Preparation method of metal core-shell nanowire

A core-shell nano and metal technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of large demand for experimental equipment, affecting material performance, and difficult control of conditions, etc., to achieve operability Strong, simple and convenient, and the effect of promoting development

Active Publication Date: 2019-05-21
NINGBO ZHETIE JIANGNING CHEM
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Problems solved by technology

However, the synthesis of core-shell nanowires by the above methods requires relatively large experimental equipment and is difficult to operate.
[0006] The second method is a method commonly used by most researchers, and most of them are based on the template method. The difficulty lies in the preparation of nanotubes.
However, due to the introduction of impurities, the easy magnetization direction of Ni

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  • Preparation method of metal core-shell nanowire

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preparation example Construction

[0045] A preparation method for preparing metal core-shell nanowires, comprising the following steps:

[0046] (a) Template preparation

[0047] Aluminum sheet annealing and ultrasonic cleaning pretreatment: anneal the aluminum sheet (thickness 50-60 μm) at 450-550°C for 2-4 hours, then ultrasonicate in acetone for 5-15 minutes, and then soak in alkaline solution for 5-10 minutes. Finally, ultrasonication in acetone for 3 to 5 minutes completes the pretreatment.

[0048] (a-1) Primary oxidation: place the aluminum sheet pretreated by annealing and ultrasonic cleaning in 0.3-0.5mol / L oxalic acid aqueous solution, and electrochemically corrode it for 4-6 hours at a voltage of 40-60V and a temperature of 0-3°C , to obtain primary alumina flakes;

[0049] (a-2) Removal of the primary oxide film: Take the primary alumina sheet, soak it in a mixed aqueous solution of phosphoric acid and chromic acid at 50-70°C for 12-16 hours, and then clean it with deionized water to obtain the a...

Embodiment 1

[0065] Potentiostatic Preparation of Co-Ni Core-Shell Nanowires

[0066] 1) Template preparation:

[0067] (1-1) Primary oxidation: Place the aluminum sheet pretreated by annealing and ultrasonic cleaning in 0.4mol / L oxalic acid aqueous solution, and electrochemically corrode for 5 hours at a voltage of 50V and a temperature of 1°C to obtain a primary aluminum oxide sheet.

[0068] (1-2) Removing the primary oxide film: take the primary alumina sheet, soak it in a mixed aqueous solution of phosphoric acid and chromic acid at 60°C for 14 hours, and then clean it with deionized water to obtain the aluminum sheet from which the primary oxide film has been removed.

[0069] In the mixed aqueous solution of phosphoric acid and chromic acid, the concentration of phosphoric acid is 4.5wt%, and the concentration of chromic acid is 1.5wt%.

[0070] (1-3) Secondary oxidation: Place the aluminum sheet from which the primary oxide film has been removed in 0.4mol / L oxalic acid aqueous sol...

Embodiment 2

[0079] Pulse electrodeposition prepares the method for Co-Ni core-shell nanowire (step (2) adopts pulse electrodeposition), comprises the steps:

[0080] (1) Template preparation:

[0081] (1-1) Primary oxidation: Place the aluminum sheet pretreated by annealing and ultrasonic cleaning in 0.3mol / L oxalic acid aqueous solution, and electrochemically corrode for 6 hours at a voltage of 40V and a temperature of 0°C to obtain a primary aluminum oxide sheet.

[0082] (1-2) Removing the primary oxide film: take the primary alumina sheet, soak it in a mixed aqueous solution of phosphoric acid and chromic acid at 50°C for 16 hours, and then clean it with deionized water to obtain the aluminum sheet from which the primary oxide film has been removed.

[0083] In the mixed aqueous solution of phosphoric acid and chromic acid, the concentration of phosphoric acid is 3wt%, and the concentration of chromic acid is 2wt%.

[0084] (1-3) Secondary oxidation: Place the aluminum sheet from whi...

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Abstract

The invention relates to the field of nanometer materials and discloses a preparation method of a metal core-shell nanowire. The preparation method comprises the step of template preparation, specifically, preparing an anodized alumina template; (b) conducting electro-deposition on a nanotube; (b-1) preparing a salt bridge; (b-2) sputtering of a conducting layer, specifically, conducting sputtering on the anodized alumina template to form a copper film; (b-3) conducting traditional constant-potential electro-deposition or pulse electro-deposition; (c) conducting secondary electro-deposition toprepare a magnetic metal core-shell nanowire; and (d) releasing the metal core-shell nanowire. The metal core-shell nanowire prepared through the method is clear in core-shell structure. The thickness of a shell layer and the thickness of a core layer in the core-shell nanowire can be controlled conveniently. The preparation method is high in operability and easy and convenient to implement and has the positive promotion effect on development of multifunctional materials and magnetic materials.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a method for preparing metal core-shell nanowires. Background technique [0002] In recent years, one-dimensional magnetic nanomaterials have received extensive attention. Due to their excellent magnetic properties and nano-quantum effects, one-dimensional magnetic nanomaterials are widely used in surface catalysis, sensor devices, microwave absorption, ultra-high-density magnetic recording and other fields. [0003] Different from magnetic element or alloy nanowires, magnetic core-shell nanowires are much less in terms of preparation methods and related performance research. The main reason is that their structures are relatively complex and difficult to prepare. It is difficult to effectively control its structure. It is even more difficult to obtain highly ordered core-shell nanowire arrays. However, compared with magnetic element or alloy nanowires, it has more excellent...

Claims

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Application Information

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IPC IPC(8): C25D3/12C25D3/56C25D5/18C25D11/04C25D11/08C25D11/10C25D11/12C25D11/24B22F1/00B82Y30/00B82Y40/00
Inventor 毛正余胡新跃胡军
Owner NINGBO ZHETIE JIANGNING CHEM
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