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Graphene oxide, preparation method and application

A technology of graphene and graphene powder, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of inconvenient large-scale preparation, long cycle period of voltammetry cycle method, etc., and achieve uniform dispersion and storage Stabilize, enhance dispersion uniformity and stability, and enhance the effect of force

Active Publication Date: 2018-06-22
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] CN105417536A discloses a method for preparing graphene with adjustable oxygen content by electrolysis. The method utilizes voltammetric cycling to strip graphene, utilizes ultraviolet light irradiation equipment to control its oxygen content, and utilizes phosphate buffer solution as the electrolytic This method has a great effect on the adjustment of the oxygen content in graphene, but the voltammetric cycle method requires a long cycle, which is not convenient for large-scale preparation, and dialysis is required in the post-treatment process to obtain relatively pure graphite oxide Therefore, it is limited to small-scale preparation in the laboratory

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  • Graphene oxide, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A kind of preparation method of graphene oxide, described method comprises the steps:

[0057] (1) Take two graphite rods with a length of 10 cm and a diameter of 1 cm as the anode and the cathode respectively. The electrolyte is a Tris-HCl buffer solution, and a 20V constant voltage direct current is passed through, and the electrolytic stripping is carried out for 24 hours to obtain a graphene oxide dispersed in the electrolyte. solution; in the Tris-HCl buffer solution, the mol ratio of tris to HCl is 40:1, and the concentration of tris is 0.5mg / mL;

[0058] (2) the graphene oxide dispersion liquid that step (1) obtains is carried out the microporous membrane filtration of 0.22 μ m;

[0059] (3) placing the filtrate of step (2) in a dialysis bag with a molecular weight cut-off of 8000 to 14000 for dialysis for 7 days;

[0060] (4) The graphene oxide aqueous solution obtained in step (3) was frozen into ice cubes, and 512 μg of graphene oxide powder was obtained afte...

Embodiment 2～3

[0066] The difference from Example 1 is only that the voltage of the constant voltage direct current in step (1) is 15V (Example 2) and 30V (Example 3).

Embodiment 2

[0067] 400 μg of graphene oxide was prepared in Example 2, and 2000 μg of graphene oxide was prepared in Example 3.

[0068] The graphene oxide obtained in Example 2 and Example 3 was dispersed in water at a ratio of 0.5 mg / mL, and placed under a 365 nm ultraviolet lamp to irradiate, all of which emitted fluorescence. After being placed for 10 days, the solution was still uniform and had fluorescence. According to atomic force microscope (AFM) observation, the size D85 of the graphene oxide obtained in Example 2 and Example 3 is both 50 nm, and the thickness is about 1 nm.

[0069] X-ray photoelectron spectroscopy test carbon to oxygen ratio is 1:3 (embodiment 2), 1:4 (embodiment 3).

[0070] The water dispersibility was 0.9 mg / mL (Example 2) and 1.1 mg / mL (Example 3).

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Abstract

The invention relates to graphene oxide and a preparation method. The D80 of the graphene oxide is 50nm. The method comprises the following steps of (1), using a graphite rod as an anode, an inert electrode as a cathode and trihydroxymethyl aminomethane-hydrochloric acid as a buffer solution, and carrying out electrolytic stripping under a constant-voltage direct current, so as to obtain grapheneoxide dispersion. The graphene oxide provided by the invention can be stably dispersed into a polar solvent; the preparation method of the graphene oxide, which is provided by the invention, is used for improving the dispersity and the buoyancy of the graphene oxide, and is used for enabling the graphene oxide to be capable of stably existing in the polar solvent; further, the reaction temperatureand the reaction time need to be accurately controlled; the process is simple; the operation is simple and convenient; a device is simple, and the graphene oxide is easily obtained, is further higherin yield and is suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of carbon nanomaterial preparation, in particular to graphene oxide, a preparation method and use. Background technique [0002] Since the discovery of graphene materials, many experimental studies have proved that it has excellent electrical and thermal conductivity, physical and chemical adsorption capabilities, photoluminescence capabilities, chemical catalytic capabilities, etc., making it shine in many fields, especially in energy, The fields of catalysis and microelectronic devices show strong application prospects. Previous studies have shown that the physical, chemical and electro-optical properties of graphene materials are closely related to their size. Compared with large-sized graphene sheets, small-sized graphene materials have better properties. electrical and optical properties. Especially for dot-shaped or sheet-like graphene structures with a size less than 50nm, due to volume limitations, the elect...

Claims

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Application Information

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IPC IPC(8): C01B32/198
CPCC01B2204/04C01B2204/32
Inventor 刘鸣华江建刘宗文
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA