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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 effects of simple and easy preparation method, easy control of reaction process, and easy popularization and use

Inactive Publication Date: 2011-08-17
NORTHWEST UNIV(CN)
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  • Summary
  • 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 was oxidized by Hummers' method (1. Kovtyukhova, N. I.; Ollivier, P. J.; Martin, B. R.; Mallouk, T. E.; Chizhik, S. A.; Buzaneva, E. V.; Gorchinskiy, A. D. 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, the obtained solution was yellow or tan, and the unexfoliated graphite oxide was removed by centrifugation, and 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 water, then add 125 μL of 14 wt% acetone oxime aqueous solution, and reflux at 100 °C for 3 hours to obtain a black graphene aqueous solution.

Embodiment 2

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

[0025] like figure 1 Shown, (a) is brownish yellow graphene oxide solution. (b) and (c) are graphene solutions obtained by chemically reducing graphene oxide using acetone oxime and hydrazine hydrate as reducing agents, respectively, and its color changes from the original brownish yellow to the current black. (d) and (e) are graphene solutions that have been placed for 2 months, and they still show good dispersion without significant sedimentation.

[0026] like figure 2 As shown, (a) is the UV-vis spectrum of graphene oxide, which shows the π→π of C-C bond at 231 nm * the absorption peak. (b) and (c) are the UV-vis spectra of the graphene solution obtained by reduction with acetone oxime (b) and hydrazine hydrate (c), respectively. It can be seen that when graphen...

Embodiment 3

[0035] Similar to Example 1, the difference is that 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 those synthesized 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 chemically reducing graphene oxide, in particular to a method for preparing stable graphene aqueous solution by using a green reducing agent oxime to reduce graphene oxide. Background technique [0002] Graphene (graphene) is a new carbonaceous material that is tightly packed into a two-dimensional honeycomb lattice structure by a single layer of carbon atoms. 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 used in high-performance nanoelectronic devices, sensors, nanocomposites, batteries and supercapacitors, field emission m...

Claims

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Application Information

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