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Preparation method of large-dimension graphene oxide and large-dimension graphene oxide obtained by method

A large-size graphene technology, which is applied in the preparation of large-size graphene oxide and the field of large-size graphene oxide, can solve the problems of small size, low yield, and long time consumption, and achieve large size, uniform structure, and rapid peeling Effect

Inactive Publication Date: 2019-03-29
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of long time consumption, low yield and small size in the above-mentioned prior art, the present invention aims to provide a method for preparing large-size graphene oxide and the resulting large-size graphene oxide

Method used

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  • Preparation method of large-dimension graphene oxide and large-dimension graphene oxide obtained by method

Examples

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Effect test

Embodiment 1

[0023] Graphite paper with a length of 9cm, a weight of 0.5g, and a thickness of 1mm (prepared from expanded graphite with a radial dimension of 500 μm) was used as the anode, a platinum sheet of 4cm*2cm*0.15mm was used as the cathode, and concentrated sulfuric acid was used as the electrolyte. The voltage was constant at 5V, and the reaction was carried out at room temperature. The graphite was electrochemically intercalated and exfoliated for 40 minutes, and separated with a 150-mesh nylon sieve to obtain electrochemically intercalated graphite.

[0024] Put the intercalation graphite into the mixture of 23ml concentrated sulfuric acid and 1g potassium permanganate, 35°C, 150rpm magnetic stirring for 1h, filter and wash with deionized water, add 500ml deionized water, stir for 30min under 150rpm magnetic stirring , to obtain a uniform graphene oxide dispersion.

[0025] Such as figure 2 The scanning electron microscope image (SEM) results shown show that the obtained graph...

Embodiment 2

[0027] Graphite paper with a length of 9cm, a weight of 0.5g, and a thickness of 1mm (prepared from expanded graphite with a radial dimension of 1500 μm) was used as the anode, a platinum sheet of 4cm*2cm*0.15mm was used as the cathode, and concentrated sulfuric acid was used as the electrolyte. The voltage was constant at 5V, and the reaction was carried out at room temperature. The graphite was electrochemically intercalated and exfoliated for 40 minutes, and separated with a 150-mesh nylon sieve to obtain electrochemically intercalated graphite.

[0028] Put the intercalation graphite into the mixture of 23ml concentrated sulfuric acid and 1g potassium permanganate, 35°C, 150rpm magnetic stirring for 1h, filter and wash with deionized water, add 500ml deionized water, stir for 30min under 150rpm magnetic stirring , to obtain a uniform graphene oxide dispersion, with an average radial size of more than 80 microns, and a single-layer and double-layer ratio of more than 80%.

Embodiment 3

[0030]Graphite paper with a length of 9cm, a weight of 0.5g, and a thickness of 1mm (prepared from expanded graphite with a radial dimension of 5000 μm) was used as the anode, a platinum sheet of 4cm*2cm*0.15mm was used as the cathode, and concentrated sulfuric acid was used as the electrolyte. The voltage was constant at 5V, and the reaction was carried out at room temperature. The graphite was electrochemically intercalated and exfoliated for 40 minutes, and separated with a 150-mesh nylon sieve to obtain electrochemically intercalated graphite.

[0031] Put the intercalation graphite into the mixture of 23ml concentrated sulfuric acid and 1g potassium permanganate, 35°C, 150rpm magnetic stirring for 1h, filter and wash with deionized water, add 500ml deionized water, stir for 30min under 150rpm magnetic stirring , to obtain a uniform graphene oxide dispersion, with an average radial size of more than 80 microns, and a single-layer and double-layer ratio of more than 80%.

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Abstract

The invention relates to a preparation method of large-dimension graphene oxide. The method comprises the following steps of using graphite paper as an anode; using a platinum sheet as a cathode; performing electrochemical pretreatment in electrolyte; performing intercalation on an anode material; peeling graphite; adding the materials into a mixed solution of an oxidizing agent and acid for oxidization reaction; peeling the graphene oxide under the oscillator oscillation or magnetic power stirring conditions, so that the multilayer graphene oxides are peeled into single-layer and few-layer graphene oxides and are dispersed into deionized water to form large-dimension graphene oxide dispersion liquid; performing centrifugal separation to obtain graphene oxide slurry; performing freeze drying treatment to obtain large-dimension graphene oxide powder. The invention also provides the large-dimension graphene oxide obtained by the preparation method. The electrochemical intercalation graphene is used as raw materials to perform oxidization reaction to realize the fast oxidization on the graphene; through natural settling cleaning and mild mechanical peeling, the fast peeling on the large-dimension graphene oxide is realized; the characteristics of high efficiency, high yield and low cost are achieved.

Description

technical field [0001] The invention relates to the preparation of graphene materials, more particularly to a method for preparing large-size graphene oxide and the large-size graphene oxide obtained therefrom. Background technique [0002] Graphene, a two-dimensional nano-carbon material with many excellent properties (such as ultra-high specific surface area, electrical conductivity, thermal conductivity and mechanical strength, etc.), has been used for the first time by the A.K.Geim group of the University of Manchester in 2004. After the method of exfoliating graphite is prepared, it has broad development and application prospects in the fields of composite materials, electronics, information, energy, biology, and medicine. With the research on graphene, many methods for preparing graphene have been produced, among which, the oxidation-reduction method is a relatively common method for preparing graphene materials with low cost and high efficiency. Reduction method to o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/198
CPCC01B2204/32C01B32/198
Inventor 丁古巧周久顺
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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