene; and adding a flocculating agent to obtain oxidized graphene solid after settlement, filtration and drying. The method can easily separate the oxidized graphene solid from aqueous dispersion solution through flocculating settlement, thereby realizing large-scale preparation of graphene; moreover, the method has cheap and accessible raw materials, easy operation, simple process and good reproducibility, and is suitable for large-scale industrial production. The monatomic oxidized graphene prepared by the method can be used as flake reinforced phase of composite materials to prepare materials with high mechanical property and barrier property; moreover, the oxidized graphene can also be used for preparing fingerprint collecting materials, and the like. Graphene, namely the reduction product of the oxidized graphene can be used for constructing two-dimensional photoelectron components such as nano computer chips, solar battery electrodes and field effect transistors and the like.

Description

technical field [0001] The invention relates to a method for large-scale preparation of single-layer graphene oxide. Background technique [0002] In 2004, Geim, a professor of physics at the University of Manchester in the United Kingdom, used a very simple method to peel off and observe a single-layer graphene crystal (Geim, A.K.et al.Science, 306, 666 (2004)), which aroused a new interest in the scientific community. A round of "carbon" craze. The theoretical specific surface area of ​​graphene is as high as 2600m2 / g (Chae, H.K.etal.Nature, 427,523 (2004)), has outstanding thermal conductivity (3000W / (m K)) and mechanical properties (1060GPa) (Schadler, L.S. et al. Appl Phys Lett, 73, 3842 (1998)), and high-speed electron mobility (15000 cm2 / (V·s)) at room temperature (Zhang, Y. et al. Nature, 438, 201 (2005)). The special structure of graphene makes it have a series of properties such as perfect quantum tunneling effect, half-integer quantum Hall effect and never-disap...

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Problems solved by technology

However, the graphene oxide obtained by this method is a two-dimensional sheet-like structure with good film-forming properties and good dispersibility in water. seperate

Especially for large-scale industrial preparation and treatment, these methods are high in cost and low in efficiency, and are not suitable for popularization and application.

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