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dc.contributor.authorLongo, Elson
dc.contributor.authorVolanti, Diogo P.
dc.contributor.authorLongo, V. M.
dc.contributor.authorGracia, Lourdes
dc.contributor.authorNogueira, Içamira C.
dc.contributor.authorAlmeida, M.A.P.
dc.contributor.authorPinheiro, Antonio N.
dc.contributor.authorFerrer, Mateus M.
dc.contributor.authorCavalcante, Laécio Santos
dc.contributor.authorAndres, Juan
dc.date.accessioned2014-03-06T13:47:30Z
dc.date.available2014-03-06T13:47:30Z
dc.date.issued2013
dc.identifier.issn1932-7447
dc.identifier.issn1932-7455
dc.identifier.urihttp://hdl.handle.net/10234/85730
dc.description.abstractA combined experimental and theoretical study was conducted on the structure and electronic properties of α-Ag2WO4 to clarify the nucleation and growth processes of Ag filaments on α-Ag2WO4 crystals induced by electron beam irradiation under electron microscopy. X-ray diffraction with Rietveld analysis, micro-Raman and Fourier-transform infrared spectroscopy were used to analyze the structural order/disorder of α-Ag2WO4 crystals. These complementary techniques indicated that the microwave-assisted hydrothermal method employed in the synthesis of α-Ag2WO4 crystals leads to the freezing of distorted [WO6] and [AgOy] (y = 2, 4, 6 and 7) clusters as the constituent polyhedra of α-Ag2WO4. On the basis of the theoretical and experimental results, we provide a complete assignment of the structure of α-Ag2WO4 and describe the relationship among the disorder, nucleation growth, rate of Ag formation, and photoluminescence behavior before and after the irradiation of the accelerated electron beam. Density functional theory (DFT) studies indicated significant changes in the order–disorder of the initial α-Ag2WO4electronic structure, with a decrease in the band gap value from 3.55 to 2.72 eV. The first stages of the electron irradiation on α-Ag2WO4 crystal were investigated by DFT calculations, and we have derived a mechanism to describe the formation and growth of Ag filaments during the electronic excitation of the [AgO2] cluster.ca_CA
dc.description.sponsorShipThis work is financially supported by the National Council for Scientific and Technological Development (CNPq), São Paulo Research Foundation (FAPESP), Prometeo/2009/053 (Generalitat Valenciana) and Ministerio de Economía y Competitividad (Spain), CTQ2012-36253-C03-02, and the Spanish–Brazilian program (PHB2009-0065-PC) for their financial support. TEM facilities were provided by LME-IQ-UNESP.ca_CA
dc.format.extent11 p.ca_CA
dc.language.isoengca_CA
dc.publisherAmerican Chemical Societyca_CA
dc.relation.isPartOfThe Journal of Physical Chemistry C (2013) vol. 118, no 2ca_CA
dc.rightsCopyright © 2013 American Chemical Societyca_CA
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/*
dc.subjectTransmission electron-microscopyca_CA
dc.subjectPhotocatalytic propertiesca_CA
dc.subjectCalcium molybdateca_CA
dc.subjectalpha-Ag2WO4ca_CA
dc.subjectGold nanoparticlesca_CA
dc.titleToward an Understanding of the Growth of Ag Filaments on α-Ag2WO4 and Their Photoluminescent Properties: A Combined Experimental and Theoretical Studyca_CA
dc.typeinfo:eu-repo/semantics/articleca_CA
dc.identifier.doihttp://dx.doi.org/10.1021/jp408167v
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessca_CA
dc.relation.publisherVersionhttp://pubs.acs.org/doi/full/10.1021/jp408167vca_CA
dc.type.versioninfo:eu-repo/semantics/acceptedVersionca_CA


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