Facile synthesis of high porous NiO nanostructures by hydrothermal method

Abstract

In this report, the simple hydrothermal approaches to the fabrication of porous NiO nanostructures including nanospheres and nanotoroids were described.  Morphologies and crystal structure of the as-fabricated nanomaterials were characterized by various techniques such as SEM, TEM, XRD, EDS, and N₂ adsorption/desorption isotherm. The results showed that the porous NiO nanospheres have the diameter ranging from 2 to 10 µm, which are self-assembled nanoparticles (NPs). The nanotoroids have an average outer particle diameter and iner diameter are of ~300 nm and ~60 nm, respectively. This simple and mild approach to fabricate highly porous NiO nanostructures could be easily scaled up and potentially extended to the synthesis of other porous nanostructured metal oxides.