Hydrothermal synthesis and magnetic properties of CoS2 nano-octahedrons

Uniform single-crystalline CoS2 nano-octahedrons have been prepared in high yield by a simple hydrothermal process. The octahedral structures exhibit a high geometric symmetry with smooth surfaces and the mean edge length is ~ 120 nm. X-ray diffraction, scanning electron microscopy, transmission electron microscopy were used to characterize the samples. Contrast experiments indicate that the capping agent poly(vinyl pyrrolidone) (PVP) and the complexing agent sodium citrate play important roles for the formation of octahedral CoS2 nanostructures. A possible formation mechanism was proposed based on the evolution of this morphology as a function of hydrothermal time. Additionally, the magnetic properties of the CoS2 nano-octahedrons were discussed in detail.

Graphical abstractUniform single-crystalline CoS2 nano-octahedrons have been fabricated in high yield by a facile PVP-assisted hydrothermal process. The octahedral structures exhibit a high geometric symmetry with smooth surfaces and the mean edge length is ~ 120 nm.The magnetic measurements revealed that the CoS2 nano-octahedrons were paramagnetic at high temperature and ferromagnetic at low temperature.Figure optionsDownload full-size imageDownload as PowerPoint slide