New synthesis of bismuth oxide nanoparticles Bi2O3 assisted by tannic acid

Abstract

A new and simple method of biosynthesis assisted by tannic acid (C 76 H 52 O 46 ) is used to obtain bismuth trioxide nanoparticles Bi 2 O 3 in which the b-Bi 2 O 3 phase is identified. Synthesis takes place at room temperature and atmospheric pressure from the reduction of bismuth nitrate pentahydrate (Bi(NO 3 ) 3 Á5H 2 O) in solution, using tannic acid as a reducing agent and stabilizer. Nanoparticles with an average size of 10.99 ± 0.27 nm are obtained, and the structural properties of the nanoparticles are observed using transmission electron microscopy techniques, as well as UV-Visible-NIR spectroscopy, with which a semiconductor behavior with band gap within a range of (2.57-3.02) eV is observed. Using Raman spectroscopy, it is possible to observe and identify different normal modes of vibration, characteristic of the b-Bi 2 O 3 phase.

Mechanosynthesis of Nanocrystalline Fully Stabilized bcc γ-phase of Bi2O3 without Any Additive: Manifestation of Ferroelasticity in Microstructure, Optical, and Transport Properties

“…Variation of band gaps with crystallite size as well as milling time is depicted in Figure c. It indicates that band gap increases with the increase of milling time up to 18 h, i.e., with decrease of crystallite size, which may be due to the reduction of the thickness of valence and conduction bands resulting from a lower number of atoms available in these bands . However, after 20 h of milling, the band gap decreases substantially and almost reverts to the band gap of the 15 h milled compound.…”

“…The peaks at 94, 117, 156, 185, 211, 278, 311, and 450 cm –1 correspond to the characteristic peaks of monoclinic α-phase which appears due to the stretching vibration of Bi atom within BiO 6 octahedra. , The other two peaks at 256 and 529 cm –1 are the characteristic peaks of the γ-phase of Bi 2 O 3 , which may also appear due to the stretching vibration of the Bi–O unit inside the BiO 5 matrix. The peaks at 138 and 426 cm –1 are the characteristic signature of the β-phase of Bi 2 O 3 . , The deconvolution process has been employed to calculate the area precisely under each peak, and from the relative phase abundances, the contribution of the α-phase is found to be dominant (∼76%). Thus, the existence of multiple phases in the 20 h milled sample with their quantitative measures is corroborated well with the results obtained from Rietveld refinement.…”

Nano Phase Characterization by Transmission Electron Microscopy: Experimental and Simulation

“…In order to prepare our samples, we use a small variation of the method of synthesis previously published [12]. In this method where used tannic acid (C 76 H 52 O 46 ) and bismuth nitrate pentahydrate Bi(NO 3 ) 3* 5H 2 O, the pH value was changed with NaOH and stabilized in pH = 11 in order to obtain a more alkaline environment in the synthesis to continue the process of lyophilization [13].…”

Synergistic effect of β-Bi2O3 and graphene/MWCNT in silicone-based polymeric matrices on diagnostic X-ray attenuation

“…Bismuth, a naturally occurring heavy element next to lead in the periodic table, is studied in combination with polymer matrix as nanocomposites. The oxide form of Bi, i.e., Bi 2 O 3 , is polymorphic in nature and exists as α-Bi 2 O 3, β-Bi 2 O 3, γ-Bi 2 O 3, δ-Bi 2 O 3 , ε-Bi 2 O 3 and ω-Bi 2 O 3 and hexagonal phase (Aguirre and Becerra 2015). Recent research on non-leadbased materials largely focuses on bismuth trioxide due to its biocompatibility (Aguirre and Becerra 2015;Maghrabi et al 2016a;Nambiar et al 2013;Seabra and Duran 2015;Stewart et al 2016).…”

“…The oxide form of Bi, i.e., Bi 2 O 3 , is polymorphic in nature and exists as α-Bi 2 O 3, β-Bi 2 O 3, γ-Bi 2 O 3, δ-Bi 2 O 3 , ε-Bi 2 O 3 and ω-Bi 2 O 3 and hexagonal phase (Aguirre and Becerra 2015). Recent research on non-leadbased materials largely focuses on bismuth trioxide due to its biocompatibility (Aguirre and Becerra 2015;Maghrabi et al 2016a;Nambiar et al 2013;Seabra and Duran 2015;Stewart et al 2016). The superior X-ray attenuation property of β-Bi 2 O 3 nanoparticles than that of α-Bi 2 O 3 and Bi nanoparticles is already shown in our previous study (Jayakumar et al 2018).…”