Synthesis of ZnGa2O4 Hierarchical Nanostructure by Au Catalysts Induced Thermal Evaporation

In this paper, ZnGa₂O₄ hierarchical nanostructures with comb-like morphology are fabricated by a simple two-step chemical vapor deposition (CVD) method: first, the Ga₂O₃ nanowires were synthesized and employed as templates for the growth of ZnGa₂O₄ nanocombs; then, the as-prepared Ga₂O₃ nanowires were reacted with ZnO vapor to form ZnGa₂O₄ nanocombs. Before the reaction, the Au nanoparticles were deposited on the surfaces of Ga₂O₃ nanowires and used as catalysts to control the teeth growth of ZnGa₂O₄ nanocombs. The as-prepared ZnGa₂O₄ nanocombs were highly crystallized with cubic spinel structure. From the photoluminescence (PL) spectrum, a broad band emission in the visible light region was observed of as-prepared ZnGa₂O₄ nanocombs, which make it promising application as an optical material.