Phase transition and electronic structure investigation of MoS2-reduced graphene oxide nanocomposite decorated with Au nanoparticles
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1088/1361-6528/ab3c91 http://hdl.handle.net/11449/199541 |
Resumo: | In this work a simple approach to transform MoS2 from its metallic (1T′ to semiconductor 2H) character via gold nanoparticle surface decoration of a MoS2 reduced graphene oxide (rGO) nanocomposite is proposed. The possible mechanism to this phase transformation was investigated using different spectroscopy techniques, and supported by density functional theory theoretical calculations. A mixture of the 1T′- and 2H-MoS2 phases was observed from the Raman and Mo 3d high resolution x-ray photoelectron spectra analysis in the MoS2-rGO nanocomposite. After surface decoration with gold nanoparticles the concentration of the 1T′ phase decreases making evident a phase transformation. According to Raman and valence band spectra analyzes, the Au nanoparticles (NPs) induce a p-type doping in MoS2-rGO nanocomposite. We proposed as a main mechanism to the MoS2 phase transformation the electron transfer from Mo 4dxy,xz,yz in 1T′ phase to AuNPs conduction band. At the same time, the unoccupied electronic structure was investigated from S K-edge near edge x-ray absorption fine structure spectroscopy. Finally, the electronic coupling between unoccupied electronic states was investigated by the core hole clock approach using resonant Auger spectroscopy, showing that AuNPs affect mainly the MoS2 electronic states close to Fermi level. |
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Repositório Institucional da UNESP |
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spelling |
Phase transition and electronic structure investigation of MoS2-reduced graphene oxide nanocomposite decorated with Au nanoparticlesIn this work a simple approach to transform MoS2 from its metallic (1T′ to semiconductor 2H) character via gold nanoparticle surface decoration of a MoS2 reduced graphene oxide (rGO) nanocomposite is proposed. The possible mechanism to this phase transformation was investigated using different spectroscopy techniques, and supported by density functional theory theoretical calculations. A mixture of the 1T′- and 2H-MoS2 phases was observed from the Raman and Mo 3d high resolution x-ray photoelectron spectra analysis in the MoS2-rGO nanocomposite. After surface decoration with gold nanoparticles the concentration of the 1T′ phase decreases making evident a phase transformation. According to Raman and valence band spectra analyzes, the Au nanoparticles (NPs) induce a p-type doping in MoS2-rGO nanocomposite. We proposed as a main mechanism to the MoS2 phase transformation the electron transfer from Mo 4dxy,xz,yz in 1T′ phase to AuNPs conduction band. At the same time, the unoccupied electronic structure was investigated from S K-edge near edge x-ray absorption fine structure spectroscopy. Finally, the electronic coupling between unoccupied electronic states was investigated by the core hole clock approach using resonant Auger spectroscopy, showing that AuNPs affect mainly the MoS2 electronic states close to Fermi level.Universidade Federal da Integracao Latino-Americana UNILAInorganic Chemistry Department Chemistry Institute Federal University of Rio de Janeiro (UFRJ)MackGraphe-Graphene and Nanomaterial Research Center Mackenzie Presbyterian UniversitySENAI Innovation Institute for Virtual Production SystemsBrazilian Synchrotron Light Laboratory (LNLS) Brazilian Center for Research in Energy and Materials (CNPEM)Departamento de Ciencias Universidad Privada Del Norte, Av. Andrés Belaunde Cdra. 10 s/n, ComasInstituto de Física Teórica State University of Sao Paulo (UNESP)Instituto de Física Teórica State University of Sao Paulo (UNESP)UNILAUniversidade Federal do Rio de Janeiro (UFRJ)Mackenzie Presbyterian UniversitySENAI Innovation Institute for Virtual Production SystemsBrazilian Center for Research in Energy and Materials (CNPEM)Universidad Privada Del NorteUniversidade Estadual Paulista (Unesp)Garcia-Basabe, YunierPeixoto, Gabriela F.Grasseschi, DanielRomani, Eric C.Vicentin, Flávio C.Villegas, Cesar E. P.Rocha, Alexandre R. [UNESP]Larrude, Dunieskys G.2020-12-12T01:42:45Z2020-12-12T01:42:45Z2019-09-09info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1088/1361-6528/ab3c91Nanotechnology, v. 30, n. 47, 2019.1361-65280957-4484http://hdl.handle.net/11449/19954110.1088/1361-6528/ab3c912-s2.0-85073830769Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengNanotechnologyinfo:eu-repo/semantics/openAccess2021-10-23T07:59:12Zoai:repositorio.unesp.br:11449/199541Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:06:22.224547Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Phase transition and electronic structure investigation of MoS2-reduced graphene oxide nanocomposite decorated with Au nanoparticles |
title |
Phase transition and electronic structure investigation of MoS2-reduced graphene oxide nanocomposite decorated with Au nanoparticles |
spellingShingle |
Phase transition and electronic structure investigation of MoS2-reduced graphene oxide nanocomposite decorated with Au nanoparticles Garcia-Basabe, Yunier |
title_short |
Phase transition and electronic structure investigation of MoS2-reduced graphene oxide nanocomposite decorated with Au nanoparticles |
title_full |
Phase transition and electronic structure investigation of MoS2-reduced graphene oxide nanocomposite decorated with Au nanoparticles |
title_fullStr |
Phase transition and electronic structure investigation of MoS2-reduced graphene oxide nanocomposite decorated with Au nanoparticles |
title_full_unstemmed |
Phase transition and electronic structure investigation of MoS2-reduced graphene oxide nanocomposite decorated with Au nanoparticles |
title_sort |
Phase transition and electronic structure investigation of MoS2-reduced graphene oxide nanocomposite decorated with Au nanoparticles |
author |
Garcia-Basabe, Yunier |
author_facet |
Garcia-Basabe, Yunier Peixoto, Gabriela F. Grasseschi, Daniel Romani, Eric C. Vicentin, Flávio C. Villegas, Cesar E. P. Rocha, Alexandre R. [UNESP] Larrude, Dunieskys G. |
author_role |
author |
author2 |
Peixoto, Gabriela F. Grasseschi, Daniel Romani, Eric C. Vicentin, Flávio C. Villegas, Cesar E. P. Rocha, Alexandre R. [UNESP] Larrude, Dunieskys G. |
author2_role |
author author author author author author author |
dc.contributor.none.fl_str_mv |
UNILA Universidade Federal do Rio de Janeiro (UFRJ) Mackenzie Presbyterian University SENAI Innovation Institute for Virtual Production Systems Brazilian Center for Research in Energy and Materials (CNPEM) Universidad Privada Del Norte Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Garcia-Basabe, Yunier Peixoto, Gabriela F. Grasseschi, Daniel Romani, Eric C. Vicentin, Flávio C. Villegas, Cesar E. P. Rocha, Alexandre R. [UNESP] Larrude, Dunieskys G. |
description |
In this work a simple approach to transform MoS2 from its metallic (1T′ to semiconductor 2H) character via gold nanoparticle surface decoration of a MoS2 reduced graphene oxide (rGO) nanocomposite is proposed. The possible mechanism to this phase transformation was investigated using different spectroscopy techniques, and supported by density functional theory theoretical calculations. A mixture of the 1T′- and 2H-MoS2 phases was observed from the Raman and Mo 3d high resolution x-ray photoelectron spectra analysis in the MoS2-rGO nanocomposite. After surface decoration with gold nanoparticles the concentration of the 1T′ phase decreases making evident a phase transformation. According to Raman and valence band spectra analyzes, the Au nanoparticles (NPs) induce a p-type doping in MoS2-rGO nanocomposite. We proposed as a main mechanism to the MoS2 phase transformation the electron transfer from Mo 4dxy,xz,yz in 1T′ phase to AuNPs conduction band. At the same time, the unoccupied electronic structure was investigated from S K-edge near edge x-ray absorption fine structure spectroscopy. Finally, the electronic coupling between unoccupied electronic states was investigated by the core hole clock approach using resonant Auger spectroscopy, showing that AuNPs affect mainly the MoS2 electronic states close to Fermi level. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-09-09 2020-12-12T01:42:45Z 2020-12-12T01:42:45Z |
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/10.1088/1361-6528/ab3c91 Nanotechnology, v. 30, n. 47, 2019. 1361-6528 0957-4484 http://hdl.handle.net/11449/199541 10.1088/1361-6528/ab3c91 2-s2.0-85073830769 |
url |
http://dx.doi.org/10.1088/1361-6528/ab3c91 http://hdl.handle.net/11449/199541 |
identifier_str_mv |
Nanotechnology, v. 30, n. 47, 2019. 1361-6528 0957-4484 10.1088/1361-6528/ab3c91 2-s2.0-85073830769 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Nanotechnology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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 |
|
_version_ |
1808128895561498624 |