Observation of Cotton-like Bismuth Oxide (β-Bi2O2.5) Prepared via Pulsed Laser Ablation Deposition

Monoclinic bismuth oxide (α-bi2o3) nanoparticles were prepared via precipitation method and irradiated with a pulsed laser forming thin films. their phase and surface morphological properties were investigated using x-ray diffraction (xrd), atomic force microscopy (afm), scanning electron microscopy (sem) and high resolution transmission electron microscopy (hr-tem). the xrd analysis shows the phase transformation to a partially crystalline tetragonal phase β-bi2o3 thin film. the sem micrograph of the nanoparticles, with an average crystal size of 72 nm, was seen to form a thin film with a peculiar structure, coined as “cotton-like”, is attributed to the high surface energy absorbed by the nanoparticles during ablation. the hr-tem micrograph shows the particulate with a clearly defined interlayer spacing.