Preparation method of anisotropic graphene foam

A graphene foam and anisotropic technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of complex hard template preparation process, high price, difficult control of process conditions, etc.

Inactive Publication Date: 2012-09-12
上海二工大资产经营有限公司
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  • Abstract
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Problems solved by technology

This method uses a method similar to a hard template (using metal foam as a template) to prepare a three-dimensional graphene foam, but the method of chemical vapor deposition, the process conditions are difficult to control, and it requires very professional personnel to precisely adjust and control. Metal foam such as copper or nickel is used as a hard template. The preparation process of the hard template is relatively complicated and expensive, and some defects that affect the performance of graphene may be formed during the process of removing the hard template by etching.
At present, few self-assembly methods are used to prepare graphene foams. Compared with the hard template method, the self-assembly method has a simpler preparation process and no environmental pollution pressure, and this method can obtain anisotropic The characteristic graphene foam is of great significance for exerting the characteristics of graphene

Method used

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  • Preparation method of anisotropic graphene foam
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Experimental program
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Effect test

Embodiment 1

[0026] Graphite oxide was prepared by the Hummers method: In an ice bath, mix 10g of graphite powder and 5g of sodium nitrate with 230mL of concentrated sulfuric acid, and slowly add 30g of KMnO 4 ; Transfer it to a 35°C water bath for 30 minutes, then gradually add 460mL of deionized water, and continue to react for 40 minutes when the temperature rises to 98°C, the mixture turns from brown to bright yellow, further dilute with water, and use the mass fraction 30% H 2 o 2 Solution treatment, neutralization of unreacted permanganate, centrifugal filtration and repeated washing of the filter cake, and finally vacuum drying to obtain graphite oxide; grind graphite oxide, prepare 100mL of 2mg / mL suspension in water, ultrasonic treatment for 30min, A homogeneous and stable graphene oxide colloidal suspension was obtained; 0.2 g of surfactant polyvinylpyrrolidone (PVP-K30) was added, ultrasonically dissolved, and 1 g of L-cysteine ​​was added to obtain a stable graphene dispersion...

Embodiment 2

[0028]Adopt the Staudenmaier method to prepare graphite oxide: first prepare the mixed solution of fuming nitric acid (27ml) and the vitriol oil (87.5ml) in the three-necked flask, then place the three-necked flask to cool in an ice bath, then 5g graphite powder is stirred (note: the three-neck flask needs to be placed in an ice bath all the time to slow down the reaction speed and avoid explosion), add 55g of sodium chlorate to the above reaction system, and continue stirring for 96 hours. After the reaction is over, the reaction The mixture was filtered and washed to obtain graphite oxide; grind the graphite oxide, prepare 100 mL of a 2 mg / mL suspension in water, and ultrasonicate for 30 minutes to obtain a homogeneous and stable graphene oxide colloidal suspension; add 0.2 g of surfactant sodium polyacrylate , ultrasonically dissolved, and 2 g of sodium citrate was added; the dispersion was heated to 95° C. for 4 hours, and then rapidly cooled to obtain a graphene foam.

Embodiment 3

[0030] Graphite oxide was prepared by the modified Brodie method: 10 g of graphite powder and 85 g of sodium chlorate were mixed with 200 mL of fuming nitric acid in an ice bath, and stirred at room temperature for 24 hours. After the reaction is finished, centrifugally filter and repeatedly wash the filter cake, purify, and finally vacuum-dry it to obtain graphite oxide. Grind graphite oxide, prepare 100 mL of a 2 mg / mL suspension in water, and ultrasonically treat it for 30 min to obtain a homogeneous and stable graphene oxide colloidal suspension. Add 2 g of ascorbic acid, ultrasonically dissolve to obtain a stable graphene dispersion. The graphene dispersion was irradiated with microwaves for 15 minutes, and the graphene foam could be obtained in 12 hours after cooling.

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Abstract

The invention relates to a preparation method of anisotropic graphene foam. The method comprises the following steps of: (1) preparing graphite oxide; (2) preparing a graphene oxide dispersion solution, namely dispersing the graphite oxide prepared in the step (1) into a solution to prepare the graphene oxide dispersion solution; (3) preparing a graphene dispersion solution, namely adding a surfactant or a reducing agent with certain surface activity into the dispersion solution of the step (2) to be used as a protection agent; and preparing the graphene dispersion solution through chemical liquid-phase reduction; and (4) preparing the anisotropic graphene foam: damaging a previous graphene stable system to self-assemble the graphene into the anisotropic graphene foam. The graphene foam prepared by the method is composed of at least one layer of graphene structure unit and has anisotropies of a structure and a property in a graphene growth direction and in a direction which is vertical to the growth direction; the specific surface area of the anisotropic graphene foam is 200-2000 m<2>/g; and the heat conductivity difference in the graphene growth direction and in the direction which is vertical to the growth direction reaches to two magnitudes.

Description

technical field [0001] The invention relates to a preparation method of anisotropic graphene foam, which belongs to the technical field of new materials. Background technique [0002] The new material industry has become one of the fastest-growing high-tech industries since the 21st century, and it is also a technological highland that countries are competing to occupy. A series of major breakthroughs have been made in the research of new carbon materials represented by graphene. On October 5, 2010, Professor Andre Geim, a physicist at the University of Manchester, and Konstantin Novosho Professor Konstantin Novoselov won the 2010 Nobel Prize in Physics for his research on graphene and revealing its properties. [0003] Graphene is a simple carbon substance composed of carbon atoms arranged in a hexagonal lattice, and its structure is very stable. Studies have shown that graphene has high electron mobility, which can make electrodes thinner and more transparent. Its good e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/192
Inventor 于伟谢华清陈立飞黎阳
Owner 上海二工大资产经营有限公司
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