Synthesis of ZnO Crystals with Octahedral Morphology through Thermal Evaporation Technique in Air

Abstract

ZnO crystals with octahedral morphology were synthesized in large quantity using a simple thermal evaporation of ZnF 2 powder in air. No catalysts and impurities were not used in the synthetic process. Scanning electron microscopy image showed that the synthesized ZnO crystals were of well-defined octahedral shape with smooth surfaces. X-ray diffraction data revealed that the octahedral-shaped ZnO crystals had a hexagonal wurtzite structure. As the synthetic temperature increased, the crystal size increased without altering the octahedral morphology. Energy dispersive X-ray spectroscopy spectrum confirmed the high purity of the ZnO crystals. Two emission peaks at around 430 and 460 nm was observed in the cathodoluminescence spectrum of the octahedral-shaped ZnO crystals.