“…Various morphologies of CuO NSs have already been synthesized, such as nanospheres, nanorods (NRs) [26,27], nanowires [28], nanosheets [29], nanoplatelets, nanoribbons, and flower-like [13], sheaf-like, dendritic, and spherical NSs. Morphology-dependent properties have also been investigated, such as catalytic, electrical, and magnetic, in comparison to their counterparts [23,30]. For example, Wei Che et al [31] reported that the catalytic activity of CuO NSs gradually decreased when the morphology changed from leaf-like to flower-like and dumbbell-like structures.…”