Abstract: Well-aligned arrays of monocrystal ZnO nanorods were successfully synthesized using zinc powder thermal evaporation method at different airflow directions.The morphologies were characterized by SEM,XRD,SAED,HRTEM and PL.The results showed that ZnO nanorods possess hexagonal crystal structure.The nanorods grow along the direction of ,and the shape of them is whole hexagon when Zn vapor and Ar gas flow at the same direction and hexagonal cone at opposite direction.The difference of top shape depends on the di...