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One-dimensional olk-shell Ni@void@Co3O4@RGO wave-absorbing agent and preparation method thereof

A technology of wave absorbing agent and reducing agent, which is applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve the problems of difficult adjustment of the aspect ratio of one-dimensional structures, difficult design, and single preparation method, and achieves good application prospects and improvement. Absorbing performance, simple response effect

Pending Publication Date: 2021-07-02
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The difficulty in solving the above problems and defects is: the one-dimensional structure is difficult to control because of its length-to-diameter ratio, and the preparation method is complicated. It is still a difficulty in structure design and preparation, and there are relatively few reports in the literature.
There are also certain difficulties in the preparation of the yolk-shell structure, and the preparation method is relatively simple, so the design of the one-dimensional yolk-shell structure is even more difficult

Method used

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  • One-dimensional olk-shell Ni@void@Co3O4@RGO wave-absorbing agent and preparation method thereof
  • One-dimensional olk-shell Ni@void@Co3O4@RGO wave-absorbing agent and preparation method thereof
  • One-dimensional olk-shell Ni@void@Co3O4@RGO wave-absorbing agent and preparation method thereof

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preparation example Construction

[0046] The one-dimensional yolk-shell Ni@void@Co provided by the embodiment of the present invention 3 o 4 The preparation method of @RGO absorber includes:

[0047] NiCl 2 ·6H 2 O is nickel source, N 2 h 4 ·H 2 O is a reducing agent, and Ni nanowires are synthesized by chemical reduction;

[0048] The phenolic resin RF layer was coated on the outside of Ni nanowires by in-situ polymerization of resorcinol and formaldehyde to obtain one-dimensional Ni@RF nanowires;

[0049] Growth of Co(OH) on the surface of Ni@RF nanowires by oil bath reflux method 2 nanosheets, and then annealed in air into Co 3 o 4 Nanosheets; coated phenolic resin RF reacts with air and is removed to obtain Ni@void@Co with flower-like surface yolk-shell structure 3 o 4 Nanowires;

[0050] Preparation of Ni@void@Co by homogeneously mixing nanowire and graphene suspensions and performing hydrothermal reaction 3 o 4 / RGO Composite.

[0051] Such as figure 1 As shown, the one-dimensional yolk-s...

Embodiment 1

[0071] The one-dimensional yolk-shell Ni@void@Co provided by the embodiment of the present invention 3 o 4 The preparation method of @RGO wave absorbing agent comprises the following steps:

[0072] (1) Preparation of one-dimensional Ni nanowires: Dissolve 1.2g NaOH in 35mL ethylene glycol, stir for 1h, add reducing agent 10mL hydrazine hydrate solution into the solution, and continue stirring for 0.5h. The mixed solution was placed in an 80°C constant temperature water bath with an external magnetic field, and then 15 mL of NiCl was slowly added dropwise to it with a syringe 2 ·6H 2 O ethylene glycol solution (0.1mol / L). After standing for 5 min, the Ni nanowires were collected by a magnet, washed three times with absolute ethanol and deionized water, and finally freeze-dried at -60 °C.

[0073] (2) Preparation of one-dimensional Ni@RF nanowires: Under ultrasonic treatment, 0.06 g Ni nanowires were dispersed in a mixed solution of 70 mL deionized water and 28 mL absolute ...

Embodiment 2

[0076] The one-dimensional yolk-shell Ni@void@Co provided by the embodiment of the present invention 3 o 4 The preparation method of @RGO wave absorbing agent comprises the following steps:

[0077] (1) Preparation of one-dimensional Ni nanowires: Dissolve 1.2g NaOH in 35mL ethylene glycol, stir for 1h, add reducing agent 10mL hydrazine hydrate solution into the solution, and continue stirring for 0.5h. The mixed solution was placed in an 80°C constant temperature water bath with an external magnetic field, and then 15 mL of NiCl was slowly added dropwise to it with a syringe 2 ·6H 2 O ethylene glycol solution (0.1mol / L). After standing for 5 min, the Ni nanowires were collected by a magnet, washed three times with absolute ethanol and deionized water, and finally freeze-dried at -60 °C.

[0078] (2) Preparation of one-dimensional Ni@RF nanowires: Under ultrasonic treatment, 0.06 g Ni nanowires were dispersed in a mixed solution of 70 mL deionized water and 28 mL absolute ...

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Abstract

The invention belongs to the technical field of wave absorbing agents, and discloses a one-dimensional olk-shell Ni@void@Co3O4@RGO wave absorbing agent, a preparation method and application thereof, preparation of a one-dimensional Ni nanowire, preparation of a one-dimensional Ni@phenolic aldehyde (Ni@RF) nanowire and preparation of a Ni@void@Co3O4 nanowire. The one-dimensional Ni nanowire is prepared through a chemical reduction method, the one-dimensional Ni nanowire is coated with a phenolic resin layer and a Co(OH)2 nanosheet layer, the one-dimensional Ni nanowire is calcined in air to obtain a one-dimensional Ni@void@Co3O4 nanowire, the one-dimensional Ni@void@Co3O4 nanowire is compounded with reduced graphene to obtain the final composite wave-absorbing agent, and the composite wave-absorbing agent is novel in structure and excellent in performance. The wave-absorbing agent prepared by the method is excellent in performance and has a good application prospect. In the Ni@void@Co3O4 nanowire with the layered structure, the magnetic Ni nanowire in the Ni@void@Co3O4 nanowire is used for generating active magnetic loss, and the flower-shaped Co3O4 nanosheet and the RGO nanosheet support dielectric loss.

Description

technical field [0001] The invention belongs to the technical field of wave absorbing agents, in particular to a one-dimensional yolk-shell Ni@void@Co 3 o 4 @RGO absorber, preparation method and application. Background technique [0002] At present, while microwave technology such as wireless communication equipment brings a lot of convenience to human beings, it also brings some electromagnetic pollution problems. Electromagnetic pollution not only poses a threat to human health, but also leads to the use of electronic equipment, which has become a new type of environmental pollution. Therefore, it is of great significance to develop a material that can effectively absorb electromagnetic waves. [0003] Single-component absorbers have poor performance and cannot meet the requirements of "thin, light, wide, and strong" ideal absorbers. Therefore, composite absorbers with multiple loss mechanisms acting together are the mainstream of current research. One-dimensional magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081H05K9/0086
Inventor 马明亮童周禹刘燕燕毕宇欣王荣珍陈燕
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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