Single‐Crystal Hexagonal Disks and Rings of ZnO: Low‐Temperature, Large‐Scale Synthesis and Growth Mechanism

Solution-phase synthesis of single-crystal ZnO disks and rings was achieved in high yield at low temperature (70–90 °C) by using an anionic surfactant as a template. The reaction can be controlled by means of the growth temperature and the molar ratio of reagents to favor formation of disks or rings. A growth mechanism is proposed on the basis of structural information provided by SEM and TEM.