Phase transition and electronic structure investigation of MoS2-reduced graphene oxide nanocomposite decorated with Au nanoparticles

Página do item simplificado
dc.contributor.authorGarcia-Basabe Y.
dc.contributor.authorPeixoto G.F.
dc.contributor.authorGrasseschi D.
dc.contributor.authorRomani E.C.
dc.contributor.authorVicentin F.C.
dc.contributor.authorVillegas C.E.P.
dc.contributor.authorRocha A.R.
dc.contributor.authorLarrude D.G.
dc.date.accessioned2024-03-12T23:51:53Z
dc.date.available2024-03-12T23:51:53Z
dc.date.issued2019
dc.description.abstract© 2019 IOP Publishing Ltd.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.
dc.description.issuenumber47
dc.description.volume30
dc.identifier.doi10.1088/1361-6528/ab3c91
dc.identifier.issn1361-6528
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/35199
dc.relation.ispartofNanotechnology
dc.rightsAcesso Restrito
dc.titlePhase transition and electronic structure investigation of MoS2-reduced graphene oxide nanocomposite decorated with Au nanoparticles
dc.typeArtigo
local.scopus.citations23
local.scopus.eid2-s2.0-85073830769
local.scopus.subjectElectronic coupling
local.scopus.subjectReduced graphene oxides
local.scopus.subjectReduced graphene oxides (RGO)
local.scopus.subjectResonant Auger spectroscopy
local.scopus.subjectTheoretical calculations
local.scopus.subjectUnoccupied electronic state
local.scopus.subjectValence band spectra
local.scopus.subjectX ray photoelectron spectra
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85073830769&origin=inward
Arquivos
Coleções
Artigos de periódico