In situ growth of Ag nanoparticles on α-Ag2WO4 under electron irradiation: Probing the physical principles
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1088/0957-4484/27/22/225703 http://hdl.handle.net/11449/177995 |
Resumo: | Exploiting the plasmonic behavior of Ag nanoparticles grown on α-Ag2WO4 is a widely employed strategy to produce efficient photocatalysts, ozone sensors, and bactericides. However, a description of the atomic and electronic structure of the semiconductor sites irradiated by electrons is still not available. Such a description is of great importance to understand the mechanisms underlying these physical processes and to improve the design of silver nanoparticles to enhance their activities. Motivated by this, we studied the growth of silver nanoparticles to investigate this novel class of phenomena using both transmission electron microscopy and field emission scanning electron microscopy. A theoretical framework based on density functional theory calculations (DFT), together with experimental analysis and measurements, were developed to examine the changes in the local geometrical and electronic structure of the materials. The physical principles for the formation of Ag nanoparticles on α-Ag2WO4 by electron beam irradiation are described. Quantum mechanical calculations based on DFT show that the (001) of α-Ag2WO4 displays Ag atoms with different coordination numbers. Some of them are able to diffuse out of the surface with a very low energy barrier (less than 0.1 eV), thus, initiating the growth of metallic Ag nanostructures and leaving Ag vacancies in the bulk material. These processes increase the structural disorder of α-Ag2WO4 as well as its electrical resistance as observed in the experimental measurements. |
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In situ growth of Ag nanoparticles on α-Ag2WO4 under electron irradiation: Probing the physical principlesAg nanoparticlesdensity functional theoryplasmonic effecttransmission electron microscopyα-Ag2WO4Exploiting the plasmonic behavior of Ag nanoparticles grown on α-Ag2WO4 is a widely employed strategy to produce efficient photocatalysts, ozone sensors, and bactericides. However, a description of the atomic and electronic structure of the semiconductor sites irradiated by electrons is still not available. Such a description is of great importance to understand the mechanisms underlying these physical processes and to improve the design of silver nanoparticles to enhance their activities. Motivated by this, we studied the growth of silver nanoparticles to investigate this novel class of phenomena using both transmission electron microscopy and field emission scanning electron microscopy. A theoretical framework based on density functional theory calculations (DFT), together with experimental analysis and measurements, were developed to examine the changes in the local geometrical and electronic structure of the materials. The physical principles for the formation of Ag nanoparticles on α-Ag2WO4 by electron beam irradiation are described. Quantum mechanical calculations based on DFT show that the (001) of α-Ag2WO4 displays Ag atoms with different coordination numbers. Some of them are able to diffuse out of the surface with a very low energy barrier (less than 0.1 eV), thus, initiating the growth of metallic Ag nanostructures and leaving Ag vacancies in the bulk material. These processes increase the structural disorder of α-Ag2WO4 as well as its electrical resistance as observed in the experimental measurements.Institute of Chemistry State University of Campinas - UnicampInstitute of Physics 'Gleb Wataghin' State University of Campinas - UnicampInstitute of Chemistry UNESP (Universidade Estadual Paulista)Chemistry Department Federal University of Sao Carlos - UFSCarDepartament de Quĩmica Fĩsica i Analĩtica Universitat Jaume iCDMF-UNESP Universidade Estadual Paulista, PO Box 355Institute of Chemistry UNESP (Universidade Estadual Paulista)CDMF-UNESP Universidade Estadual Paulista, PO Box 355Universidade Estadual de Campinas (UNICAMP)Universidade Estadual Paulista (Unesp)Universidade Federal de São Carlos (UFSCar)Universitat Jaume iSan-Miguel, Miguel ADa Silva, Edison ZZanetti, Sonia M [UNESP]Cilense, Mario [UNESP]Fabbro, Maria TGracia, LourdesAndrés, JuanLongo, Elson [UNESP]2018-12-11T17:28:05Z2018-12-11T17:28:05Z2016-04-26info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://dx.doi.org/10.1088/0957-4484/27/22/225703Nanotechnology, v. 27, n. 22, 2016.1361-65280957-4484http://hdl.handle.net/11449/17799510.1088/0957-4484/27/22/2257032-s2.0-849650070052-s2.0-84965007005.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengNanotechnology1,0791,079info:eu-repo/semantics/openAccess2024-01-02T06:15:51Zoai:repositorio.unesp.br:11449/177995Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:53:52.164173Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
In situ growth of Ag nanoparticles on α-Ag2WO4 under electron irradiation: Probing the physical principles |
title |
In situ growth of Ag nanoparticles on α-Ag2WO4 under electron irradiation: Probing the physical principles |
spellingShingle |
In situ growth of Ag nanoparticles on α-Ag2WO4 under electron irradiation: Probing the physical principles San-Miguel, Miguel A Ag nanoparticles density functional theory plasmonic effect transmission electron microscopy α-Ag2WO4 |
title_short |
In situ growth of Ag nanoparticles on α-Ag2WO4 under electron irradiation: Probing the physical principles |
title_full |
In situ growth of Ag nanoparticles on α-Ag2WO4 under electron irradiation: Probing the physical principles |
title_fullStr |
In situ growth of Ag nanoparticles on α-Ag2WO4 under electron irradiation: Probing the physical principles |
title_full_unstemmed |
In situ growth of Ag nanoparticles on α-Ag2WO4 under electron irradiation: Probing the physical principles |
title_sort |
In situ growth of Ag nanoparticles on α-Ag2WO4 under electron irradiation: Probing the physical principles |
author |
San-Miguel, Miguel A |
author_facet |
San-Miguel, Miguel A Da Silva, Edison Z Zanetti, Sonia M [UNESP] Cilense, Mario [UNESP] Fabbro, Maria T Gracia, Lourdes Andrés, Juan Longo, Elson [UNESP] |
author_role |
author |
author2 |
Da Silva, Edison Z Zanetti, Sonia M [UNESP] Cilense, Mario [UNESP] Fabbro, Maria T Gracia, Lourdes Andrés, Juan Longo, Elson [UNESP] |
author2_role |
author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual de Campinas (UNICAMP) Universidade Estadual Paulista (Unesp) Universidade Federal de São Carlos (UFSCar) Universitat Jaume i |
dc.contributor.author.fl_str_mv |
San-Miguel, Miguel A Da Silva, Edison Z Zanetti, Sonia M [UNESP] Cilense, Mario [UNESP] Fabbro, Maria T Gracia, Lourdes Andrés, Juan Longo, Elson [UNESP] |
dc.subject.por.fl_str_mv |
Ag nanoparticles density functional theory plasmonic effect transmission electron microscopy α-Ag2WO4 |
topic |
Ag nanoparticles density functional theory plasmonic effect transmission electron microscopy α-Ag2WO4 |
description |
Exploiting the plasmonic behavior of Ag nanoparticles grown on α-Ag2WO4 is a widely employed strategy to produce efficient photocatalysts, ozone sensors, and bactericides. However, a description of the atomic and electronic structure of the semiconductor sites irradiated by electrons is still not available. Such a description is of great importance to understand the mechanisms underlying these physical processes and to improve the design of silver nanoparticles to enhance their activities. Motivated by this, we studied the growth of silver nanoparticles to investigate this novel class of phenomena using both transmission electron microscopy and field emission scanning electron microscopy. A theoretical framework based on density functional theory calculations (DFT), together with experimental analysis and measurements, were developed to examine the changes in the local geometrical and electronic structure of the materials. The physical principles for the formation of Ag nanoparticles on α-Ag2WO4 by electron beam irradiation are described. Quantum mechanical calculations based on DFT show that the (001) of α-Ag2WO4 displays Ag atoms with different coordination numbers. Some of them are able to diffuse out of the surface with a very low energy barrier (less than 0.1 eV), thus, initiating the growth of metallic Ag nanostructures and leaving Ag vacancies in the bulk material. These processes increase the structural disorder of α-Ag2WO4 as well as its electrical resistance as observed in the experimental measurements. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-04-26 2018-12-11T17:28:05Z 2018-12-11T17:28:05Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1088/0957-4484/27/22/225703 Nanotechnology, v. 27, n. 22, 2016. 1361-6528 0957-4484 http://hdl.handle.net/11449/177995 10.1088/0957-4484/27/22/225703 2-s2.0-84965007005 2-s2.0-84965007005.pdf |
url |
http://dx.doi.org/10.1088/0957-4484/27/22/225703 http://hdl.handle.net/11449/177995 |
identifier_str_mv |
Nanotechnology, v. 27, n. 22, 2016. 1361-6528 0957-4484 10.1088/0957-4484/27/22/225703 2-s2.0-84965007005 2-s2.0-84965007005.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Nanotechnology 1,079 1,079 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1808129371097006080 |