Abstract
Abstract Nickel nanowires with large aspect ratio of up to 300 have been prepared by a hydrazine hydrate reduction method under applied magnetic field. The diameter of nickel nanowires is about 200 nm and length up to 60 μm. The role of magnetic field on the growth of magnetic nanowires is discussed and a magnetic nanowire growth mechanism has been proposed. Nickel ions are firstly reduced to nickel atoms by hydrazine hydrates in a strong alkaline solution and grow into tiny spherical nanoparticles. Then, these magnetic particles will align under a magnetic force and form linear chains. Furthermore, the as-formed chains can enhance the local magnetic field and attract other magnetic particles nearby, resulting finally as linear nanowires. The formation and the size of nanowires depend strongly on the magnitude of applied magnetic field.
Highlights
Morphological control in nanostructures has become a key issue known that template-based methods are not facile and it in the preparation of electronic, photonic devices as well as is difficult to synthesize a large amount of nanomaterials using functional materials [1,2]
It is obvious that the Ni nanowires are assembled to 1-D solid linear structure under an applied magnetic field
Since external magnetic fields played a very important role in formation of 1-D magnetic Ni nanowires [19,21], we investigated the products prepared without applying magnetic fields
Summary
Morphological control in nanostructures has become a key issue known that template-based methods are not facile and it in the preparation of electronic, photonic devices as well as is difficult to synthesize a large amount of nanomaterials using functional materials [1,2]. Magnetic field dependence of the morphology as well as the formation process of Ni nanowires. The proposed mechanism may further shed light on the fabrication approach on magnetic nanowires with high quality.
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