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Method for preparing nitrogen doped reduced graphene oxide aerogel wave-absorbing material

A graphene aerogel, graphene hydrogel technology, applied in the direction of graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of high filling percentage of wave absorbers and narrow absorption bandwidth, and achieve wave absorption performance Excellent, easy to operate, effective absorption and attenuation

Inactive Publication Date: 2018-12-07
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, when RGO is used as an electromagnetic wave absorbing material, the research mainly focuses on the construction of low-dimensional (zero-dimensional, two-dimensional) composite materials. Generally, there are disadvantages such as high filling percentage and narrow absorption bandwidth when absorbing agents are used as fillers.

Method used

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  • Method for preparing nitrogen doped reduced graphene oxide aerogel wave-absorbing material
  • Method for preparing nitrogen doped reduced graphene oxide aerogel wave-absorbing material
  • Method for preparing nitrogen doped reduced graphene oxide aerogel wave-absorbing material

Examples

Experimental program
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Embodiment 1

[0031] 1. Take a 100mL beaker, add 30mL of deionized water, then add 60mg of graphite oxide, sonicate for 1h, and stir vigorously for 30min to obtain a GO aqueous dispersion with a concentration of 2mg / mL.

[0032] 2. During the stirring process, slowly add EDA with a volume of 180 μL dropwise, and continue stirring for 30 minutes.

[0033] 3. Pour the reaction solution in the beaker into a 50mL reaction kettle, and conduct a hydrothermal reaction at 120°C for 12h.

[0034] 4. After the reaction, the nitrogen-doped reduced graphene oxide hydrogel was obtained, and the hydrogel was slowly added to 100 mL of 10% ethanol aqueous solution by volume, dialyzed for 24 hours, and the ethanol aqueous solution was changed every 6 hours.

[0035] 5. Pre-freeze the dialyzed hydrogel in the refrigerator for 12 hours, and then freeze-dry for 36 hours to obtain nitrogen-doped reduced graphene oxide aerogel, denoted as S1.

[0036] The XRD spectrum pattern of embodiment 1 product S1 is shown...

Embodiment 2

[0038] 1. Take a 100mL beaker, add 30mL of deionized water, then add 60mg of graphite oxide, sonicate for 1h, and stir vigorously for 30min to obtain a GO aqueous dispersion with a concentration of 2mg / mL.

[0039] 2. During the stirring process, slowly add EDA with a volume of 240 μL dropwise, and continue stirring for 30 minutes.

[0040] 3. Pour the reaction solution in the beaker into a 50mL reaction kettle, and conduct a hydrothermal reaction at 120°C for 12h.

[0041] 4. After the reaction, the nitrogen-doped reduced graphene oxide hydrogel was obtained, and the hydrogel was slowly added to 100 mL of 10% ethanol aqueous solution by volume, dialyzed for 24 hours, and the ethanol aqueous solution was changed every 6 hours.

[0042] 5. Pre-freezing the dialyzed hydrogel in the refrigerator for 12 hours, and then freeze-drying for 36 hours to obtain nitrogen-doped reduced graphene oxide aerogel, denoted as S2.

[0043] The XRD spectrum pattern of embodiment 2 product S2 see...

Embodiment 3

[0045] 1. Take a 100mL beaker, add 30mL of deionized water, then add 60mg of graphite oxide, sonicate for 1h, and stir vigorously for 30min to obtain a GO aqueous dispersion with a concentration of 2mg / mL.

[0046] 2. During the stirring process, slowly add EDA with a volume of 300 μL dropwise, and continue stirring for 30 minutes.

[0047] 3. Pour the reaction solution in the beaker into a 50mL reaction kettle, and conduct a hydrothermal reaction at 120°C for 12h.

[0048] 4. After the reaction, the nitrogen-doped reduced graphene oxide hydrogel was obtained, and the hydrogel was slowly added to 100 mL of 10% ethanol aqueous solution by volume, dialyzed for 24 hours, and the ethanol aqueous solution was changed every 6 hours.

[0049] 5. Pre-freeze the dialyzed hydrogel in the refrigerator for 12 hours, and then freeze-dry for 36 hours to obtain nitrogen-doped reduced graphene oxide airgel, which is designated as S3.

[0050] The XRD spectrum pattern of embodiment 3 product ...

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Abstract

The invention discloses a nitrogen doped reduced graphene oxide aerogel (NGA) wave-absorbing material and a preparation method thereof. According to the preparation method, nitrogen doped reduced graphene oxide hydrogel is formed through in-situ self-assembly of a one-step hydrothermal method by taking graphene oxide (GO) aqueous dispersion as a template and ethylenediamine (EDA) as a nitrogen doping agent and reducing agent, and the nitrogen doped NGA wave-absorbing material through dialysis and lyophilizing. The preparation method is environment-friendly, and has the advantages of no toxic or side product generation, simple preparation process, mild reaction condition and low cost. The aerogel wave-absorbing material has strong electromagnetic wave absorbing performance, wide absorptionfrequency band, low density and low packing ration, electromagnetic waves at different wavebands can be effectively absorbed by adjusting the nitrogen doping amount and thickness of a wave-absorbing coating, so that the NGA wave-absorbing material has an important application value in the field of electromagnetic absorption and electromagnetic shielding.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic stealth materials, and in particular relates to a preparation method of a nitrogen-doped reduced graphene oxide airgel wave-absorbing material. Background technique [0002] In recent years, the problem of electromagnetic pollution has become increasingly serious. Electromagnetic radiation emitted by electronic devices that can be seen everywhere in life will directly harm the nervous system and immune system of the human body through thermal effects. In addition, electromagnetic stealth technology in the military field is also constantly developing and progressing, and electromagnetic wave absorbing materials have gradually become a research hotspot in the field of functional materials. [0003] Graphene is a honeycomb two-dimensional crystal composed of carbon six-membered rings, that is, single-layer graphite. It has excellent properties such as high specific surface area, ultra-high c...

Claims

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Application Information

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IPC IPC(8): C01B32/184H05K9/00
CPCC01B2204/20C01B32/184H05K9/0081
Inventor 疏瑞文张耕源张佳宾吴越李为杰
Owner ANHUI UNIV OF SCI & TECH
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