Optical properties of bismuth trioxide thin films

Fabrication and photocatalytic property of α-Bi2O3 nanoparticles by femtosecond laser ablation in liquid

“…Over the past decade, a new photocatalyst bismuth oxide attracted increasing attention of their promising candidate for the visible light-activated photocatalyst due to their following advantages: (i) Bi 2 O 3 with band gaps varying from 2 to 3.96 eV has optical absorption in the visible region [1][2][3]. (ii) Its intrinsic polarizabilities are favorable for the separation of photo-generated electron-hole pairs and the transfer of these charge carriers [4].…”

Laser irradiation-induced α to δ phase transformation in Bi2O3 ceramics and nanowires

“…Bismuth trioxide (Bi 2 O 3 ) is a semiconductor with interesting physical properties, such as a wide optical band-gap, high refractive index and dielectric permittivity, good photoconductive response, and ionic conductivity, which make this material suitable for applications in solid oxide fuel cells, gas sensing, optical coatings, catalysis, and optoelectronics. [1][2][3] phase is one of the best oxygen ion conductors known (r $ 1.5 S cm À1 ) and is considered as a reference material within the field of solid electrolytes. 6 This phase can be stabilized by addition of rare earth oxides, but the conductivity drops by about two orders of magnitude.…”

Synthesis, surface tension, optical and dielectric properties of bismuth oxide thin film

“…The straight-line was extrapolated to the energy axis at α = 0, to obtain the band gap value of the film which was found to be 3.77 eV. The band gaps of nanometric (up to ∼60 nm) and the submicronic films (d ∼ 0.15 µm) were determined by Leontie et al [8] as 2.5 eV and 3.3 eV, respectively. They found that the grain size is inversely proportional to the optical band gap and that the film thickness affects the optical band gap.…”

“…Until now, five polymorphic forms of bismuth oxides were obtained: two stable polymorphs, namely α and δ phases (α-Bi 2 O 3 is monoclinic, δ-Bi 2 O 3 is face-centered cubic), and three metastable phases, i.e. β, γ and ω (β-Bi 2 O 3 is tetragonal, γ-Bi 2 O 3 is body-centered cubic, ω-Bi 2 O 3 is triclinic) [5][6][7][8][9][10][11][12][13]35]. For nanometric thicknesses, BiO is predominant phase, while in case of micronic films, α-Bi 2 O 3 and Bi 2 O 3 are the main phase components [11].…”