Abstract
One-dimensional cobalt nanostructures with large aspect ratio up to 450 have been prepared via a template-free hydrazine reduction route under external magnetic field assistance. The morphology and properties of cobalt nanostructures were characterized by scanning electron microscopy, X-ray diffractometer, and vibrating sample magnetometer. The roles of the reaction conditions such as temperature, concentration, and pH value on morphology and magnetic properties of fabricated Co nanostructures were investigated. This work presents a simple, low-cost, environment-friendly, and large-scale production approach to fabricate one-dimensional magnetic Co materials. The resulting materials may have potential applications in nanodevice, catalytic agent, and magnetic recording.
Highlights
In recent years, nanostructure materials have been actively studied due to their novel properties and potential applications
Much attention has been focused on one-dimensional (1D) magnetic materials such as Fe, Co, and Ni due to their potential applications in nanodevice, biosensor, and magnetic recording [1,2,3]. 1D cobalt nanostructures with uniform shape and high purity have become increasingly required for specific uses in many areas, such as in high-density information storage, magnetic sensors, commercial batteries, and catalysts
The most common method to fabricate 1D Co nanostructures is based on porous anodic aluminum oxide (AAO) templates
Summary
Nanostructure materials have been actively studied due to their novel properties and potential applications. Various approaches have been developed to synthesize cobalt nanostructures [4,5,6]. Li et al prepared Co nanowire arrays in alumina arrays by using a chemical electrodeposition method [9]. Other templates such as polyaniline or polycarbonate membranes, diblock copolymer, and mesoporous silica have been applied to fabricate magnetic Co nanowires [10,11,12]. In view of the complexity of multi-step template preparation and low production, it is imperative to develop simpler templatefree methods for the fabrication of magnetic Co nanowires
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