Synthesis of Ga-riched zinc gallate nanowires by reactive evaporation and the cathodoluminescence properties of individual nanowires

摘要

A facile Au-catalytic reactive evaporation method was developed to synthesize cubic zinc gallate (ZnGa_2O_4) nanowires through the reaction of Ga_2O_3 film and ZnO vapor at high temperature. The ZnGa_2O_4 nanowires are well crystalline and the length is up to tens of micrometers. The growth process follows typical vapor-liquid-solid (VLS) mechanism. All the cathodoluminescence (CL) spectra of individual nanowires reveal a strong, broad and asymmetric blue emission band centered at ca. 460 nm. It is thought that the excess Ga~(3+) is the main reason for the unusual blue emission properties.