Growth of hierarchical based ZnO micro/nanostructured films and their tunable wettability behavior

► A simple two step method was adopted to fabricate hierarchical ZnO nanostructured film onto different annealed ZnO seed layer films. ► The surface morphology analysis revels the formation of complex hierarchical ZnO structured films with plates to hexagonal rod crystal and to tube-like structure without any surface modification and treatments. ► The present approach demonstrates its potentiality for low-temperature and large-scale synthesis of hierarchical ZnO films for future self-cleaning application.