This study examined the preparation of monoclinic beta-Ga2O3 hollow nanostructures with various firing temperatures ranging from 500 to 900 degrees C by using hydrothermal and calcination processes. The X-ray diffraction patterns indicate that beta-Ga2O3 hollow nanostructures were synthesized at temperatures over 600 degrees C. The Ga(OH)CO3 components of the shell were confirmed by Fourier transform infrared spectrometry. An investigation with field-emission scanning electron microscopy indicated a white body color of beta-Ga2O3 hollow nanostructures at 800 degrees C with diameters of about 200 nm. However, the sample calcined at 500 degrees C showed brown body color and was not perfectly crystallized. The cathodoluminescence spectrum revealed blue emission at 300-500 nm, which was assigned to vacancies in beta-Ga2O3 hollow nanostructures.

Keywords: Semiconductors; beta-Ga2O3; Hollow nanostructures; FTIR