Nanowires-assembled CuO Interpenetrated-leaf Architecture by ( ) Twinning

High-resolution transmission electron microscopy characterization demonstrates that the petal-like complex three-dimensional (3D) CuO nanomaterial produced by self-assembly in low-temperature wet-chemical synthesis has a unique interpenetrated-leaf structure. The primary leaf consisting of semi-coherent CuO nanocrystallites was formed by bundling, coalescence, and hydrolysis of amorphous Cu (OH)2 nanowires. The petal-like CuO was constructed by growing the secondary leaf on the primary one with a twin relationship ( )[010]p//( )[ ]s between them and the twin axis is [101]. The co-axis ⟨010⟩ of leaves is the growth orientation. The 3D complex nanostructure is different from normal low-dimensional nanostructures, e.g. nanorods, nanorings, regarding the formation mechanism and inherent structure.