Method for realizing large-scale preparation of monolayer oxidized graphene

A technology for large-scale preparation of graphene, which is applied in the field of large-scale preparation of single-layer graphene oxide, can solve problems such as unsuitable for popularization and application, good dispersion and good film-forming properties, and achieve low raw material cost, good reproducibility, The effect of easy operation

Inactive Publication Date: 2009-12-02
HUBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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
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Method used

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  • Method for realizing large-scale preparation of monolayer oxidized graphene
  • Method for realizing large-scale preparation of monolayer oxidized graphene
  • Method for realizing large-scale preparation of monolayer oxidized graphene

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0025] Embodiment 1, the first step, preparation of graphite oxide: 2 grams of natural graphite flakes were dispersed under stirring into the mixed acid of 35 milliliters of concentrated sulfuric acid and 18 milliliters of concentrated nitric acid which were stirred and cooled in an ice bath for 15 minutes. Slowly add potassium chlorate 22g then, whole reaction system keeps open, and is equipped with tail gas absorption device. The reaction lasted 96 hours. After the reaction was finished, the mixture was washed with 1 liter of deionized water and filtered until neutral.

[0026] The second step, dispersing and peeling: add the washed graphite oxide to deionized water immediately, dilute to a concentration of 0.5 g / L, and use ultrasonic waves to disperse and peel for 1 hour after dilution. Then filter to remove unreacted graphite, collect the filtrate to obtain as figure 2 The aqueous solution of graphene oxide shown in a, the solution in the small beaker is: the solution d...

Embodiment 2

[0028] Embodiment 2, by the preparation method of embodiment 1, just described oxidizing agent is 10 gram potassium permanganate, obtain as follows equally image 3 , 4 , 5, 6, and 7 show the results.

Embodiment 3

[0029] Embodiment 3, by the preparation method of embodiment 1, just described oxidizing agent is 15 gram potassium persulfates, equally obtains as image 3 , 4 , 5, 6, and 7 show the results.

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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...

Claims

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Application Information

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IPC IPC(8): C01B31/00
Inventor 王世敏万丽王敬超王贤保董兵海
Owner HUBEI UNIV
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