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Cobalt/graphene composite nano wave-absorbing material and preparation method thereof

A composite technology of nano-absorbing materials and graphene, which is applied in the field of absorbing materials

Inactive Publication Date: 2014-12-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, regardless of its absorption strength, frequency band width or density, there is room for improvement

Method used

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  • Cobalt/graphene composite nano wave-absorbing material and preparation method thereof
  • Cobalt/graphene composite nano wave-absorbing material and preparation method thereof
  • Cobalt/graphene composite nano wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1: Preparation of Graphene Oxide

[0037] Take 3g of graphite and put it into a three-necked flask, add 360ml of 98% concentrated sulfuric acid and 40ml of 85% concentrated phosphoric acid, and stir at room temperature for 24 hours. Transfer the three-neck flask to an ice-water bath, and after the temperature drops to 4°C, slowly add 18g of potassium permanganate to control the temperature below 20°C. After stirring evenly, the temperature was raised to 50° C. for 12 hours to stop the reaction. After the product is cooled, pour it into 400ml of ice, and add 3ml of hydrogen peroxide with a mass fraction of 30%. After the product is cooled, it is centrifuged and washed with 10% hydrochloric acid and water respectively to obtain graphite oxide. Ultrasonic stripping of graphite oxide for 2 hours, high-speed centrifugation, taking the upper layer solution, drying and grinding to obtain graphene oxide powder.

[0038] Step 2: Reduction of Graphene Oxide

[0039] Take...

Embodiment 2

[0049] Step 1: Preparation of Graphene Oxide

[0050] Take 3g of graphite and put it into a three-necked flask, add 360ml of 98% concentrated sulfuric acid and 40ml of 85% concentrated phosphoric acid, and stir at room temperature for 24 hours. Transfer the three-neck flask to an ice-water bath, and after the temperature drops to 4°C, slowly add 18g of potassium permanganate to control the temperature below 20°C. After stirring evenly, the temperature was raised to 50° C. for 12 hours to stop the reaction. After the product is cooled, pour it into 400ml of ice, and add 3ml of hydrogen peroxide with a mass fraction of 30%. After the product is cooled, it is centrifuged and washed with hydrochloric acid and water with a volume ratio of 10%, respectively, and finally graphite oxide is obtained. Ultrasonic stripping of graphite oxide for 2 hours, high-speed centrifugation, taking the upper layer solution, drying and grinding to obtain graphene oxide powder.

[0051] Step 2: Red...

Embodiment 3

[0060] Step 1: Preparation of Graphene Oxide

[0061] Take 3g of graphite and put it into a three-necked flask, add 360ml of concentrated sulfuric acid with a concentration of 98%, and 40ml of concentrated phosphoric acid with a concentration of 85%, and stir at room temperature for 24 hours. The three-neck flask was transferred to an ice-water bath, and after the temperature dropped to 4°C, 18 g of potassium permanganate was slowly added to control the temperature to 20°C. After stirring evenly, the temperature was raised to 50° C. for 12 hours to stop the reaction. After the product is cooled, pour it into 400ml of ice, and add 3ml of hydrogen peroxide with a mass fraction of 30%. After the product is cooled, it is centrifuged and washed with 10% hydrochloric acid and water respectively to obtain graphite oxide. Ultrasonic stripping of graphite oxide for 2 hours, high-speed centrifugation, taking the upper layer solution, drying and grinding to obtain graphene oxide powder...

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Abstract

The invention discloses a cobalt / graphene composite nano wave-absorbing material and a preparation method thereof, and belongs to the field of wave-absorbing materials. The cobalt / graphene composite nano wave-absorbing material is composed of cobalt and graphene, and the cobalt is loaded on the surface of the graphene. According to the cobalt / graphene composite nano wave-absorbing material and the preparation method thereof, a chemical oxidation-reduction method is used for preparing the graphene, and then nano cobalt particles are loaded on the surface of the graphene through a chemical plating method. Plating is conducted by one hour under the condition of 70 DEG C, the prepared composite material has wide wave-absorbing frequency bands, when the matched thickness is 2 mm, the frequency band with the reflectivity smaller than -10 dB is 12.5-17.5 GHz, and the maximum absorption is -12.5 dB when the frequency band is about 15.5 GHz.

Description

technical field [0001] The invention relates to a cobalt / graphene composite nano wave-absorbing material and a preparation method thereof, belonging to the technical field of wave-absorbing materials. Background technique [0002] Absorbing materials are a class of materials that can absorb electromagnetic wave energy projected onto its surface and convert it into heat energy through material loss. The original design of absorbing materials is mainly used in the research of stealth aircraft in the military. With the progress of society and the wide application of technologies such as wireless electromagnetic waves, wave-absorbing materials have also begun to be widely used in daily life such as construction and home appliances. [0003] Graphene is a newly discovered class of carbon materials with a two-dimensional structure. Due to its unique two-dimensional structure, graphene has many exotic physical properties, such as high specific surface area, low density, strong me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24C01B31/04C09K3/00B82Y30/00
Inventor 朱红林帅于景华王芳辉
Owner BEIJING UNIV OF CHEM TECH
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