Orientation Growth and Magnetic Properties of Electrochemical Deposited Nickel Nanowire Arrays

Abstract

Highly ordered ferromagnetic metal nanowire arrays with preferred growth direction show potential applications in electronic and spintronic devices. In this work, by employing a porous anodic aluminum oxide template-assisted electrodeposition method, we successfully prepared Ni nanowire arrays. Importantly, the growth direction of Ni nanowire arrays can be controlled by varying the current densities. The crystalline and growth orientation of Ni nanowire arrays show effects on magnetic properties. Single-crystallinity Ni nanowires with [110] orientation show the best magnetic properties, including coercivity and squareness, along the parallel direction of the nanowire axis. The current preparation strategy can be used to obtain other nanowire arrays (such as metal, alloy, and semiconductor) with controlled growth direction in confined space, and is therefore of broad interest for different applications.

Magnetic Properties of Electrospun Magnetic Nanofiber Mats after Stabilization and Carbonization

“…Such magnetic nanofiber mats can be used, e.g., as catalysts [22], for magnetic hyperthermia [23], or electromagnetic shielding [24]. In contrast to other methods, such as electrodeposition [25,26], seed-mediated growth [27], magnetic field patterning of magnetic precursor inks printed on a substrate [28], or electrochemical deposition [29], electrospinning has the advantage Materials 2020, 13 of enabling preparation of large-scale nanofiber networks in short times without the necessity to use a cleanroom, highly sophisticated equipment, or highly toxic material, and is thus often used to prepare magnetic nanofibers [30][31][32][33][34]. Notably, polyacrylonitrile (PAN) can be spun from the low-toxic solvent DMSO [3], making the whole process relatively easy to handle and avoiding unnecessary environmental pollution.…”

Preparation of Nickel Nanowires and Effects of Synthesis Conditions on Their Morphology

“…The synthesis, characterization, and applications of nanoparticles are among the most important sections of the wide range of nanotechnology areas falling under the general "nanotechnology" umbrella. In recent years, nanoparticles have been the center of attention of researchers in the field as the transition from microparticles to nanoparticles was seen to lead to immense changes in the physical and chemical properties of a material [2]. Nickel nanorods with a diameter of 8-10 nm and length of 100-200 nm had been successfully prepared by the reduction of nickel chloride (NiCl 2 ) with hydrazine hydrate in water/ butanol/potassium oleate/kerosene microemulsion [3].…”

Наноструктурированные покрытия Ni на пористом оксиде алюминия: морфология, химическая структура и катодные свойства

“…Последние 10−15 лет различными научными группами исследуются наноструктуры никеля, полученные с использованием ПАОА. В частности, в работах На-польского [21], Proenca [22], Yu [23] исследуются нитевидные структуры никеля, полученные методом электрохимического осаждения. Но следует отметить, что использование таких материалов в качестве катодов для электролиза в щелочных электролитах не подходит, так как матрица оксида алюминия растворяется щелочами и электрод разрушается.…”