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A kind of plasmon resonance electromagnetic enhanced bimetallic-dielectric heterogeneous material and its preparation and application

A plasmon resonance, heterogeneous material technology, applied in metal material coating process, metal processing equipment, transportation and packaging, etc., to achieve the effect of easy industrial application and popularization, cheap and easily available raw materials, and significant microwave electromagnetic enhancement effect.

Active Publication Date: 2020-08-07
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, plasmon resonance is limited to noble metals such as Au, Ag, Cu, etc., and there are no reports on iron and cobalt elements; and the resonance wavelength is mainly in the visible band, near-infrared region, and ultraviolet region, while the plasmon resonance behavior in the microwave region has not been reported in the literature.

Method used

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  • A kind of plasmon resonance electromagnetic enhanced bimetallic-dielectric heterogeneous material and its preparation and application
  • A kind of plasmon resonance electromagnetic enhanced bimetallic-dielectric heterogeneous material and its preparation and application
  • A kind of plasmon resonance electromagnetic enhanced bimetallic-dielectric heterogeneous material and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 2.67g (225mM) CoCl 2 ·6H 2 O and 2g (1M) NaOH were dissolved in 50 mL distilled water. Then 15mL of 85% hydrazine hydrate (N 2 H 4 ·H 2 O) Add to the solution as a reducing agent. After stirring vigorously for 20 minutes, it was transferred to a stainless steel autoclave, kept at 120°C for 4 hours, and then cooled to room temperature. The final product collected by the magnet was washed three times with distilled water and ethanol, and dried under vacuum at 35°C for 12 hours to obtain a precursor of graded flower-like Co.

[0029] Add 3mL Fe(CO) to the Ark 5 Place it at the air inlet, divide 0.5 g of flower-shaped Co into two parts and spread them on the bottom of the ark, and place the two arks in the heating zone of the tube furnace. Incubate at 250℃ for 2 hours under the protection of argon, heating rate 5℃·min -1 . Finally, the Co-Fe heterostructure is obtained, which is a plasmon resonance electromagnetic enhanced bimetal material.

[0030] The phase of the plasmon r...

Embodiment 2

[0032] 2.67g (225mM) CoCl 2 ·6H 2 O and 2g (1M) NaOH were dissolved in 50 mL distilled water. Subsequently, 15 mL of 85% hydrazine hydrate (N 2 H 4 ·H 2 O) Add to the solution as a reducing agent. Stir vigorously, then transfer to a stainless steel autoclave at 120°C for 4 hours, and then cool to room temperature. The final product was collected by the magnet and washed several times with distilled water and ethanol, and then vacuum dried at 35°C for 12 hours. A precursor of graded flower-shaped Co is obtained.

[0033] The morphology observed under the scanning electron microscope is like Picture 10 As shown, the product is flower-like Co, and the flower-like Co is 6.96-14.53 μm long. Its magnetostatic properties such as Image 6 As shown, the saturation magnetization is 154.31emu·g -1 , The coercivity is 215.56G; its electromagnetic parameters such as Figure 7~8 As shown, the real part and imaginary part of the dielectric constant are 9.2~9.6 and -0.005~0.06 respectively in...

Embodiment 3

[0035] Same steps as in Example 1, but add 1mL Fe(CO) 5 .

[0036] The morphology observed under the scanning electron microscope is like Picture 12 As shown, the product is a Co-Fe heterostructure, the flower-like Co is 7.85-16.33 μm long, and Fe nanocrystals are evenly distributed on the surface. Its energy spectrum is like Figure 5 As shown, the cobalt-iron atomic ratio is 21.08; the C atomic percentage is 11.0%. Its magnetostatic properties such as Image 6 As shown, the saturation magnetization is 149.09emu·g -1 , The coercivity is 213.82G. Its electromagnetic parameters such as Figure 7~8 As shown, in the frequency range of 2-18 GHz, the real and imaginary parts of the dielectric constant are increased by 0.95-2 and 40-125 times relative to the graded flower precursor Co, respectively, and the real and imaginary parts of the permeability are relative to the graded flower The shape precursor Co increased by 0.4-1 and 1.5-8.8 times, respectively. Its two-dimensional refl...

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Abstract

The invention is a plasma resonance electromagnetic enhanced bimetal-dielectric heterogeneous material and its preparation and application. Fe / C nanocrystals were grown on the surface of fibrous or flower-like Co particles by chemical vapor deposition to form a Co / Fe / C bimetallic-dielectric heterogeneous material with a strawberry-like surface. Co / C and Fe / C metal-dielectric interfaces are propagating and localized surface plasmons, respectively. Under the action of an external electromagnetic field, the free electrons in cobalt and iron do collective resonance oscillation, resulting in a plasmon resonance effect. At the same time, a strong local electromagnetic field enhancement effect is generated at the Co / C and Fe / C metal-dielectric interface. The Co / Fe / C bimetal-dielectric heterogeneous material exhibits excellent lightweight broadband absorption characteristics. The design idea of ​​the material of the present invention is novel, and the electromagnetic parameters are significantly enhanced, and the obtained heterogeneous material will have broad application prospects in the fields of shielding, microwave absorption, magnetic sensor, detection, bioseparation or medical imaging; the formation mechanism of the method of the present invention is novel, The process is simple and the composition is easy to control.

Description

Technical field [0001] The invention relates to the field of electromagnetic functional materials, in particular to a method for designing, preparing and using a bimetal-dielectric heterogeneous material with plasma resonance electromagnetic enhancement and broadband light microwave absorption. Background technique [0002] Surface plasmon resonance is a physical optical phenomenon. According to Drude's theory, there are a large number of free electrons in some precious metals such as Au, Ag and Cu. The vanishing wave when light is totally reflected at the two-phase interface can trigger the free electrons on the metal surface to generate surface plasma. When the incident angle or wavelength is an appropriate value, the frequency and wavenumber of the surface plasmon and the evanescent wave are equal, and the two will resonate, forming a collective oscillation of electrons. The incident light is absorbed, and the reflected light energy drops sharply. A resonance peak appears in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02C23C16/16
CPCC23C16/16B22F1/0553B22F1/054B22F1/17
Inventor 童国秀刘琳胡潘冰乔儒孙嘉诚宫培军何茹佳陈锦绣吴文华
Owner ZHEJIANG NORMAL UNIVERSITY
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