Room temperature synthesis and one-dimensional self-assembly of interlaced Ni nanodiscs under magnetic field

Abstract

Uniform and aligned nickel nanochains with interlaced-nanodiscs structure were first synthesized by using a template-free magnetic-field-assisted method at room temperature. The interlaced-disc nanochains were composed of nanodiscs with diameters of ∼90 nm and thicknesses of ∼10 nm. An attachment process has been proposed to explain the observed growth of the nanodiscs. With concentration of the OH− increased, the morphology of the products transforms from star- to interlaced-nanodisc-like nanochains. Systematic magnetic measurements demonstrate that the well-aligned interlaced-nanodisc-like Ni nanochains have coercivity of about 300 Oe and effective anisotropy of about five times more than the bulk value.