Preparation method of metal core-shell nanowire

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...

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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 nanotubes has changed, which seriously affects the performance of the material.

Ni / Cu core-shell nanowires were synthesized by constant potential electrodeposition, but because the conditions in the process of preparing Ni tubes by constant potential deposition are difficult to control, it is easy to get all Ni nanowires or only a small part of Ni tubes and With the continuous hydrogen evolution reaction

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