Synthesis and characterization of ferromagnetic iron-cobalt nanocluster wires and semiconductor zinc sulfide nanowires

Abstract

Synthesis and Characterization of Ferromagnetic Iron-Cobalt Nanocluster Wires We present one-step synthetic method that the vapor from a solution mixture of dicobalt octacarbonyl ($Co_2(CO)_8$) and iron pentacarbonyl ($Fe(CO)_5$) is thermally decomposed by using a nichrome wire in a vacuum chamber. The silicon substrate is placed in a homogeneous magnetic field which is produced by two permanent magnets, so that the nanowires easily grow in the direction of the magnetic flux. From XRD, SEM and TEM, we confirmed that these have a body-centered-cubic (BCC) structure with the magnetization easy axis of [110] direction, and a diameter in the range of 40 to 50 nm with a few micrometers in length. Also, the squareness of the hysteresis loop is 61% for magnetic fields parallel to the wires and the coercivity along the easy axis is 745 oersteds by using vibrating scanning magnetometer (VSM). Synthesis and Characterization of Semiconductor Zinc Sulfide Nanowires We present a new method for synthesis of zinc sulfide nanowires by a simple and safe reaction of zinc oxide and iron sulfide powders on a gold-coated silicon substrate through chemical vapor transport and condensation. High quality ZnS nanowires with single crystalline wurtzite structures are grown along [001] direction with diameters in the range of 10 - 40 nm and lengths up to tens of micrometers. Photoluminescence spectrum shows strong emission near 339 nm. These nanowires with cleaved ends could be a prominent candidate material for a nanoscale cavity as a ultra-violet nanolaser.