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Direct observation of oxygen-vacancy formation and structural changes in Bi(2)WO(6) nanoflakes induced by electron irradiation

The prominent role of oxygen vacancies in the photocatalytic performance of bismuth tungsten oxides is well recognized, while the underlying formation mechanisms remain poorly understood. Here, we use the transmission electron microscopy to investigate the formation of oxygen vacancies and the struc...

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Autores principales: Shi, Hong-long, Zou, Bin, Li, Zi-an, Luo, Min-ting, Wang, Wen-zhong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Beilstein-Institut 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6664412/
https://www.ncbi.nlm.nih.gov/pubmed/31431855
http://dx.doi.org/10.3762/bjnano.10.141
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author Shi, Hong-long
Zou, Bin
Li, Zi-an
Luo, Min-ting
Wang, Wen-zhong
author_facet Shi, Hong-long
Zou, Bin
Li, Zi-an
Luo, Min-ting
Wang, Wen-zhong
author_sort Shi, Hong-long
collection PubMed
description The prominent role of oxygen vacancies in the photocatalytic performance of bismuth tungsten oxides is well recognized, while the underlying formation mechanisms remain poorly understood. Here, we use the transmission electron microscopy to investigate the formation of oxygen vacancies and the structural evolution of Bi(2)WO(6) under in situ electron irradiation. Our experimental results reveal that under 200 keV electron irradiation, the breaking of relatively weak Bi–O bonds leads to the formation of oxygen vacancies in Bi(2)WO(6). With prolonged electron irradiation, the reduced Bi cations tend to form Bi clusters on the nanoflake surfaces, and the oxygen atoms are released from the nanoflakes, while the W–O networks reconstruct to form WO(3). A possible mechanism that accounts for the observed processes of Bi cluster formation and oxygen release under energetic electron irradiation is also discussed.
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spelling pubmed-66644122019-08-20 Direct observation of oxygen-vacancy formation and structural changes in Bi(2)WO(6) nanoflakes induced by electron irradiation Shi, Hong-long Zou, Bin Li, Zi-an Luo, Min-ting Wang, Wen-zhong Beilstein J Nanotechnol Full Research Paper The prominent role of oxygen vacancies in the photocatalytic performance of bismuth tungsten oxides is well recognized, while the underlying formation mechanisms remain poorly understood. Here, we use the transmission electron microscopy to investigate the formation of oxygen vacancies and the structural evolution of Bi(2)WO(6) under in situ electron irradiation. Our experimental results reveal that under 200 keV electron irradiation, the breaking of relatively weak Bi–O bonds leads to the formation of oxygen vacancies in Bi(2)WO(6). With prolonged electron irradiation, the reduced Bi cations tend to form Bi clusters on the nanoflake surfaces, and the oxygen atoms are released from the nanoflakes, while the W–O networks reconstruct to form WO(3). A possible mechanism that accounts for the observed processes of Bi cluster formation and oxygen release under energetic electron irradiation is also discussed. Beilstein-Institut 2019-07-18 /pmc/articles/PMC6664412/ /pubmed/31431855 http://dx.doi.org/10.3762/bjnano.10.141 Text en Copyright © 2019, Shi et al. https://creativecommons.org/licenses/by/4.0https://www.beilstein-journals.org/bjnano/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0). Please note that the reuse, redistribution and reproduction in particular requires that the authors and source are credited. The license is subject to the Beilstein Journal of Nanotechnology terms and conditions: (https://www.beilstein-journals.org/bjnano/terms)
spellingShingle Full Research Paper
Shi, Hong-long
Zou, Bin
Li, Zi-an
Luo, Min-ting
Wang, Wen-zhong
Direct observation of oxygen-vacancy formation and structural changes in Bi(2)WO(6) nanoflakes induced by electron irradiation
title Direct observation of oxygen-vacancy formation and structural changes in Bi(2)WO(6) nanoflakes induced by electron irradiation
title_full Direct observation of oxygen-vacancy formation and structural changes in Bi(2)WO(6) nanoflakes induced by electron irradiation
title_fullStr Direct observation of oxygen-vacancy formation and structural changes in Bi(2)WO(6) nanoflakes induced by electron irradiation
title_full_unstemmed Direct observation of oxygen-vacancy formation and structural changes in Bi(2)WO(6) nanoflakes induced by electron irradiation
title_short Direct observation of oxygen-vacancy formation and structural changes in Bi(2)WO(6) nanoflakes induced by electron irradiation
title_sort direct observation of oxygen-vacancy formation and structural changes in bi(2)wo(6) nanoflakes induced by electron irradiation
topic Full Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6664412/
https://www.ncbi.nlm.nih.gov/pubmed/31431855
http://dx.doi.org/10.3762/bjnano.10.141
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