Synthesis, Preparation, Structural, Optical, Morphological and Elemental Analysis of Bismuth Oxides Nanoparticles

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

“…It has been suggested that both the quantum size effect and the structural defects in the crystals are the two main reasons for luminescence in Bi 2 O 3 . The peaks observed between 2.69 and 2.55 eV are attributed to charge transfer between Bi 3+ ion clusters bonded with oxygen ([BiO 6 − ]–[BiO 6 − ] cluster) [51], and the peak at 3.03 ± 0.02 eV may be the recombination from the conduction band to energy levels of a deep trap or a surface state [52]. The peak at 2.61 ± 0.05 eV is due to the near‐band‐edge emission from Bi 2 O 3 [53].…”

“…Figure 7 shows the PL spectra of the synthesised Bi ] cluster) [51], and the peak at 3.03 ± 0.02 eV may be the recombination from the conduction band to energy levels of a deep trap or a surface state [52]. The peak at 2.61 ± 0.05 eV is due to the near-band-edge emission from Bi 2 O 3 [53].…”

“…The transition 3 P 1 -1 S 0 is more probable, as observed earlier, however, more so as the energy difference between the levels 3 P 1 and 3 P 0 is small and the level 3 P 0 'energises' the emission level 3 P 1 . It was observed that the transition between the levels 3 P 1 and 3 P 0 in a number of bismuth-containing compounds leads to a green luminescence [48,52,54]. Therefore, the peak in the green range of 2.32 ± 0.02 eV can be attributed to surface defects or trace impurity trap associated with oxygen vacancies interacting with interfacial bismuth vacancies that are present in the sample and the 3 P 1 and 3 P 0 transition [54].…”

The application of membrane sequencing batch reactors in high rate activated sludge processes: the effect of the organic loading rate on the bioflocculation and fouling phenomenon

“…71 The weak bands at 2931 cm −1 and 2385 cm −1 are caused by C-H stretching. 72,73 The broad peak at 3369 cm −1 corresponds to the hydroxyl group in polysaccharides. 19…”

Bismuth Oxide Prepared by Sol-Gel Method: Variation of Physicochemical Characteristics and Photocatalytic Activity Due to Difference in Calcination Temperature

“…show the respective bismuth oxide FTIR spectra of SG500, SG600 and SG700. FTIR spectra show absorbances at around 848, 850, and 834 cm -1 indicating the symmetrical stretching of Bi-O-Bi bonds [23][24][25]. In addition, the wavenumber 1394 cm -1 points to the stretching vibration of the Bi-O bond [25].…”