Synthesis of Co3O4 nanowires on nickel foam by a novel microwave-assisted template-free method

Spinel cobalt oxide (Co3O4) nanowires grown on Ni foam are successfully synthesized using a novel microwave-assisted template-free method. The effect of reaction temperature, concentration of reactants, and reaction time on the morphology and crystalline structures of the prepared nanowires is studied. The present work has demonstrated that uniform Co3O4 nanowires with diameters of 500–580 nm and lengths of 6–8 μm can be synthesized under proper reaction condition. Moreover, the proposed microwave-assisted template-free method can significantly reduce reaction time, increase reaction efficiency, and provide better control over the geometry of the nanostructures.

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► Spinel cobalt oxide (Co3O4) nanowires grown on Ni foam.
► Microwave-assisted template-free method is investigated.
► Factors such as temperature, reactant concentration, time are studied.
► Microwave-assisted template-free method reduces reaction time and increases reaction efficiency.