In this paper, NiCo2O4 nanoparticles were synthesized by three different methods. The applied preparation methods in this research are thermal decomposition of a mixed oxalate precursor, combustion synthesis and hydrothermal method. The crystalline phase, morphology and specific surface area (BET) of the resultant samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and nitrogen physical adsorption, respectively. The research found that the hydrothermal method is a promising method to prepare NiCo2O4 nanoparticles.
In this paper, a facile hydrothermal method has been developed for preparation of micro/nano structures of ZnS microspheres and ZnO microrods. The morphologies and crystalline structures were confirmed by scanning electron microscopy (SEM) and X-ray diffraction spectrum (XRD). In the co-existence of cysteine and hexamethylenetetramine (HMTA), we observed the competitive growth of ZnS and ZnO microstructures, and found that higher temperature was benefited for the formation of ZnS structures. This method may be applied for synthesis of other metal compound micro-nano structures with other metal ions. ZnS and ZnO semiconductor nanostructures as often-used photo-catalyst, we also compared their catalytical activity toward to the photo-degradation of methylene blue.
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