A kind of porous carbon@carbon nanotube absorbing material and its preparation method

A carbon nanotube and wave-absorbing material technology, applied in the field of material science, can solve the problems of large filling amount and unfavorable application

Active Publication Date: 2021-09-14
宁波维创柔性电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the existing carbonaceous materials with porous structure have strong electromagnetic wave absorption characteristics, the filling amount of these electromagnetic wave absorbers in the matrix is ​​relatively large, which is not conducive to practical application.

Method used

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  • A kind of porous carbon@carbon nanotube absorbing material and its preparation method
  • A kind of porous carbon@carbon nanotube absorbing material and its preparation method
  • A kind of porous carbon@carbon nanotube absorbing material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A method for preparing porous carbon@carbon nanotube wave-absorbing material using sodium chloride as a template, comprising the following steps:

[0047] (1) Firstly, 0.9 g of thiourea was dispersed in 12 mL of saturated sodium chloride solution to obtain mixed solution A.

[0048] (2) Then add 0.9g of sucrose into the mixed solution A and disperse evenly to obtain the mixed solution B.

[0049] (3) 0.03g cobalt chloride hexahydrate is added in the mixed solution B to obtain the mixed solution C;

[0050] (4) The mixed solution C was sonicated at 600W for 0.8h, then 100mL of liquid nitrogen was added, and freeze-dried for 24h to obtain solid D;

[0051] (5) The solid D was heated up to 590° C. at 1° C. / min under an argon atmosphere, and then kept for 1.5 h to obtain solid E.

[0052] (6) Grinding the solid E, adding deionized water, ultrasonication at 600W for 4 hours, filtration, and vacuum drying at 75°C for 11 hours to obtain solid F.

[0053] (7) After the solid F...

Embodiment 2

[0055] A method for preparing porous carbon@carbon nanotube wave-absorbing material using sodium chloride as a template, comprising the following steps:

[0056] (1) First, 1 g of thiourea was dispersed in 12 mL of saturated sodium chloride solution to obtain mixed solution A.

[0057] (2) Then add 1 g of sucrose into the mixed solution A and disperse evenly to obtain the mixed solution B.

[0058] (3) 0.03g cobalt chloride hexahydrate is added in the mixed solution B to obtain the mixed solution C;

[0059] (4) The mixed solution C was sonicated at 600W for 1 hour, then 150 mL of liquid nitrogen was added, and freeze-dried for 24 hours to obtain solid D;

[0060] (5) The solid D was heated up to 600° C. at 2° C. / min under an argon atmosphere, and then kept for 2 hours to obtain solid E.

[0061] (6) After grinding the solid E, add deionized water, sonicate at 600W for 5h, filter, and vacuum dry at 80°C for 12h to obtain solid F.

[0062] (7) After the solid F was heated up...

Embodiment 3

[0064] A method for preparing porous carbon@carbon nanotube wave-absorbing material using sodium chloride as a template, comprising the following steps:

[0065] (1) Firstly, 1.1 g of thiourea was dispersed in 12 mL of saturated sodium chloride solution to obtain mixed solution A.

[0066] (2) Then add 1.1 g of sucrose into the mixed solution A and disperse evenly to obtain the mixed solution B.

[0067] (3) 0.03g cobalt chloride hexahydrate is added in the mixed solution B to obtain the mixed solution C;

[0068] (4) The mixed solution C was sonicated at 600W for 1.2h, then 200mL of liquid nitrogen was added, and freeze-dried for 24h to obtain solid D;

[0069] (5) The solid D was heated up to 610° C. at 3° C. / min under an argon atmosphere, and then kept for 2.5 hours to obtain solid E.

[0070] (6) Grinding the solid E, adding deionized water, ultrasonication at 600W for 6 hours, filtration, and vacuum drying at 85°C for 13 hours to obtain solid F.

[0071] (7) The solid ...

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Abstract

The invention provides a porous carbon@carbon nanotube absorbing material and a preparation method thereof, comprising the following steps: step 1, adding thiourea, sucrose and cobalt chloride hexahydrate into a saturated sodium chloride solution, and dispersing evenly to obtain Mixed solution C; Step 2, ultrasonically freeze-dry the mixed solution C to obtain solid D; Step 3, pyrolyze solid D under a protective atmosphere at 590-610°C to obtain solid E; Step 4, grind solid E Then add water, sonicate, filter, collect the solid, and dry it in vacuum to obtain solid F; Step 5, pyrolyze the solid F under a protective atmosphere at 890-910°C to obtain a porous carbon@carbon nanotube absorbing material. The porous carbon@carbon nanotube wave-absorbing material prepared by the invention has obvious porous structure, low filling amount and good wave-absorbing performance.

Description

technical field [0001] The invention belongs to the field of material science, and relates to a porous carbon@carbon nanotube wave-absorbing material and a preparation method thereof. Background technique [0002] With the development of electronic information technology and the popularization of electronic products, electromagnetic waves widely exist in people's daily life while meeting people's daily needs, and the problem of electromagnetic pollution is becoming more and more serious. In addition, in the military field, the rapid development of modern radio technology and radar detection systems has greatly promoted the ability to search and track targets in war, and the threats to traditional combat weapons are becoming more and more serious. It is an effective method to attenuate these electromagnetic wave energies with absorbing materials. An ideal absorbing material should have the advantages of thin thickness, wide absorption frequency band, light weight, strong abs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
Inventor 王雷百晓宇杜臻文博林营杨海波
Owner 宁波维创柔性电子技术有限公司
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