Abstract
Abstract Hierarchical copper oxide particles have attracted recent research interest, due to their structure, properties, and potential applications in catalysis, gas sensing, solar cells, biosensors, and lithium ion batteries. In this study, we synthesized hierarchical copper oxide (CuO/Cu 2 O) structures with various morphologies via electrically induced explosions of Cu wire in a liquid. This method does not require a surfactant or template and can be completed at room temperature. In this process, particle size and shape can be controlled by varying the energy supplied in the solution during the explosion. Leaf-like, flower-like, and rod structures were generated, composed of needle-like building blocks, via self-assembly and Ostwald ripening. Particle structure and morphology were investigated using X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and field emission scanning electron microscopy. The resistance of copper oxide film prepared via spin coating was measured. The optical band gap was determined using ultraviolet/visible spectroscopy.
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