In this report, a simple hydrothermal approach to the fabrication of porous NiO nanospheres and nanotoroids was described. The morphologies and crystal structure of the as-fabricated nanomaterials were characterized using 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, and they are self-assembled nanoparticles (NPs). The nanotoroids have an average outer diameter and inner diameter 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.
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