Chip-borne multi-ball embedded structure terahertz wave-absorbing material and preparation method thereof
By introducing a multi-sphere embedded structure onto a sheet in a terahertz absorbing material and using PEDOT and PS microspheres to form a continuous conductive network, a flexible terahertz absorbing film was prepared, solving the absorption performance and stability problems of existing materials and achieving a wide-bandwidth and high-efficiency absorbing effect.
Patent Information
- Application Number
- CN202511150711.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-18
- Publication Date
- 2025-11-28
AI Technical Summary
Existing terahertz absorbing materials suffer from problems such as complex manufacturing processes, limited absorption performance, poor structural stability, and insufficient thinness, which fail to meet the needs of practical applications.
A flexible terahertz absorbing film was prepared by using a multi-sphere embedded structure on a sheet, with poly(3,4-ethylenedioxythiophene) (PEDOT) as the matrix and polystyrene (PS) microspheres randomly embedded to form a continuous conductive network.
It achieves wide-bandwidth and high-efficiency terahertz absorption performance, solves the problems of excessive reflection and poor absorption performance of conductive polymer films, and has good material structure stability.
Smart Images
Figure CN121022041A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of terahertz wave absorption, and specifically provides a sheet-loaded multi-ball embedded structure terahertz wave absorbing material and a preparation method thereof. BACKGROUND
[0002] Terahertz waves have the characteristics of strong penetration, low photon energy, wide frequency band and high imaging resolution, and show broad application prospects in the fields of 6G communication, security inspection, atmospheric remote sensing and radio astronomy. With the continuous enrichment and improvement of application scenarios, the demand for high-performance terahertz wave absorbing materials is also increasing; however, the existing terahertz wave absorbing materials often have problems such as complex process, limited absorption performance, poor structural stability, insufficient lightness and thinness, etc., and cannot meet the actual application requirements. Therefore, developing terahertz wave absorbing materials with wide frequency band, high absorption, lightness, thinness and structural stability has become an important research direction in the technical field of terahertz wave absorption.
[0003] The wave-absorbing film using conductive polymers as wave-absorbing agents has poor absorption performance due to large reflection. In contrast, composite materials with core-shell structure design are a kind of good electromagnetic wave-absorbing materials with functionality. The main component of the composite materials is conductive polymer, which has the characteristics of corrosion resistance, low density, simple preparation and low cost. Through the composition and structure design of the core-shell structure, the physical properties of the composite materials can be effectively optimized to expand the application field. However, the shell layer of the core-shell structure is prone to brittle fracture, resulting in discontinuity of the conductive network, and the surface of the shell layer only reflects once. Therefore, developing a new type of structure wave-absorbing agent has become the research direction of the present application. Through deep coupling of micro geometric morphology and electromagnetic characteristics, wideband and efficient terahertz absorption performance is achieved in a limited space. SUMMARY
[0004] The present application aims to provide a sheet-loaded multi-ball embedded structure terahertz wave absorbing material and a preparation method thereof, to solve the problems of large thickness, high reflection intensity and easy secondary electromagnetic pollution of existing conductive polymer electromagnetic wave-absorbing materials. The present application uses large-area sheet-shaped poly(3,4-ethylenedioxythiophene) (PEDOT) as the matrix, introduces micron-sized polystyrene (PS) microspheres to construct a spatial isolation template, forms a sheet-loaded multi-ball embedded structure wave-absorbing agent that can effectively regulate the continuous conductive network, and forms a flexible terahertz wave-absorbing film with waterborne polyurethane.
[0005] To achieve the above-mentioned purposes, the technical solution adopted by the present application is as follows:
[0006] A sheet-loaded multi-ball embedded structure terahertz wave absorbing material, characterized in that the sheet-loaded multi-ball embedded structure terahertz wave absorbing material uses poly(3,4-ethylenedioxythiophene) (PEDOT) as the matrix, and the matrix randomly embeds polystyrene (PS) microspheres, and the mass ratio of the matrix to the polystyrene microspheres is (1-5):1.
[0007] Further, the diameter of the polystyrene microspheres is 3-10 microns.
[0008] Further, the preparation method of the sheet-loaded multi-ball embedded structure terahertz wave absorbing material has the characteristics that it comprises the following steps:
[0009] Step 1. The PS microsphere dispersion liquid is added into the PEDOT solution and mixed uniformly.
[0010] Step 2. The solution is frozen at a temperature of-18 to-20 DEG C for 8-10 hours, and freeze-dried for 24-30 hours to obtain the sheet-loaded multi-ball embedded structure terahertz wave absorbing material.
[0011] Further, in step 1, the mixing process is: first ultrasonic treatment at a power of 120 W and a frequency of 80 KHz for 15-20 minutes, and then stirring at a speed of 600-700 rpm for 10-30 minutes.
[0012] From the working principle:
[0013] The poly 3,4-ethylenedioxythiophene (PEDOT) belongs to a large specific surface area sheet material, and has good dielectric loss capacity for terahertz waves. Therefore, the present application takes PEDOT as a matrix, proposes the design of a sheet-loaded multi-ball embedded structure, provides a mechanical fulcrum through the insulating PS microspheres, makes the PEDOT sheet layer suspended and curved, adjusts the distance between the sheet layers by adjusting the diameter of the PS microspheres, and finally forms a random continuous deformation sheet layer wave absorber. The incident electromagnetic wave can be reflected and scattered multiple times in the sheet material with non-uniform curvature, increases the propagation path of the incident wave and the multiple loss capacity, and effectively absorbs the electromagnetic wave.
[0014] In summary, the present application has the following advantages:
[0015] The present application obtains a sheet-loaded multi-ball embedded structure terahertz wave absorber by direct polymerization, greatly increases the propagation path of the terahertz wave by using a random continuous deformation sheet structure, and gradually effectively loses the incident electromagnetic wave due to multiple reflections, thereby obtaining a terahertz wave absorber with excellent performance. Moreover, the sheet-loaded multi-ball embedded structure wave absorber can be filled into water-based polyurethane to obtain a terahertz wave absorbing slurry, so as to be integrated with a device, or a flexible terahertz wave absorbing film is obtained by drying. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is a physical picture of the sheet-loaded multi-ball embedded structure terahertz wave absorbing material in the embodiments of the present application.
[0017] Figure 2SEM and EDS images of the sheet-loaded multi-ball embedded structure terahertz wave absorbing material in the embodiment of the present application.
[0018] Figure 3 Physical image of the terahertz wave absorbing film synthesized by the sheet-loaded multi-ball embedded structure terahertz wave absorbing material in the embodiment of the present application.
[0019] Figure 4 Terahertz wave absorbing performance diagram of the terahertz wave absorbing film synthesized by the sheet-loaded multi-ball embedded structure terahertz wave absorbing material in the embodiment of the present application. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical scheme and beneficial effects of the present application more clear and explicit, the present application is further described in detail below with reference to the drawings and embodiments.
[0021] The embodiment provides a sheet-loaded multi-ball embedded structure terahertz wave absorbing material, which is prepared by the following steps:
[0022] Step 1. 0.4 ml of PS microsphere dispersion liquid (the dispersion liquid contains PS with a concentration of 2.5 wt%, and the calculated PS ball content is 0.01 g) and 3.1 ml of PEDOT solution (the solution contains PEDOT with a concentration of 1.3 wt%, and 3.1 ml of solution is taken to obtain PEDOT with a mass of about 0.04 g) are taken respectively by using a rubber bulb dropper and placed in a clean beaker; after mixing the two solutions, ultrasonic treatment is first carried out at a power of 120 W and a frequency of 80 KHz for 15 min to 20 min, and then stirring is carried out at a rotation speed of 600 rpm to 700 rpm for 10 min to 30 min until uniform mixing is achieved;
[0023] Step 2. The obtained mixed liquid is placed in a freezing room at-18℃ for 10 h for molding, and then it is placed in a vacuum freeze-drying box for freeze-drying for 24 h to obtain a loose and porous dark blue flocculent block material, which is the wave absorbing agent;
[0024] Step 3. 0.06 g of the wave absorbing agent obtained above is placed in a mortar, 1.5 g of water-based polyurethane is taken by using a rubber bulb dropper and dropped into the wave absorbing agent, and a grinding rod is used for grinding for 15 min to obtain a uniformly mixed wave absorbing slurry;
[0025] Step 4. The mixed wave absorbing slurry is dropped and coated on a substrate, dried at a constant temperature heating table at 80℃, and completely dried after cooling to obtain a flexible terahertz wave absorbing film with a thickness of 1 mm.
[0026] As shown in Figure 1 the physical image of the sheet-loaded multi-ball embedded structure wave absorbing agent obtained in the embodiment, as shown in Figure 2The SEM and EDS diagrams of the terahertz wave absorber with the sheet-loaded multi-ball embedded structure in the embodiment are shown, and it can be seen from the diagrams that the PS microspheres are randomly embedded in the continuous PEDOT sheet, and the isolation distance and curvature structure between the PEDOT sheet layers can be adjusted by adjusting the diameter of the PS balls.
[0027] As shown in Figure 3 The actual photos of the terahertz wave absorbing film synthesized by the sheet-loaded multi-ball embedded structure absorber in the embodiment are shown, the terahertz wave absorbing film is measured by a terahertz time-domain spectroscopy system in the frequency range of 0.2 THz to 1.2 THz, and the result obtained after calculation and processing is shown in Figure 4 It can be seen from the diagram that the reflection loss of the terahertz wave absorbing film synthesized by the sheet-loaded multi-ball embedded structure absorber is lower than -10 dB in the frequency range, and the effective absorption in a wide band is realized.
[0028] In summary, the sheet-loaded multi-ball embedded structure absorber is obtained by using the direct polymerization method, and the terahertz wave absorbing film is further obtained by compounding the water-based polyurethane, so that the problem of too strong reflection and poor absorption performance of the conductive polymer film can be effectively solved.
[0029] The above is only a specific embodiment of the present application, any feature disclosed in the specification can be replaced by other equivalent or similar purpose alternative features unless specifically described, and all features disclosed or all steps in the method or process can be combined in any way except for mutually exclusive features and / or steps.
Claims
1. A terahertz absorbing material with a multi-sphere embedded structure on a sheet, characterized in that, The multi-sphere embedded terahertz absorbing material is based on poly(3,4-ethylenedioxythiophene) (PEDOT) matrix, and polystyrene (PS) microspheres are randomly embedded in the matrix. The mass ratio of matrix to polystyrene microspheres is (1-5):
1.
2. The terahertz absorbing material with a multi-sphere embedded structure according to claim 1, characterized in that, The diameter of the polystyrene microspheres ranges from 3 μm to 10 μm.
3. The method for preparing the terahertz absorbing material with a multi-sphere embedded structure according to claim 1, characterized in that, Includes the following steps: Step 1. Add the PS microsphere dispersion to the PEDOT solution and mix thoroughly; Step 2. Freeze the solution at -18℃ to -20℃ for 8 to 10 hours to form a solid, and freeze-dry for 24 to 30 hours to obtain a terahertz absorbing material with a multi-sphere embedded structure.
4. The method for preparing the terahertz absorbing material with a multi-sphere embedded structure according to claim 3, characterized in that, In step 1, the mixing process is as follows: first, ultrasonic treatment is carried out at a power of 120W and a frequency of 80KHz for 15min to 20min, followed by stirring at a speed of 600rpm to 700rpm for 10min to 30min.