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Method for in-situ preparation of small-size metal oxide on graphene

An in-situ preparation and graphene technology, applied to chemical instruments and methods, lead oxide, carbon compounds, etc., can solve the problems of easy residual impurities, cumbersome process, complicated steps, etc., and achieve high efficiency and purity of the final product, simple operation, avoid The effect of uneven large particles

Active Publication Date: 2018-01-23
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] At present, the commonly used methods for combining metal oxides and graphene include hydrothermal method, solvothermal method, chemical vapor deposition method, sol-gel method, etc., but the size of metal oxides prepared by these methods is generally 10~ 30nm and the particle distribution is not uniform. Even if the types and dosages of reducing agents, Capping reagents, and linking agents are precisely controlled, the size of the prepared metal oxides is mostly 3-10nm, and it is inevitable to use in the preparation process. Various chemical agents are prone to residual impurities, complicated steps and cumbersome process

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  • Method for in-situ preparation of small-size metal oxide on graphene
  • Method for in-situ preparation of small-size metal oxide on graphene
  • Method for in-situ preparation of small-size metal oxide on graphene

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[0022] Specifically, the preparation method of the graphene-metal ion reaction solution may include: mixing graphene, graphene oxide or reduced graphene oxide with a metal ion solution (the metal ion solution may be an acetate solution), and the graphite Graphene-metal ion reaction liquid is obtained after adsorption and complexation of metal ions by ene, graphene oxide or reduced graphene oxide. The metal ion can be Cu 2+ , Zn 2+ 、Co 2+ 、Ni 2+ , Mn 2+ , Pb 2+ at least one of the The graphene oxide or graphene can be the graphene oxide or graphene prepared by the Hummers method in the prior art.

[0023] Further, as Figure 4 As shown, the principle of the method for preparing small-sized metal oxides in situ on graphene provided by the present invention is as follows: because graphene, graphene oxide (i.e. GO) and reduced graphene oxide (i.e. RGO) all have abundant functional groups , large specific surface area, strong ability to transport electrons, and has a stable...

Embodiment 1

[0031] A method for preparing small-sized metal oxides in situ on graphene, comprising the following steps:

[0032] Step A1, mixing reduced graphene oxide (ie RGO) with a zinc acetate solution to obtain a flocculent mixed solution after the reduced graphene oxide has adsorbed and complexed zinc ions.

[0033] Step B1, using a laser with a wavelength of 200-600nm to irradiate the flocculent mixed solution after the reduced graphene oxide is adsorbed and complexed with zinc ions, and the irradiation time is 15 minutes, so as to obtain zinc oxide supported by reduced graphene oxide Nanocomposites (ie ZnO-RGO nanocomposites).

Embodiment 2

[0035] A method for preparing small-sized metal oxides in situ on graphene, comprising the following steps:

[0036] Step A2, mixing the reduced graphene oxide (ie RGO) with the manganese acetate solution to obtain a flocculent mixed solution after the reduced graphene oxide has adsorbed and complexed manganese ions.

[0037] Step B2, using a laser with a wavelength of 200-600nm to irradiate the flocculent mixed solution after the reduced graphene oxide is adsorbed and complexed with manganese ions, and the irradiation time is 30 minutes, so as to obtain manganese oxide supported by reduced graphene oxide nanocomposites (i.e. MnO x -RGO nanocomposites).

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Abstract

The invention discloses a method for in-situ preparation of small-size metal oxide on graphene. The method comprises the following step: radiating a graphene-metal ionic reaction liquid by using laserof which the wavelength is 200-600nm (the radiation times are different according to nucleation speeds of different oxides, generally 15 minutes to 2 hours), so as to obtain small-size metal oxides of which the granularity is less than 3nm on graphene through in-situ preparation, wherein the graphene-metal ionic reaction liquid is at least one of a flocculent mixed solution generated after metalions are adsorbed and complexed with graphene, a flocculent mixed solution generated after metal ions are adsorbed and complexed by graphene oxide, and a flocculent mixed solution generated after metal ions are adsorbed and complexed by reduced graphene oxide. The method is not only small in size of metal oxides (the granularity is less than 3nm), uniform in dispersion, free of chemical agents such as reducing agents and stabilizers, free of raw material amount requirement, simple to operate and green and efficient.

Description

technical field [0001] The invention relates to the technical field of preparing metal oxides on graphene, in particular to a method for preparing small-sized metal oxides on graphene in situ (small-sized metal oxides in the present invention refer to metal oxides with a particle size <3nm) . Background technique [0002] Metal oxides have unique physical and chemical properties, and have the advantages of low cost, environmental friendliness, and wide distribution, so they are widely used in photocatalysis, electrocatalysis, biology and other fields. The electron mobility of graphene at room temperature can reach 15000 cm 2 / V·s, and has perfect quantum tunneling effect, large specific surface area (2600m 2 / g) and half-integer quantum Hall behavior, so metal oxide-graphene nanocomposites have received extensive attention. [0003] Combining metal oxides with graphene can not only improve the electrical conductivity of metal oxides, but also allow nanoparticles to be ...

Claims

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Application Information

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IPC IPC(8): C01B32/194C01G9/02C01G45/02C01G51/04C01G53/04C01G21/02C01G3/02B82Y30/00
Inventor 梁长浩叶一星张豪张超
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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