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Ermakova, L. V.; Strekalovskii, V.N.; Вовкотруб, Э. Г.; Бамбуров, В. Г.

doi:10.1023/a:1015396716886

Cited by 13 publications

(2 citation statements)

References 3 publications

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“…The peaks at [126, and 313] cm -1 are the characteristic of Bi-O stretches [33,40]. Now, the peak at 602 cm -1 could be related to the O-Bi-O bond, because as was mentioned by Ermakova [41], in the d-Bi 2 O 3 phase (fluorite type structure), there is a vibration around the 620 cm -1 related to the active photon T 2g , which is caused by the symmetrical oscillation between O-M-O (oxygenmetal-oxygen) and the width of the peak referred to the intrinsic disorder of the structure. The peaks that were detected at frequencies above 1000 cm -1 , which were found in the frequencies [1066, 1349, and 1558] cm -1 , are related to the precursor agents (tannic acid), since in particular the peaks [1558 and 1349] cm -1 are related to vibrations of compounds containing carbon.…”

Section: Resultsmentioning

confidence: 83%

New synthesis of bismuth oxide nanoparticles Bi2O3 assisted by tannic acid

Aguirre

Becerra

2015

Appl. Phys. A

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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.

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Section: Resultsmentioning

confidence: 83%

New synthesis of bismuth oxide nanoparticles Bi2O3 assisted by tannic acid

Aguirre

Becerra

2015

Appl. Phys. A

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“…The presence of this Raman active mode can be expected for δ-Bi 2 O 3 due to its defective fluorite structure. At present, the reported Raman spectra for the δ-Bi 2 O 3 phase are characterized by an asymmetric band, with a Raman shift that varies in the interval from 580 to 650 cm −1 depending on the preparation conditions [31]. For example, Bandyopadhyay et al reported that the asymmetric band consisted of two peaks located at 540 and 620 cm −1 .…”

Section: Oxidation Process Of Bi Npsmentioning

confidence: 99%

Study of the oxidation process of bismuth nanoparticles using NaClO

et al. 2023

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Bismuth nanoparticles (NPs) colloids synthesized in deionized water by laser ablation of solids in liquids technique (LASL) were oxidized using NaClO solutions at different concentrations. Oxidized nanomaterials were characterized using several techniques. The crystalline phases of the bismuth compound were determined using Raman microspectroscopy, and the crystallographic structure was identified by X-ray diffraction (XRD). The size and morphology of the obtained nanomaterials were studied by transmission electron microscopy (TEM). The chemical states were determined using X-ray Photoelectron Spectroscopy (XPS), and the optical properties of the colloids were characterized by UV-Vis spectroscopy. The absorption spectra were analyzed using the Tauc method to determine the band gaps of the obtained nanomaterials. Our results showed morphological changes, starting from small nanoparticles to nanosheets and a mixture of nanosheets with hollow nanoparticles. Three kinds of nanomaterials were found depending on the NaClO solution concentration: Bi2O2CO3, δ-Bi2O3, or a mixture of both. Some samples were tested as photocatalysts and showed good performance in the degradation of methylene blue in solution. To the best of our knowledge, this is the first study on the oxidation process of bismuth colloidal nanoparticles at room temperature.

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Synthesis and Optical Properties of Different Bismuth Niobate Films Grown by Dual Magnetron Co‐Sputtering

Depablos-Rivera

Zeinert

Rodil³

2018

Adv Eng Mater

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The interest about the synthesis of bismuth niobates (BNOs) in a thin‐film form has recently grown since their optical and electrical properties are attractive for applications such as photocatalysis, sensors, and fuel cells. The aim of this work is to demonstrate the successful synthesis of different BNOs as films using dual confocal magnetron co‐sputtering deposition, and evaluate properly their optical properties. Two independent targets of α‐Bi2O3 and Nb are used. Crystalline as‐deposited films are obtained at Nb contents ≤9.2 at%. Meanwhile, films grow amorphous for Nb contents >9.2 at%. However, amorphous films are crystallized after annealing obtaining BNOs in compliance with the as‐grown composition. There is a good reproducibility and correlation between the films structure and composition that is controlled through the variation of the power applied to the Nb target. The following niobates are obtained: solid solutions with 5.1–6.6 at% Nb and II‐Bi3NbO7, Bi5Nb3O15, and the mixture of α‐BiNbO4(76 wt%) + β‐BiNbO4(24 wt%). The optical properties of the BNOs are estimated from the data measured by UV‐Visible‐NIR transmittance and reflectance spectrometry. It is shown that all the films have refractive indexes n>2 and optical gaps between 1.67 and 3.34 eV, depending on the Nb content and phase.

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Untitled

Cited by 13 publications

References 3 publications

New synthesis of bismuth oxide nanoparticles Bi2O3 assisted by tannic acid

New synthesis of bismuth oxide nanoparticles Bi2O3 assisted by tannic acid

Study of the oxidation process of bismuth nanoparticles using NaClO

Synthesis and Optical Properties of Different Bismuth Niobate Films Grown by Dual Magnetron Co‐Sputtering

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