Influence of synthesis procedure on the morphology of bismuth oxide particles (original) (raw)
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New synthesis of bismuth oxide nanoparticles Bi2O3 assisted by tannic acid
Applied Physics A, 2015
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.
Effects of surfactant on the morphology of α-Bi2O3 synthesized by the Sol-gel method
2020
Nano and micromaterial research, with a well-defined size and shape, has attracted attention from researchers in the areas of chemistry, physics, engineering and biomedicine, due to the wide range of possible applications such as: health, environment, catalysis and miniaturization of electronic devices. In this sense, the chemical routes of synthesis, such as Sol-Gel, are more prominent because it allows the production of particulate materials and thin films, with controllable size and morphology. In this work, bismuth oxide microparticles were synthesized by the Sol-Gel method using metallic bismuth (99.999% purity) in acid solution. Initially, bismuth was diluted with nitric acid solution and distilled water. After dilution, citric acid (600 mg) and ethylene glycol were added. The volume of ethylene glycol was varied from 1 to 3.75 mL, in order to study the morphological effects of its concentration. The samples were then subjected to the calcination process at 673 K for 12 hours....
Journal of Solid State Chemistry, 2007
We present the controlled solution-phase synthesis of several sheet-or rod-like bismuth oxides, BiOCl, Bi 12 O 17 Cl 2 , a-Bi 2 O 3 and (BiO) 2 CO 3 , by adjusting growth parameters such as reaction temperature, mole ratios of reactants, and the base used. BiOCl, Bi 12 O 17 Cl 2 , and a-Bi 2 O 3 could be prepared from BiCl 3 and NaOH, whereas (BiO) 2 CO 3 was prepared from BiCl 3 and urea. BiOCl and Bi 12 O 17 Cl 2 could also be prepared from BiCl 3 and ammonia. The a-Bi 2 O 3 sample exhibited strong emission at room temperature.
Journal of Solid State Chemistry, 2007
We present the controlled solution-phase synthesis of several sheet-or rod-like bismuth oxides, BiOCl, Bi 12 O 17 Cl 2 , a-Bi 2 O 3 and (BiO) 2 CO 3 , by adjusting growth parameters such as reaction temperature, mole ratios of reactants, and the base used. BiOCl, Bi 12 O 17 Cl 2 , and a-Bi 2 O 3 could be prepared from BiCl 3 and NaOH, whereas (BiO) 2 CO 3 was prepared from BiCl 3 and urea. BiOCl and Bi 12 O 17 Cl 2 could also be prepared from BiCl 3 and ammonia. The a-Bi 2 O 3 sample exhibited strong emission at room temperature.
Inorganic Chemistry, 2017
Two bismuth oxalates, namely, Bi 2 (C 2 O 4) 3 •7H 2 O and Bi(C 2 O 4)OH, were studied in terms of synthesis, structural characterization, particle morphology, and thermal behavior under several atmospheres. The oxalate powders were produced by chemical precipitation from bismuth nitrate and oxalic acid solutions under controlled pH, then characterized by X-ray diffraction (XRD), temperature-dependent XRD, IR spectroscopy, scanning electron microscopy, and thermogravimetric differential thermal analyses. New results on the thermal decomposition of bismuth oxalates under inert or reducing atmospheres are provided. On heating in nitrogen, both studied compounds decompose into small bismuth particles. Thermal properties of the metallic products were investigated. The Bi(C 2 O 4)OH decomposition leads to a Bi−Bi 2 O 3 metal−oxide composite product in which bismuth is confined in a nanometric size, due to surface oxidation. The melting point of such bismuth particles is strongly related to their crystallite size. The nanometric bismuth melting has thus been evidenced ∼40°C lower than for bulk bismuth. These results should contribute to the development of the oxalate precursor route for low-temperature soldering applications.
Evaluation of Atomic, Physical, and Thermal Properties of Bismuth Oxide Powder: An Impact of Biofield Energy Treatment, 2015
Bismuth oxide (Bi2O3) is known for its application in several industries such as solid oxide fuel cells, optoelectronics, gas sensors and optical coatings. The present study was designed to evaluate the effect of biofield energy treatment on the atomic, physical, and thermal properties of Bi2O3. The Bi2O3 powder was equally divided into two parts: control and treated. The treated part was subjected to biofield energy treatment. After that, both control and treated samples were investigated using X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared (FT-IR) spectroscopy, and electron spin resonance (ESR) spectroscopy. The XRD data exhibited that the biofield treatment has altered the lattice parameter (-0.19%), unit cell volume (-0.58%), density (0.59%), and molecular weight (-0.57%) of the treated sample as compared to the control. The crystallite size was significantly increased by 25% in treated sample as compared to the control. Furthermore, TGA analysis showed that control and treated samples were thermally stable upto tested temperature of 831°C. Besides, the FT-IR analysis did not show any significant change in absorption wavenumber in the treated sample as compared to the control. The ESR study revealed that g-factor was increased by 13.86% in the treated sample as compared to the control. Thus, above data suggested that biofield energy treatment has altered the atomic and physical properties of Bi2O3. Therefore, the biofield treated Bi2O3 could be more useful in solid oxide fuel cell industries.
Indonesian Journal of Chemistry, 2020
Research on synthesis of bismuth oxide (Bi2O3) using sol-gel method with varying calcination temperatures at 500, 600, and 700 °C has been done. This study aims to determine the effect of calcination temperature on the characteristics of the obtained products which encompasses crystal structure, surface morphology, band-gap energy, and photocatalytic activity for the decolorization of methyl orange dyes through its kinetic study. Bismuth oxide prepared by sol-gel method was undertaken by dissolving Bi(NO3)3·5H2O and citric acid in HNO3. The mixture was stirred then heated at 100 °C. The gel formed was dried in the oven and then calcined at 500, 600, and 700 °C for 5 h. The obtained products were a pale yellow powder, indicating the formation of bismuth oxide. This is confirmed by the existence of Bi–O and Bi–O–Bi functional groups through FTIR analysis. All three products possess the same mixed crystal structures of α-Bi2O3 (monoclinic) and γ-Bi2O3 (body center cubic), but their mor...
Room temperature chemical synthesis of Bi 2 O 3 nanoparticles
Micro & Nano Letters, 2021
In this article, room temperature synthesis of Bi 2 O 3 nanoparticles in a single-pot reaction is reported. The nanoparticles were synthesized by reducing Bi(NO 3) 3 ⋅5H 2 O with NaBH 4 as a reducing agent, SDS and oleic acid as stabilizing agents. The synthesized nanoparticles were characterized using UV-vis absorption spectroscopy, FTIR spectroscopy, XRD, and HR-TEM. The crystalline nature of the synthesized nanoparticles was confirmed through XRD and HRTEM data analysis. An average particle size of 14 nm (with quasispherical morphology) and a wide band gap were measured for the synthesized nanoparticles. HRTEM image confirmed a highly crystalline growth at individual nanoparticle level. Dielectric measurement indicates a rapid reduction of both real and imaginary dielectric constants as the frequency increases to higher values. The potential application of the synthesized nanoparticles has been demonstrated in photocatalytic degradation of pollutants present in the industrial waste-water. 1 This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Chemistry of Materials, 1996
A series of Bi 2 O 3-based oxides of general formula Bi 2-2x U x La x O (3+3x/2) (0.333 g x g 0.038) has been synthesized by two different methods. Materials were characterized by X-ray diffraction, chemical analysis, X-ray photoelectron spectroscopy, and thermal analysis. X-ray diffraction data show that they crystallize with cubic or hexagonal symmetry depending on composition and synthesis procedure. In particular, the stabilization of the fluorite-type structure as a single phase at room temperature has been achieved in the compositional range 0.154 g x g 0.091. The annealing of materials at 600°C for 500 h yields in all cases a "tetragonal" phase that is isolated as the only phase for x) 0.222. The evolution of this phase with temperature has been studied. Aged materials can be regenerated when they are subjected to the original synthesis conditions.
J Solid State Chem, 1998
WO 3 systems have been investigated using synchrotron X-ray diffraction (XRD) and electron diffraction (ED) to resolve outstanding problems concerning phase relationships, unit cells, and symmetry. A temperature-composition phase diagram for the Bi 2 O 3 -Nb 2 O 5 system is presented. Single-phase powder specimens have been prepared for most phases. A modulated structure approach has been applied to the characterization of phases, and space groups or superspace groups assigned. The most appropriate description (commensurate modulation, incommensurate modulation or superstructure) for the structure of each of the phases is discussed. 1998 Academic Press 42