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Method for preparing cobalt/graphene composite material by alcohol thermal method

A technology of composite materials and graphene, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of many process steps and high cost, and achieve simple process, good crystallinity and dispersibility Good results

Inactive Publication Date: 2011-11-02
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current methods for preparing metal / graphene composites mainly have the following defects: more process steps and higher cost
There is no report on the preparation of cobalt / graphene composites by alcohol thermal method

Method used

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  • Method for preparing cobalt/graphene composite material by alcohol thermal method
  • Method for preparing cobalt/graphene composite material by alcohol thermal method
  • Method for preparing cobalt/graphene composite material by alcohol thermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 55mg of graphite oxide and disperse in 28mL of ethylene glycol solution at room temperature. After the resulting mixture is ultrasonically dispersed for 45min, add 110mg of cobalt nitrate, 1200mg of anhydrous sodium acetate and 0.2mL of polyethylene glycol 200, and stir for 1.5h to form a reaction solution . The reaction solution was added into the reaction kettle, the temperature was raised to 200°C, and the reaction was carried out for 12 hours. After the reaction was completed, the product was collected by centrifugation, washed 6 times with deionized water and 3 times with absolute ethanol, and then dried at 60° C. for 18 hours to obtain a cobalt / graphene composite material. figure 1 The X-ray diffraction pattern of the material obtained in this example shows that the nanoparticles in the composite material are cobalt, and the graphite oxide is reduced to graphene. figure 2 It is a scanning electron microscope photo of the material obtained in this embodime...

Embodiment 2

[0027] Weigh 55 mg of graphite oxide and disperse in 110 mL of ethylene glycol solution at room temperature. After the resulting mixture is ultrasonically dispersed for 30 min, add 55 mg of cobalt nitrate, 550 mg of anhydrous sodium acetate and 1 mL of polyethylene glycol 1000, and stir for 1 h to form a reaction solution. The reaction solution was added to the reaction kettle, the temperature was raised to 180°C, and the reaction was carried out for 16 hours. After the reaction was completed, the product was collected by centrifugation, washed 8 times with deionized water and 5 times with absolute ethanol, and then dried at 40° C. for 24 h to obtain a cobalt / graphene composite material. X-ray diffraction analysis shows that the nanoparticles in the synthesized material of this example are cobalt. The hysteresis loop test shows that the obtained material has good magnetic properties. The resistivity test results show that the composite material has good electrical conductivit...

Embodiment 3

[0029] Weigh 55 mg of graphite oxide and disperse in 55 mL of ethylene glycol solution at room temperature. After ultrasonic dispersion of the resulting mixture for 60 min, add 165 mg of cobalt nitrate, 1980 mg of anhydrous sodium acetate and 0.1 mL of polyethylene glycol 400, and stir for 2 h to form a reaction solution. The reaction solution was added into the reaction kettle, the temperature was raised to 210°C, and the reaction was carried out for 8 hours. After the reaction was completed, the product was collected by centrifugation, washed with deionized water and absolute ethanol, and then dried at 80° C. for 12 hours to obtain a cobalt / graphene composite material. X-ray diffraction analysis shows that the nanoparticles in the synthesized material of this example are cobalt. The hysteresis loop test shows that the obtained material has good magnetic properties. The resistivity test results show that the composite material has good electrical conductivity.

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Abstract

The invention relates to a method for preparing a cobalt / graphene composite material by an alcohol thermal method. The method comprises the following steps of: (1) dispersing graphite oxide into glycol solution at room temperature to obtain mixed solution with concentration of 0.5 to 2 mg / mL, ultrasonically dispersing the mixed solution for 30 to 60 minutes, adding cobalt salt, anhydrous sodium acetate and polyethylene glycol, and stirring for 1 to 2 hours to obtain reaction solution; and (2) adding the reaction solution into a reaction kettle, heating the reaction kettle to 180 to 210 DEG C,reacting for 8 to 16 hours, cooling the obtained product to room temperature, centrifugally collecting the product, washing the product with deionized water and absolute ethanol, and drying to obtainthe cobalt / graphene composite material. The method is simple in process and suitable for industrialized production. The prepared cobalt / graphene composite material has a pure cobalt crystalline phase, high complex property with graphene, high dispersibility on the surface of the graphene and in the layer, low resistivity, high magnetization intensity and a good application prospect.

Description

technical field [0001] The invention belongs to the field of cobalt / graphene composite materials, in particular to a method for preparing cobalt / graphene composite materials by an alcohol-thermal method. Background technique [0002] Graphene is a carbon atom by sp 2 Carbon lattices are tightly arranged to form layered materials similar to honeycomb structures, which have attracted extensive attention from the scientific community in recent years. The electron movement speed of graphene reaches 1 / 300 of the speed of light, that is to say, it far exceeds the movement speed of electrons in general conductors. Many studies expect to achieve the purpose of improving the electrical properties of materials by combining with graphene. In addition, it also has many excellent properties: good thermal conductivity, mechanical properties, chemical stability, large surface area-to-volume ratio, which makes it useful in nanoelectronics, sensors, nanocomposites, batteries, supercapacitor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y30/00
Inventor 李耀刚张飞王宏志张青红
Owner DONGHUA UNIV
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