Figure 4
From: Synthesis of ZnGa2O4 Hierarchical Nanostructure by Au Catalysts Induced Thermal Evaporation
Schematic illustration of growth process for ZnGa2O4 nanocombs. Stage I: arranged Au nanoparticles on the Ga2O3 nanowires after annealing; Stage II–III: during the heating process, Au provides preferential site for nucleation and 1-D growth; Stage IV: due to the gradually consumption of Ga source and the mass diffusion of reactant adatoms on the side surface, continuous growth resulting in the formation of tapered teeth