Synthesis of Zinc Oxide Nanostructures with Controlled Morphologies Using a Simple Sonochemical Method

Zinc oxide (ZnO) nanostructures were synthesized by a simple sonochemical method without the assistance of an additional surfactant. The morphologies can simply be controlled only by changing the addition sequence of NH 3 ·H 2 O. When NH 3 ·H 2 O was added before or at the beginning of the ultrasonic treatment, a flower‐like nanostructure and ellipsoidal particles self‐assembled by nanorods were obtained, respectively. The strong visible emission implied high atomic defects. The emission intensity was dependent on the addition sequence of NH 3 ·H 2 O greatly.