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Preparation method of porous film material for shielding terahertz waves

A porous film, porous foam technology, applied in chemical instruments and methods, inorganic chemistry, coatings, etc., can solve the problems of rough surface of porous film materials, poor toughness, inability to bend, poor electrical conductivity, etc., saving process, The effect of smooth surface and improved yield

Active Publication Date: 2021-06-11
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Usually, the pore structure in graphene membrane materials can be obtained by methods such as hydrazine hydrate steam reduction, hard template method, bubble method and foaming agent method, but the obtained porous membrane materials often have rough surfaces, uneven pores, and poor conductivity. Good, poor toughness can not be bent

Method used

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  • Preparation method of porous film material for shielding terahertz waves
  • Preparation method of porous film material for shielding terahertz waves
  • Preparation method of porous film material for shielding terahertz waves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] S1: Transfer 4ml of graphene oxide aqueous solution with a concentration of 10mg / ml to a standard glass slide placed horizontally. After natural drying, the thickness of the film is about 20 μm. Cut the slide into two identical pieces.

[0028] S2: Place the graphene oxide film in S1 in sequence with gaskets, porous nickel mesh, and glass slides and fix them with rubber bands. The thickness of the porous nickel mesh is 0.5-1mm, the pore diameter is 50-110ppi, and the porosity is greater than or equal to 95. %, the through-hole rate is greater than or equal to 95%, indicating smoothness.

[0029] S3, putting the fixed graphene oxide film in S2 into a sealable container with hydrazine hydrate, so that it is above the hydrazine hydrate and not in contact, then put the sealed container into a water bath and heat for 3 hours to obtain Graphene porous film.

[0030] S4. Put the graphene porous film obtained in S3 into a tube furnace for heat treatment, the treatment atmosphe...

Embodiment 2

[0033] S1. Transfer 4ml of graphene oxide aqueous solution with a concentration of 10mg / ml to a standard glass slide placed horizontally. After natural drying, the thickness of the film is about 20 μm. Cut the glass slide into two identical pieces.

[0034] S2: Place the graphene oxide film in S1 in sequence with gaskets, porous nickel mesh, and glass slides and fix them with rubber bands. The thickness of the porous nickel mesh is 0.5-1mm, the pore diameter is 50-110ppi, and the porosity is greater than or equal to 95. %, the through-hole rate is greater than or equal to 95%, indicating smoothness.

[0035] S3, putting the fixed graphene oxide film in S2 into a sealable container with hydrazine hydrate, so that it is above the hydrazine hydrate and not in contact, then put the sealed container into a water bath and heat for 3 hours to obtain Graphene porous film.

[0036] S4. Put the graphene porous film obtained in S3 into a tube furnace for heat treatment, the treatment at...

Embodiment 3

[0039] S1. Transfer 4ml of graphene oxide aqueous solution with a concentration of 10mg / ml to a standard glass slide placed horizontally. After natural drying, the thickness of the film is about 20 μm. Cut the glass slide into two identical pieces.

[0040] S2: Place the graphene oxide film in S1 in sequence with gaskets, porous nickel mesh, and glass slides and fix them with rubber bands. The thickness of the porous nickel mesh is 0.5-1mm, the pore diameter is 50-110ppi, and the porosity is greater than or equal to 95. %, the through-hole rate is greater than or equal to 95%, indicating smoothness.

[0041] S3, putting the fixed graphene oxide film in S2 into a sealable container with hydrazine hydrate, so that it is above the hydrazine hydrate and not in contact, then put the sealed container into a water bath and heat for 3 hours to obtain Graphene porous film.

[0042] S4. Put the graphene porous film obtained in S3 into a tube furnace for heat treatment, the treatment at...

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Abstract

The invention discloses a preparation method of a porous film material capable of shielding terahertz waves. A graphene oxide aqueous solution is used as a raw material, and a graphene oxide film is formed through transfer, infiltration and drying; then cutting, and fixed packaging treatment are performed; reduction foaming treatment is performed on the graphene film in a closed container by using hydrazine hydrate steam; and finally, heat treatment is carried ou on the graphene porous film obtained by chemical reduction treatment. According to the method, the graphene porous film material with the characteristics of smooth surface, good conductivity, light weight, thin thickness, hydrophobicity and the like can be prepared. In addition to reflection of a conductive surface to terahertz waves, the graphene porous film material can also form multiple internal reflections on the terahertz waves entering the material in an incident manner to increase loss of electromagnetic wave energy due to uniform distribution and large number of internal pores, and therefore, the graphene porous film material has the potential of becoming a terahertz wave shielding material with the characteristics of being light, thin, wide and strong.

Description

technical field [0001] The invention relates to nano-carbon materials and two-dimensional carbon material assembly structure film materials, in particular to a preparation method of a graphene porous film material. Background technique [0002] Carbon materials are an indispensable part of the material field, and the star carbon material that has caused widespread research boom in recent years is graphene. Graphene is a honeycomb-like two-dimensional planar structure material formed by the close combination of single-layer carbon atoms, which has excellent mechanical, thermal, optical, electrical properties and electromagnetic shielding properties. [0003] In addition, on the one hand, the preparation methods of graphene are various, and different synthesis methods endow graphene with many adjustable properties, including its electrical conductivity, carrier mobility, lateral size, light transmittance, dielectric constant, etc.; on the other hand, Graphene components can e...

Claims

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Application Information

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IPC IPC(8): C03C17/00C01B32/194C09K3/00
CPCC03C17/002C01B32/194C09K3/00C03C2217/28C01B2204/22
Inventor 彭文屹马强邓晓华沈云刘宗佩杨永超于思琪孙祖祥高安澜余钦洋余飞翔
Owner NANCHANG UNIV
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