Core-shell heterostructure magnetic nanowire as well as preparation method and application thereof

A heterostructure, magnetic nanotechnology, applied in the field of nanowire materials, can solve the problems of poor microwave absorption performance, strict equipment requirements, high temperature energy consumption, etc. The effect of oxidation and corrosion resistance

Active Publication Date: 2021-09-24
CHONGQING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of the above materials has disadvantages such as high temperature energy consumption, strict equipment requirements, harsh conditions, poor microwave absorption performance, and easy oxidation. Therefore, the development of simple composite materials with excellent microwave absorption performance has become a new research direction for researchers.

Method used

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  • Core-shell heterostructure magnetic nanowire as well as preparation method and application thereof
  • Core-shell heterostructure magnetic nanowire as well as preparation method and application thereof
  • Core-shell heterostructure magnetic nanowire as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of core-shell heterostructure magnetic nanowires, the specific preparation process is as follows figure 1 shown, including the following steps:

[0035] (1) Add ferromagnetic nanowires (FeNWs) into deionized water to prepare 100ml of ferromagnetic nanowire aqueous solution with a concentration of 20mmol / L, ultrasonically treat for 10min to disperse ferromagnetic nanowires evenly, then add 0.3g dispersant polyethylene Pyrrolidone (PVP) prevents agglomeration;

[0036] (2) Configure 100ml of silver nitrate solution with a concentration of 20mmol / L, add an equal amount of silver nitrate solution and ferromagnetic nanowire aqueous solution, stir for 10min to make it evenly mixed;

[0037] (3) Add a magnetic field device above the reaction tank to keep it parallel to the top of the reaction vessel, then add 100ml of hydrazine hydrate with a concentration of 2mol / L dropwise and let it stand for 30min to react.

[0038] (4) After being centrifuged, washed with ab...

Embodiment 2

[0041] The preparation of core-shell heterostructure magnetic nanowires specifically includes the following steps:

[0042](1) Add ferromagnetic nanowires (FeNWs) into deionized water to prepare 100ml of ferromagnetic nanowire aqueous solution with a concentration of 21mmol / L, ultrasonically treat for 10min to disperse ferromagnetic nanowires evenly, then add dispersant 0.15g glycerol, 0.15g ethylenediamine tetraacetate, 0.2g sodium nitrilotriacetate to prevent agglomeration;

[0043] (2) Configure 100ml of silver nitrate solution with a concentration of 23.1mmol / L, add an equal amount of silver nitrate solution and ferromagnetic nanowire aqueous solution, stir for 10min to make it evenly mixed;

[0044] (3) Add a magnetic field device above the reaction tank to keep it parallel to the top of the reaction vessel, then add 100ml of hydrazine sulfate with a concentration of 2.4mol / L dropwise and let it stand for 30min to react.

[0045] (4) After being centrifuged, washed with ...

Embodiment 3

[0048] The preparation of core-shell heterostructure magnetic nanowires specifically includes the following steps:

[0049] (1) Add ferromagnetic nanowires (FeNWs) into deionized water to prepare 100ml of ferromagnetic nanowire aqueous solution with a concentration of 18mmol / L, ultrasonically treat for 10min to disperse ferromagnetic nanowires evenly, then add dispersant 0.1g pyrophosphoric acid Sodium, 0.1g sodium ethylenediaminetetramethylene phosphate to prevent agglomeration;

[0050] (2) Configure 100ml of silver nitrate solution with a concentration of 5.4mmol / L, add an equal amount of silver nitrate solution and ferromagnetic nanowire aqueous solution, stir for 10min to make it evenly mixed;

[0051] (3) Add a magnetic field device above the reaction tank to keep it parallel to the top of the reaction vessel, then drop 100ml of formaldehyde with a concentration of 1.6mol / L and let it stand for 30min to react.

[0052] (4) After being centrifuged, washed with absolute e...

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Abstract

The invention discloses a core-shell heterostructure magnetic nanowire as well as a preparation method and application thereof and belongs to the technical field of nanowire materials. The core-shell heterostructure magnetic nanowire takes an iron nanowire as a core and takes silver as a shell, is prepared by combining a magnetic field-assisted induction liquid phase reduction method and a layer-island growth mode, and has excellent electrical conductivity, oxidation resistance, corrosion resistance and wave-absorbing performance. A molar ratio of Fe to Ag in a ferromagnetic nanowire in the core-shell heterostructure magnetic nanowire is 1 to (0.3-1.1); the minimum reflection loss reaches -58.69dB, and the effective absorption bandwidth with the reflectivity being smaller than or equal to -10dB is 5.78-13.10GHz. The core-shell heterostructure magnetic nanowire has the advantages of mild conditions, simple equipment, good repeatability, short period and large-scale production, and has wide application prospects in the aspects of microwave absorption, electro-catalysis, flexible transparent conductive films and surface enhanced Raman spectroscopy.

Description

technical field [0001] The invention relates to the technical field of nanowire materials, in particular to a magnetic nanowire with a core-shell heterostructure and a preparation method and application thereof. Background technique [0002] Ferromagnetic nanowires are a stack of nanomaterials in which nanoscale iron atoms are stacked and grown in a certain direction. The nanoscale size and unique structure make ferromagnetic nanowires exhibit many unique physical effects that bulk materials do not have, mainly including small size effect, surface interface effect, quantum size effect, etc. Among the existing preparation methods of nanowires, gas phase deposition method, template synthesis method, in-situ reduction method and the like are used. Existing preparation methods involve the synthesis of ferromagnetic nanowires with stable morphology and uniform structure. Iron is cheap, and monodisperse ferromagnetic nanowires have good electrical, thermal and mechanical propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F1/00B82Y30/00B82Y40/00C23C18/44H05K9/00G01N21/65
CPCC23C18/44B82Y40/00B82Y30/00H05K9/0081G01N21/658
Inventor 杨平安屈正微李锐黄宇轩黄鑫寿梦杰吴德成周志浩
Owner CHONGQING UNIV OF POSTS & TELECOMM
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