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Cobaltous oxide nanocrystal-graphene composite material, and preparation method and application thereof

A technology of cobaltous oxide nano and composite materials, which is applied in chemical instruments and methods, nanotechnology, nanotechnology, etc., and can solve the problems of easy aggregation of nano-CoO nanocrystals and impurities in nano-CoO materials

Inactive Publication Date: 2017-01-04
BEIJING NORMAL UNIVERSITY +1
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  • Claims
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Problems solved by technology

[0005] The embodiment of the present invention discloses a cobaltous oxide nanocrystal-graphene composite material, its preparation method and application, so as to solve the problems that existing nano-CoO materials contain impurities and nano-CoO nanocrystals are easy to agglomerate

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  • Cobaltous oxide nanocrystal-graphene composite material, and preparation method and application thereof
  • Cobaltous oxide nanocrystal-graphene composite material, and preparation method and application thereof
  • Cobaltous oxide nanocrystal-graphene composite material, and preparation method and application thereof

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[0028] The embodiment of the present invention also discloses a preparation method of the cobaltous oxide nanocrystal-graphene composite material, which may include the following steps:

[0029] adding graphite oxide into N-methylpyrrolidone and performing dispersion treatment to obtain a mixed solution;

[0030] Add cobalt acetylacetonate and octadecylamine into the mixture, heat the mixture to 120-140°C under stirring, keep it warm for more than 30 minutes, and then continue to heat to 190-202°C under stirring , keep warm for more than 2 hours;

[0031] adding an organic solvent to quench the reaction, isolating the reaction product, and washing and drying the reaction product;

[0032] Wherein, the ratio of the cobalt acetylacetonate to the graphite oxide is 1mol: (20-40) g, the mass ratio of the graphite oxide to the octadecylamine is 1: (12.5-50), and the N-methyl The ratio of base pyrrolidone to the graphite oxide is 1L:1g.

[0033] Graphene is a two-dimensional cryst...

Embodiment 1

[0050] Add 40 mg of graphite oxide (GO) to 40 mL of N-methylpyrrolidone, and ultrasonically disperse for about 2 hours to obtain a uniformly dispersed brown mixed liquid;

[0051] 2mmol cobalt acetylacetonate (Co(acac) 2 ) and 0.5 g of octadecylamine were added to the above brown mixed solution, heated to 120° C. under magnetic stirring, and kept for 30 minutes, and then continued to be heated to 202° C. under magnetic stirring, and kept for 2 hours;

[0052] The reaction was quenched by adding 20 mL of ethanol, and then centrifuged to separate the reaction product, which was washed alternately with n-hexane and acetone for 3 times, and then the product was vacuum-dried at 40°C.

Embodiment 2

[0054] Add 40 mg of graphite oxide (GO) to 40 mL of N-methylpyrrolidone, and ultrasonically disperse for about 2 hours to obtain a uniformly dispersed brown mixed liquid;

[0055] 1mmol cobalt acetylacetonate (Co(acac) 2 ) and 1.4 g of octadecylamine were added to the above brown mixed liquid, heated to 125°C under magnetic stirring, and kept for 40 minutes, and then continued to be heated to 190°C under magnetic stirring, and kept for 3 hours;

[0056] The reaction was quenched by adding 20 mL of ethanol, and then centrifuged to separate the reaction product, which was washed alternately with n-hexane and acetone for 4 times, and then the product was vacuum-dried at 40°C.

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Abstract

The embodiment of the invention discloses a cobaltous oxide nanocrystal-graphene composite material. Graphene in the composite material is flaky, and cobaltous oxide nanocrystals are dispersed on the graphene. The embodiment of the invention also discloses a preparation method of the composite material and application of the composite material in the catalysis field. According to the invention, the graphene is used as a substrate, and the cobaltous oxide nanocrystal-graphene composite material is obtained through one-step reduction by a thermal decomposition method; and the composite material contains no Co3O4 or elementary Co, pure CoO is obtained, and the CoO nanocrystals are uniformly dispersed and have no aggregation phenomenon. Thus, the composite material has favorable wave-absorbing property and magnetic property, and the catalytic property is greatly improved.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a cobaltous oxide nanocrystal-graphene composite material, a preparation method and application thereof. Background technique [0002] As a typical transition metal oxide, cobaltous oxide (CoO) has two typical stable phases, namely the deep yellow rock-salt phase (space group Fm3m) and the green wurtzit phase (space group Fm3m) P6 3 mc). CoO is an excellent magnetic material, and the transition between paramagnetism and diamagnetism occurs near its Neel temperature (298K). Bulk CoO materials are insulating antiferromagnetic materials, but nanostructured CoO (nano-CoO) materials exhibit good ferromagnetism or superparamagnetism. Nano-CoO materials have better physical and chemical properties, and they have a wide range of applications in lithium-ion batteries, electromagnetic wave absorption, catalysis, gas transmission, and magnetic data storage devices. [0003] Among the...

Claims

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Application Information

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IPC IPC(8): B01J23/75B82Y30/00
CPCB01J23/75B82Y30/00
Inventor 杨晓晶吴红孙根班
Owner BEIJING NORMAL UNIVERSITY
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