Effect of ultrasonic irradiation time on ZnO nanostructures prepared by solution-immersion method

In this work, we report an optimisation of ultrasonic irradiation time on the synthesis of ZnO thin films to the photoluminescence (PL), surface morphologies and structural properties of ZnO on gold-seeded Si substrate. Surface morphology of the thin films was studied using field emission scanning electron microscope (FESEM). The photoluminescence and structural properties are observed using PL-Raman spectroscopy. Clusters of ZnO nano-flower with serrated broad petals consist of porous like structure (diameter 30-60 nm) were interestingly formed. This structure is seemingly not affected by the changes of ultrasonic irradiation time. These properties are especially useful for optoelectronic devices.