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CN-121974337-A - Hollow sea urchin-shaped Ni3Si2O5(OH)4Preparation of RGO composite material and electromagnetic wave absorption application thereof

CN121974337ACN 121974337 ACN121974337 ACN 121974337ACN-121974337-A

Abstract

The invention belongs to the technical field of multifunctional composite materials, and particularly relates to a preparation method and electromagnetic wave absorption application of a hollow sea urchin-shaped Ni 3 Si 2 O 5 (OH) 4 /RGO composite material. According to the invention, a hollow sea urchin-shaped Ni 3 Si 2 O 5 (OH) 4 /GO intermediate is prepared by a hydrothermal method, and then a high-temperature reduction treatment is carried out to obtain the hollow sea urchin-shaped Ni 3 Si 2 O 5 (OH) 4 /RGO composite material. Has the advantages of low cost, simple process, large-scale preparation, high corrosion resistance and the like. The unique hollow sea urchin-like structure of Ni 3 Si 2 O 5 (OH) 4 and the magnetoelectric synergistic effect between the two-dimensional Reduced Graphene Oxide (RGO) and Ni 3 Si 2 O 5 (OH) 4 endow the composite material with excellent broadband wave absorbing performance. Meanwhile, the composite material ensures outstanding corrosion resistance by virtue of stable chemical properties, and can be used as an excellent candidate material of corrosion-resistant wave-absorbing materials in the field of military stealth.

Inventors

  • HOU YANGLONG
  • JIA TIANMING
  • QI XIAOSI
  • TIAN ZHENZHEN
  • TANG JIHAI
  • YANG WUBIN
  • ZHANG LONG
  • YUAN CHAO

Assignees

  • 中山大学
  • 贵州铂韬电子科技有限公司
  • 贵州大学

Dates

Publication Date
20260505
Application Date
20260203

Claims (10)

  1. 1. The preparation method of the hollow sea urchin-shaped Ni 3 Si 2 O 5 (OH) 4 /RGO composite wave-absorbing material is characterized by comprising the following steps of: (1) Adding SiO 2 nano-particles and graphene oxide into deionized water, and stirring and mixing to form a dispersion liquid A; (2) Dissolving NiCl 2 ·H 2 O in deionized water, adding NH 4 Cl, stirring until the liquid is transparent, adding NH 3 ·H 2 O, and stirring to obtain a dispersion liquid B; (3) Mixing the dispersion liquid A and the dispersion liquid B, stirring, performing hydrothermal reaction, taking out a lower precipitate after the reaction is completed, and centrifuging, washing and drying for many times to obtain a product which is a hollow sea urchin-shaped Ni 3 Si 2 O 5 (OH) 4 /GO intermediate; (4) And (3) annealing the Ni 3 Si 2 O 5 (OH) 4 /GO intermediate in an argon-hydrogen mixed gas atmosphere, wherein the obtained product is the hollow sea urchin-shaped Ni 3 Si 2 O 5 (OH) 4 /RGO composite wave-absorbing material of the target product.
  2. 2. The preparation method of the hollow sea urchin-shaped Ni 3 Si 2 O 5 (OH) 4 /RGO composite wave-absorbing material according to claim 1, wherein in the step (1), the mass ratio of SiO 2 nano particles to graphene oxide is 3-5:1, and the stirring time is 5-10 min.
  3. 3. The method for preparing the hollow sea urchin-shaped Ni 3 Si 2 O 5 (OH) 4 /RGO composite wave-absorbing material according to claim 2, wherein the mass ratio of SiO 2 nano particles to graphene oxide is 3:1.
  4. 4. The method for preparing the hollow sea urchin-shaped Ni 3 Si 2 O 5 (OH) 4 /RGO composite wave-absorbing material according to claim 1, wherein in the step (2), the molar ratio of NiCl 2 ·H 2 O to NH 4 Cl is 2.7:5-20, the dosage ratio of NiCl 2 ·H 2 O to NH 3 ·H 2 O is 0.9-2.7 mmol/mL, and the stirring time is 5-10 min.
  5. 5. The method for preparing the hollow sea urchin-shaped Ni 3 Si 2 O 5 (OH) 4 /RGO composite wave-absorbing material according to claim 4, wherein the molar ratio of NiCl 2 ·H 2 O to NH 4 Cl is 2.7:10, and the dosage ratio of NiCl 2 ·H 2 O to NH 3 ·H 2 O is 1.35 mmol/mL.
  6. 6. The method for preparing the hollow sea urchin-shaped Ni 3 Si 2 O 5 (OH) 4 /RGO composite wave-absorbing material according to claim 1, wherein in the step (3), the stirring time is 5-10 min, the hydrothermal reaction temperature is 100-140 ℃, and the hydrothermal reaction time is 10-24 h.
  7. 7. The method for preparing a hollow sea urchin-like Ni 3 Si 2 O 5 (OH) 4 /RGO composite wave-absorbing material according to claim 6, wherein the temperature of the hydrothermal reaction is 120 ℃, and the time of the hydrothermal reaction is 20 h.
  8. 8. The method for preparing the hollow sea urchin-shaped Ni 3 Si 2 O 5 (OH) 4 /RGO composite wave-absorbing material according to claim 1, wherein in the step (4), the annealing temperature is 400-700 ℃, and the annealing time is 1-5 h.
  9. 9. The method for preparing the hollow sea urchin-shaped Ni 3 Si 2 O 5 (OH) 4 /RGO composite wave-absorbing material according to claim 8, wherein the annealing temperature is 450-500 ℃, and the annealing time is 2 h.
  10. 10. A hollow sea urchin-like Ni 3 Si 2 O 5 (OH) 4 /RGO composite wave-absorbing material prepared by the preparation method according to any one of claims 1 to 9.

Description

Preparation and electromagnetic wave absorption application of hollow sea urchin-shaped Ni 3Si2O5(OH)4/RGO composite material Technical Field The invention belongs to the technical field of multifunctional composite materials, and particularly relates to a preparation method and electromagnetic wave absorption application of a hollow sea urchin-shaped Ni 3Si2O5(OH)4/RGO composite material. Background With the rapid development of communication technology, military stealth technology, and highly integrated electronics, electromagnetic interference (EM) and information security issues are increasingly severe, placing more stringent demands on advanced Microwave Absorbing Materials (MAMs). The ideal microwave absorbing material not only needs to meet the core performance indexes such as light weight, broadband, strong absorption and the like, but also needs to have long-term stability and adaptability, such as corrosion resistance and the like, in the practical application environment, so as to ensure reliable operation under complex working conditions. When designing a high-performance corrosion-resistant wave-absorbing material, the excellent electromagnetic wave attenuation capability and chemical stability are required to be simultaneously provided, and how to realize corrosion resistance and strong absorption simultaneously through structural design and component optimization of the material is important to national defense safety. The carbon-based material such as graphene has the advantages of strong dielectric loss capacity, good chemical stability and the like, and is one of the most potential high-performance electromagnetic wave absorbing materials. However, the pure carbon material greatly prevents the improvement of the comprehensive electromagnetic wave absorption performance due to the characteristics of high conductivity, single loss mechanism, poor matching property and the like. Therefore, the construction of novel carbon-based composite wave-absorbing materials through structural and component optimization becomes a research hotspot. The silicate has rich variety, various structures, adjustable elements and chemical stability, can provide more choices for screening of the wave-absorbing material, can further optimize the impedance matching characteristic of the material due to the introduction of the magnetic elements, can improve the wave-absorbing capacity of the material through the magnetoelectric synergistic effect due to the compounding of the silicate and the graphene, and has corrosion resistance. However, how to design a composite wave-absorbing material that effectively combines magnetic elements and graphene and improves the wave-absorbing performance and corrosion resistance thereof is a technical problem that needs to be solved. Disclosure of Invention Aiming at the problems in the prior art, the invention provides a preparation method and electromagnetic wave absorption application of a hollow sea urchin-shaped Ni 3Si2O5(OH)4/RGO composite material. According to the invention, a hollow sea urchin-shaped Ni 3Si2O5(OH)4/GO intermediate is prepared by a hydrothermal method, and then a high-temperature reduction treatment is carried out to obtain the hollow sea urchin-shaped Ni 3Si2O5(OH)4/RGO composite material. By changing the addition amount and the annealing temperature of the graphene, the electromagnetic parameters of the material can be effectively regulated, and the wave-absorbing material with good impedance matching characteristics is obtained. The Ni 3Si2O5(OH)4/RGO composite material prepared by the method has a unique hollow sea urchin-shaped morphology, the special morphology has a larger specific surface area, a large number of heterogeneous interfaces can be formed between Ni 3Si2O5(OH)4 and Reduced Graphene Oxide (RGO), the polarization loss capacity is greatly enhanced, an air matching layer can be introduced into a hollow structure, the impedance matching characteristic is enhanced, and therefore the electromagnetic wave absorption effect of the material is improved. The result proves that the novel hollow sea urchin-shaped Ni 3Si2O5(OH)4/RGO composite material has excellent electromagnetic wave absorption performance, and the effective absorption bandwidth reaches 7 GHz under the matching thickness of 2.47 mm. In addition, the composite material has excellent corrosion resistance in a simulated seawater environment, and can be used as an excellent candidate material of a corrosion-resistant wave-absorbing material in the military stealth field. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The first aspect of the invention provides a preparation method of a hollow sea urchin-shaped Ni 3Si2O5(OH)4/RGO composite wave-absorbing material, which comprises the following steps: (1) Adding SiO 2 nano-particles and Graphene Oxide (GO) into deionized water, and fully stirring to fully mix the SiO 2 nano-particles and t