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

Abstract

We report the synthesis of room temperature (RT) stabilized γ–Bi2O3 nanoparticles (NPs) at the expense of metallic Bi NPs through annealing in an ambient atmosphere. RT stability of the metastable γ–Bi2O3 NPs is confirmed using synchrotron radiation powder X-ray diffraction and Raman spectroscopy. γ–Bi2O3 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‒Bi2O3 is mediated by excess oxygen ion vacancies generated at the octahedral O(2) sites during the annealing process.

Tuning the heterophase junction in Bi2O3 hybrid crystals with enhanced photocatalytic activity

“…6(d). The higher Bi/O atomic ratio of approximately 0.87 suggests a similar value in γ-Bi 2 O 3 reported by Gandhi et al 35 Given the detective limitation, elemental mapping is investigated by picking up the smaller tetrahedron crystal from the same TEM grid specimen. As shown in Fig.…”

Fuel‐dependent, shape‐selective, distinct blue and green photoluminescence from α‐Bi2O3 and β‐Bi2O3 synthesised using microwave combustion

“…Various methods for the synthesis of α-Bi 2 O 3 and β-Bi 2 O 3 have been reported in literature. These include direct precipitation [13][14][15][16][17], solution combustion [5,6,18,19], sol-gel synthesis [20][21][22][23], solvothermal calcination [8], chemical vapour decomposition [24,25], physical vapour deposition [26], microbial synthesis [27], flame spray pyrolysis [28], sonochemical synthesis [29][30][31], thermal synthesis [12], magnetron sputtering deposition [32], electrochemical synthesis [10,33] and solution microwave synthesis [34,35]. Most of these methods use strong acids and intensive processing conditions, making Aamir Bashir and Sriraj S. Mestry have contributed equally to this study.…”

Multiferroic behavior of the functionalized surface of a flexible substrate by deposition of Bi2O3 and Fe2O3

“…Phases Fe 3 O 4 and Bi 2 O 3 are also formed on the sample surface. This is a more favorable combination for the subsequent formation of the bismuth ferrite phase, taking O 3 (triclinic) (Gandhi et al, 2020b;Gandhi, Cheng, & Wu, 2020a;Liu et al, 2016).…”

“…Bismuth oxide exists in several polymorphs. They are α‐Bi 2 O 3 (monoclinic), β‐Bi 2 O 3 (tetragonal), γ‐Bi 2 O 3 (bcc), δ‐Bi 2 O 3 (cubic), and ε‐Bi 2 O 3 (triclinic) (Gandhi et al, 2020b; Gandhi, Cheng, & Wu, 2020a; Liu et al, 2016).…”