Structural and Enhanced Optical Properties of Stabilized γ‒Bi2O3 Nanoparticles: Effect of Oxygen Ion Vacancies

摘要

We report the synthesis of room temperature (RT) stabilized γ–Bi O nanoparticles (NPs) at the expense of metallic Bi NPs through annealing in an ambient atmosphere. RT stability of the metastable γ–Bi O NPs is confirmed using synchrotron radiation powder X-ray diffraction and Raman spectroscopy. γ–Bi O NPs exhibited a strong red-band emission peaking at ~701 nm, covering 81% integrated intensity of photoluminescence spectra. Our findings suggest that the RT stabilization and enhanced red-band emission of γ‒Bi O is mediated by excess oxygen ion vacancies generated at the octahedral O(2) sites during the annealing process.