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Method for preparing large-area graphene sponge

A graphene sponge, large-area technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as limited instruments, limited templates, and inability to prepare large areas, and achieve high adsorption capacity and cost. Low, achieve the effect of large area preparation

Active Publication Date: 2013-05-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have their own advantages, but they have common disadvantages: they cannot be prepared in a large area, many are limited by the preparation equipment, and others are limited by the template used

Method used

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  • Method for preparing large-area graphene sponge
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  • Method for preparing large-area graphene sponge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Ethanol is used as a solvent, and the substrate temperature is 40°C to prepare a graphene sponge

[0017] In the first step, 100 mg of graphite oxide was weighed, poured into a beaker filled with 200 ml of ethanol, and ultrasonicated for 1 hour to obtain a uniform graphene oxide suspension.

[0018] In the second step, the glass substrate is ultrasonically cleaned with alcohol, then ultrasonically cleaned with acetone, and finally ultrasonically cleaned with deionized water, dried and placed on a heating table, and the temperature is heated to 40°C.

[0019] In the third step, the graphene oxide dispersion is poured into the spray gun, and the dispersion is sprayed onto the heated glass substrate by the spray gun.

[0020] The fourth step is to put the obtained graphene oxide sponge into a container containing hydrazine hydrate, seal it well, heat it to 95°C, and use hydrazine vapor to reduce it to finally obtain a graphene sponge. figure 1 For the cross-sec...

Embodiment 2

[0021] Embodiment 2: ethanol is solvent, and substrate temperature is 70 ℃

[0022] The preparation method is basically the same as in Example 1, except that the temperature of the substrate is changed from 40°C to 70°C, figure 2 It is a scanning electron microscope picture of the obtained graphene sponge. It can be seen that the sponge is also a porous structure, and the graphene sheet is bent.

Embodiment 3

[0023] Embodiment 3: ethanol is solvent, substrate temperature is 55 ℃

[0024] The preparation method is basically the same as in Example 1, except that the temperature of the substrate is changed from 40°C to 55°C, and the temperature at which the graphene oxide sponge is reduced is 110°C. The obtained sponge structure is as follows: image 3 As shown, it is also a porous structure.

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Abstract

The invention discloses a method for preparing a large-area graphene sponge. The method comprises the following steps: adding graphite oxide into a solvent, performing ultrasonic dispersion to form a graphite oxide suspension, then pouring the suspension into a spray gun, then placing a substrate on a heating table, regulating the temperature of the substrate, then spraying the graphite oxide suspension onto the heated substrate by utilizing the spray gun to further get graphite oxide sponge and finally reducing the graphite oxide sponge to get the graphene sponge. The area of the graphene sponge obtained by the method disclosed by the invention can be made to be very large, which far exceeds other methods; in addition, the sponge has very good adsorption capability to oil and the organic solvents. The method has the advantages of simplicity, easiness in operation and very low cost.

Description

technical field [0001] The invention relates to a method for preparing a large-area graphene sponge. Background technique [0002] In recent years, three-dimensional porous graphene has been widely studied due to its great potential in energy and environmental protection (Z.Q.Niu, J.Chen, H.H.Hng, J.Ma, X.D.Chen, Adv.Mater.2012,24,4144 ;H.C.Bi,X.Xie,K.B.Yin,Y.L.Zhou,S.Wan,et al.Adv.Funct.Mater.2012,22,4421;Y.X.Xu,Q.O.Wu,Y.Q.Sun,H.Bai,G.Q.Shi,ACS Nano 2010, 4, 7358). The method for preparing this porous graphene mainly contains: freeze-drying method (X.W.Yang, J.W.Zhu, L.Qiu, D.Li, Adv.Mater.2011,23,2833), chemical vapor deposition method (Z.P.Chen, W.C.Ren, L.B.Gao, B.L.Liu, S.F.Pei, H.M.Cheng, Nat.Mater.2011, 10, 424), fermentation method (Z.Q.Niu, J.Chen, H.H.Hng, J.Ma, X.D.Chen, Adv.Mater.2012, 24, 4144 ). These methods have their own advantages, but they have common disadvantages: they cannot be prepared in a large area, many are limited by the preparation equipment,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/192
Inventor 孙立涛毕恒昌万树吴幸尹奎波谢骁徐峰周奕龙
Owner SOUTHEAST UNIV
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