Terahertz wave-absorbing material with gradient pore size structure and preparation method thereof

A wave absorbing material and terahertz technology, applied in the field of terahertz wave absorption, can solve the problems of reducing the attenuation effect of terahertz waves, obstructing the incidence of terahertz waves, failing to achieve material properties, etc., and achieve strong broadband terahertz wave absorption characteristics, Simple preparation method and low cost of raw materials

CN111730924AActive Publication Date: 2020-10-02UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-10-02

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Abstract

The invention discloses a terahertz wave-absorbing material with a gradient pore size structure, and belongs to the technical field of terahertz wave absorption. The wave-absorbing material comprisesthree layers of three-dimensional graphene / PDMS composite materials, wherein the pore size range of the three-dimensional graphene on the uppermost layer is 100-120 [mu]m, the pore size range of the three-dimensional graphene in the middle is 50-70 [mu]m, and the pore size range of the three-dimensional graphene on the lowermost layer is 20-40 [mu]m. The terahertz wave-absorbing material disclosedby the invention has an extremely strong broadband terahertz wave absorption characteristic, and the average absorption rate in an ultra-wideband frequency spectrum range of 0.2-1.2 THz is as high as93% or above; the terahertz wave-absorbing material has ultrathin thickness, and the thickness of each layer is controlled within 1mm, so that the total thickness of the terahertz wave-absorbing material is within 3 mm, which is far superior to that of existing terahertz wave-absorbing foam materials; the terahertz wave-absorbing material has extremely good flexible characteristics such as bendability, stretchability and mechanical elasticity; raw materials are cheap, the preparation method is simple, and large-area preparation can be realized.
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Description

technical field

[0001] The invention belongs to the technical field of terahertz absorbing, and in particular relates to a three-dimensional graphene / PDMS terahertz absorbing material with a gradient aperture structure and a preparation method thereof. Background technique

[0002] Terahertz (THz, 1THz=10 12 Hz) waves refer to electromagnetic waves with a frequency between 0.1THz-10THz and a wavelength between 0.03mm-0.3mm. Terahertz waves lie between infrared and millimeter waves in frequency. In the electromagnetic spectrum, the research on infrared technology and microwave technology has been very mature, but the research on terahertz wave is still in progress and has not been fully developed and applied. In recent years, with the rapid development of terahertz radiation sources and terahertz detectors, the progress of terahertz technology has gradually accelerated, showing great scientific value in the fields of physics, biology, astronomy, national defense, and mobile...

Examples

Embodiment

[0023] Step 1, preparing three-dimensional graphene with a nickel substrate and an average pore diameter of 110 μm. A template-guided chemical deposition method is used: nickel foam is used as the deposition substrate, methane is used as the growth carbon source, and a 100mm caliber quartz tube furnace is used as the growth equipment; nickel foam with an average pore size of 110 μm is placed in the tube furnace, and 10 sccm methane is introduced As the growth gas, the growth time is 30min; after completion, the methane gas is turned off, and the temperature is naturally lowered to room temperature.

[0024] Step 2, preparing three-dimensional graphene. Get concentration is 2mol / L hydrogen chloride (HCL) solution 10ml, concentration is 2mol / L iron trichloride (FeCl 3 ) solution 10ml, hydrogen chloride solution and ferric chloride solution are mixed to obtain a mixed solution; the three-dimensional graphene with a nickel substrate obtained in step 1 is put into the mixed soluti...