Improved Magnetic Anisotropy of Monodispersed Triangular Nickel Nanoplates

Abstract

Monodispersed triangular Ni nanoplates were successfully synthesized based on a facile thermal decomposition method. The Ni nanoplates have an average edge length of 15.4 nm, and their thickness is about 6 nm. Owing to high anisotropic structures, the Ni nanoplates exhibit typical ferromagnetic behaviors at room temperature. The blocking temperatures of the Ni nanoplates are over 400 and 226 K when the applied field is 100 and 500 Oe, respectively. Compared with bulk Ni, the Ni nanoplates exhibit significant increase in magnetic anisotropy due to the presence of shape anisotropy and the reduction in particle size. These nickel nanoplates are expected to bring new opportunities in application of magnetic storage and catalysis.

Synthesis of Size-Tunable Monodispersed Metallic Nickel Nanocrystals without Hot Injection

“…To overcome this problem, nonaqueous approaches have been developed as alternatives to aqueous systems. [9][10][11][12] The nonaqueous methods, however, often require a large amount of surfactants for controlling the growth and crystal size of the products. Furthermore, complex devices with protective atmosphere are needed to inject rapidly precursors into a hot organic reaction medium.…”

“…Furthermore, complex devices with protective atmosphere are needed to inject rapidly precursors into a hot organic reaction medium. [9][10][11][12] Another problem with hot injection is that the Ni nanoparticles prepared are usually amorphous 10 or poorly crystallized. 13,14 Additional treatment steps are therefore required to achieve good crystallinity.…”

Morphology-dependent nanocatalysis: metal particles

“…12F) were synthesized by thermal decomposition of Ni(COOH) 2 in a mixed solution of OA, oleyl amine, and octadecene. 105 The small triangular nanoplate further grew along the [110] direction or connected along the [110] lateral plane, forming large triangular or hexagonal nanoplates. Ni nanorods with a diameter of 4 nm and a length of 15 nm (Fig.…”

Microwave-assisted synthesis of icosahedral nickel nanocrystals

“…[10][11][12][13] These nanostructures have demonstrated increased magnetic and catalytic properties owing to their high shape anisotropy compared to their spherical counterparts. For example, nanoplatelets synthesised by Xu et al were found to have coercivities of up to 120 Oe at room temperature.…”