Microstructure and micro-Raman studies of nitridation and structure transition of gallium oxide nanowires

► Nitridation and structure transition of Ga2O3 significantly depend on temperature. ► GN bonds form at lower temperatures but the Ga2O3 lattice is still dominant. ► Amorphous GaN coexists with crystalline Ga2O3 at higher temperatures. ► Crystalline GaN with distinct morphology is obtained at much higher temperatures.