Reduction method for graphene oxide

A technology of graphene and stone oxide, which is applied in the field of preparing stable graphene aqueous solution, can solve problems such as environmental pollution, and achieve the effect of simple and easy preparation method, low cost, and easy popularization and use

Inactive Publication Date: 2013-01-02
NORTHWEST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a green method for preparing graphene by reducing graphene oxide to address the problems of environmental pollution caused by the use of highly toxic chemical reducing agents in the existing chemical reduction graphene oxide technology

Method used

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  • Reduction method for graphene oxide
  • Reduction method for graphene oxide
  • Reduction method for graphene oxide

Examples

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Embodiment 1

[0021] 1) Natural graphite is oxidized by Hummers' method (1. Kovtyukhova, NI; Ollivier, PJ; Martin, BR; Mallouk, TE; Chizhik, SA; Buzaneva, EV; Gorchinskiy, AD Layer-by-layer assembly of ultrathin composite films from micron-sized graphite oxide sheets and polycations. Chem. Mater. 1999, 11, 771–778. 2. Hummers, W. S.; Offeman, R. E. Preparation of graphite oxide. J. Am. Chem. Soc. 1958, 80, 1339.), the obtained graphite oxide was prepared by ultrasonic dispersion method to prepare graphene oxide aqueous solution, and the obtained solution was yellow or yellow-brown. The unstripped graphite oxide was removed by centrifugation. The concentration of graphene oxide was 0.05 wt%.

[0022] 2) Take 50ml of 0.05 wt% graphene oxide solution, adjust the pH to about 10 with ammonia, then add 125 μL of 14 wt% acetoxime aqueous solution, and reflux at 100 ℃ for 3h to obtain black graphene aqueous solution.

Embodiment 2

[0024] Similar to the synthesis method in Example 1, the difference is that the same amount of hydrazine hydrate is used instead of acetoxime, and the graphene aqueous solution is prepared by reduction.

[0025] Such as figure 1 As shown, (a) is a brown-yellow graphene oxide solution. (b) and (c) are graphene solutions obtained by chemical reduction of graphene oxide using acetoxime and hydrazine hydrate as reducing agents, and the color of the graphene solution has changed from the original brownish yellow to the current black. (d) and (e) are graphene solutions that have been left for 2 months. They still exhibit good dispersibility without significant sedimentation.

[0026] Such as figure 2 As shown, (a) is the UV-vis spectrum of graphene oxide, which shows π→π of C-C bond at 231 nm * The absorption peak. (b) and (c) are the UV-vis spectra of graphene solutions obtained by reduction using acetoxime (b) and hydrazine hydrate (c), respectively. It can be seen that when the gra...

Embodiment 3

[0035] Similar to Example 1, the difference is that the graphene oxide was purchased from Nanjing Xianfeng Nano Material Technology Co., Ltd., and a black graphene aqueous solution was prepared according to the same reduction method. The characterization results were similar to the synthesized product in Example 1.

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Abstract

The invention discloses a reduction method for graphene oxide. The method comprises the following steps: using acetone oxime, acetaldoxime or methyl ethyl ketoxime as a reducing agent, and then preparing the graphene by reducing the graphene oxide in a graphene oxide aqueous solution the pH value of which is 6-10, wherein the reaction temperature is 80-100 DEG C and the mass ratio of graphene oxide to the reducing agent acetone oxime, acetaldoxime or methyl ethyl ketoxime is 1: (0.2-5). The method is characterized in that the oximido having lower toxicity is used as the reducing agent and thegraphene is acquired by reducing the graphene oxide by using a chemical reduction method. The preparation method is simply and easily performed, the reaction process is easily controlled, no special requirement for equipment exists, the cost is low, the pollution is free, and the method is easily popularized and used.

Description

Technical field [0001] The invention relates to a method for preparing graphene by chemical reduction of graphene oxide, in particular to a method for preparing a stable graphene aqueous solution by reducing graphene oxide with a green reducing agent oxime. Background technique [0002] Graphene is a new carbonaceous material composed of a single layer of carbon atoms closely packed into a two-dimensional honeycomb lattice structure. It is used to construct other dimensional carbon materials (such as zero-dimensional fullerenes, one-dimensional carbon nanotubes, The basic unit of three-dimensional graphite). Due to its unique two-dimensional structure and perfect crystal structure, graphene contains rich and novel physical phenomena, which provides an ideal platform for the study of quantum electrodynamic phenomena, and has important theoretical research value; at the same time, graphene has excellent Its electrical, thermal and mechanical properties are expected to be widely us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04
Inventor 郭慧林苏鹏
Owner NORTHWEST UNIV
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