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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...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Beilstein-Institut
2019
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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. |
format | Online Article Text |
id | pubmed-6664412 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Beilstein-Institut |
record_format | MEDLINE/PubMed |
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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