Large-scale synthesis of Ga2O3 nanoribbons by a two-step gas flow control

β-Ga2O3 nanoribbons have been prepared by a two-step gas flow control, involving adjusting the pressure inside the tube before and after the formation of the nanoribbons. In different temperature areas, separated nanoribbons and nanowires were obtained, which grew via solid–liquid–vapor–solid (SLVS) and vapor–liquid–solid (VLS) mechanisms, respectively. The samples obtained were characterized by means of scanning electron microscopy, transmission electron microscopy, micro-Raman scattering, and photoluminescence. It was found that Ga2O3 nanoribbons had a perfect monoclinic single-crystal structure with a [002] growth direction. The Ga2O3 nanoribbons give ultraviolet, cyan and green light emission at room temperature under excitation at 254 and 325 nm.