title: Synthesis and self-assembled ring structures of Ni nanocrystals.
abstract: Narrow size distribution Ni nanocrystals with average diameters from 5 to 13 nm ( approximately 20% standard deviation) and a face-centered cubic (fcc) structure were synthesized via rapid thermo-decomposition in the presence of surfactants in solution. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) were used to characterize these nanocrystals. It was found that the solvent determined the rate of the decomposition of Ni precursors, while the surfactants controlled the size and shape of Ni nanocrystals. A three-step process was proposed to explain the synthesis. The purified Ni nanocrystals readily formed micrometer-sized ring structures on TEM grids after solvent evaporation (hexanes), and the magnetic field was found to increase the density of the rings.
authors: Department of Chemistry, University of California, Davis, CA 95616, USA.
authors: Guangjun
authors: G
authors: Cheng
authors: Victor F
authors: VF
authors: Puntes
authors: Ting
authors: T
authors: Guo