Abstract
ZnO thin films were deposited using a simple, convenient and an inexpensive modified chemical bath method along with subsequent air annealing. The reaction mechanism for the growth of the ZnO nanostructure after the air annealing is also discussed. SEM observations reveal the formation of flowerlike nanostructures that are composed of leaf-like petals of thin nanosheets. The annealed ZnO nanostructures grow with the hexagonal crystal structure. The ZnO nanostructure exhibits a blue shift in its optical absorption spectrum. The room temperature photoluminescence study reveals UV emission peaks due to near band edge emissions along with defect related blue and green emission peaks.