“…22,23 Due to the wide application prospect of β-Ga 2 O 3 , its synthesis in the form of nanoparticles, nanorods, and thinfilms has received intensive research attention. Thus, for the synthesis of β-Ga 2 O 3 nanoparticles, a number of liquid processes based on the sol-gel method, 8,12,19,24 hydrothermal synthesis, 14,25,26 solvothermal synthesis, 18,[27][28][29] sonochemical method, 30 and solution combustion 31 were proposed. In most cases, the liquid processes involve the preparation of intermediate products such as GaOOH and γ-Ga 2 O 3 nanoparticles, which are then converted to β-Ga 2 O 3 nanoparticles by calcination at a temperature of 700°C or higher in air.…”