Growth and Characterization of Ni Nano-Micro Structures in the Presence of Ethylenediamine

Abstract

Ni nano-micro structures have been synthesized via a solution reduction route in the presence of ethylenediamine (EDA) under strong alkaline conditions. The phase composition, morphology, and microstructure of the resulting products are investigated by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The presence of EDA plays an important role in the formation of Ni nano-micro structures, and microflowers or microspheres assembled from nanosized horns can be produced by changing the amount of EDA. The size of Ni nano-micro structures is dependent on the NaOH concentration, and long chains assembled from Ni nano-micro structured microspheres can be obtained by reducing the amount of NaOH solution used. The role of both EDA and NaOH in the reduction of Ni (II) to Ni, as well as in the growth of Ni nano-micro structures, has been discussed, and a possible formation mechanism of these Ni nano-micro structures has been proposed based on the experimental results.

Promoting the Oxygen Evolution Reaction via Morphological Manipulation of a Lamellar Nanorod-Assembled Ni(II)-Pyrazolate Superstructure

“…These small spherical particles aggregate together into a large sphere due to the most prominent features of Ni, that is, dipolar interactions, magnetic property, and reduced surface energy. 36 However, with the increase in the ligand concentration (decreasing Ni/pyrazole ratio), an increase in the rate and extent of ligand exchange reactions between pyrazole and ethanol/nitrate ligands around metallic Ni 2+ centers is observed. Hence, a higher pyrazole concentration will lead to a Ni 2+ coordination sphere abundant with pyrazole ligand in a shorter period, resulting in an increased reaction rate of pyrazole deprotonation.…”

“…As there are a less number of deprotonated pyrazole ions, the nucleation rate is slower in a specific period due to fewer available nucleus clusters resulting in the small spherical particles. These small spherical particles aggregate together into a large sphere due to the most prominent features of Ni, that is, dipolar interactions, magnetic property, and reduced surface energy …”

Magneto-structural properties of rhombohedral Ni and Ni–B nanotubes deposited by electroless-plating in track-etched mica templates

“…Second, for depositing pure Ni, we chose hydrazine as a nonintrusive reducing agent in conjunction with nitrilotriacetic acid to stabilize the Ni(II) ions in the plating bath and prevent Ni(OH) 2 precipitation. With this specific ligand, 65 the otherwise commonly occurring Ni nanospike formation is suppressed, 65,66 allowing us to realize compact deposits and thus regular nanotube walls. Third, as the Ni surface films on the top and bottom surfaces of the mica templates would interfere with the magnetic anisotropy measurements of the perpendicularly aligned nanotubes, the seeds on the outer template surface were mechanically removed (Fig.…”

SYNTHESIS AND CHARACTERIZATION OF PbS NANOSTRUCTURES TO COMPARE WITH BULK

“…Also PbS nano has thousand time greater optical response of same size CdS nano. A number of methods can be followed to grow PbS nanostructure [10][11][12][13][14][15].Some of the methods cause environmental hazards and required high temperature [16][17][18][19][20]. Aliphatic ligands have stabilizing and passivating property [21][22].…”