Preparation and characterization of Co_9S_8 nanocrystalline and nanorods

摘要

Hexagonal Co_9S_8 nanocrystal and nanorods were synthesized using cobalt chloride (CoCl_2 centre dot 6H_2O), dimethyl sulfoxide (DMSO) and non-aqueous alcohol as the starting materials, and taking dimethyl sulfoxide as both sulfur source and strong infiltrator in nanorods preparation. The Co_9S_8 samples were characterized by X-ray diffraction (XRD), scanning tunneling microscope (SEM), transmission electron microscope (TEM), vibrating sample magnetometer (VSM) and laser Raman spectrometer. The results show that the as-prepared Co9S8 nanocrystal with a size of 6 nm take on weak paramagnctism at room temperature. The lengths and diameters of the nanorods were about 4 mu m and 200 nm, respectively. The reason for the relative lower synthesis temperature of nanorods was discussed and a 'micro-autoclave reactor' model was suggested as well.