Hydrothermal synthesis of NiS nanobelts and NiS2 microspheres constructed of cuboids architectures

NiS nanobelts of hexagonal phase have been hydrothermally synthesized starting from Ni(CH3COO)2·4H2O and Na2S2O3·5H2O at 200 °C for 12 h. The as-prepared nanobelts were 50 nm thick, 70–200 nm wide and more than 10 μm long. As ethylenediaminetetraacetic acid (EDTA) added, in similar condition, 2 μm NiS2 microspheres of cubic phase were prepared. However, as Ni2+/View the MathML sourceS2O32- ratio was 1:1 and the temperature was decreased to 160 °C, 5 μm NiS2 microspheres constructed of cuboids were formed.