ZnWO4 nanocrystals: synthesis, morphology, photoluminescence and photocatalytic properties

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dc.contributor.author Pereira, P. F. S.
dc.contributor.author Gouveia, A. F.
dc.contributor.author Assis, M.
dc.contributor.author de Oliveira, R. C.
dc.contributor.author Pinatti, I. M.
dc.contributor.author Penha, M.
dc.contributor.author Goncalves, R. F.[UNIFESP]
dc.contributor.author Gracia, L.
dc.contributor.author Andres, J.
dc.contributor.author Longo, E.
dc.date.accessioned 2020-07-08T13:09:52Z
dc.date.available 2020-07-08T13:09:52Z
dc.date.issued 2018
dc.identifier http://dx.doi.org/10.1039/c7cp07354b
dc.identifier.citation Physical Chemistry Chemical Physics. Cambridge, v. 20, n. 3, p. 1923-1937, 2018.
dc.identifier.issn 1463-9076
dc.identifier.uri https://repositorio.unifesp.br/handle/11600/54257
dc.description.abstract The present joint experimental and theoretical work provides in-depth understanding on the morphology and structural, electronic, and optical properties of ZnWO4 nanocrystals. Monoclinic ZnWO4 nanocrystals were prepared at three different temperatures (140, 150, and 160 degrees C) by a microwave hydrothermal method. Then, the samples were investigated by X-ray diffraction with Rietveld refinement analysis, field-emission scanning electron microscopy, transmission electronic microscopy, micro-Raman and Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, and photoluminescence measurements. First-principles theoretical calculations within the framework of density functional theory were employed to provide information at the atomic level. The band structure diagram, density of states, Raman and infrared spectra were calculated to understand the effect of structural order-disorder on the properties of ZnWO4. The effects of the synthesis temperature on the above properties were rationalized. The band structure revealed direct allowed transitions between the VB and CB and the experimental results in the ultraviolet-visible region were consistent with the theoretical results. Moreover, the surface calculations allowed the association of the surface energy stabilization with the temperature used in the synthesis of the ZnWO4 nanocrystals. The photoluminescence properties of the ZnWO4 nanocrystals prepared at 140, 150, and 160 degrees C were attributed to oxygen vacancies in the [WO6] and [ZnO6] clusters, causing a red shift of the spectra. The ZnWO4 nanocrystals obtained at 160 degrees C exhibited excellent photodegradation of Rhodamine under ultraviolet light irradiation, which was found to be related to the surface energy and the types of clusters formed on the surface of the catalyst. en
dc.description.sponsorship Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
dc.description.sponsorship Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
dc.description.sponsorship Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior
dc.description.sponsorship GeneralitatValenciana
dc.description.sponsorship Ministerio de Economia y Competitividad (Spain)
dc.description.sponsorship Programa de Cooperacion Cientifica con Iberoamerica (Brasil) of Ministerio de Educacion
dc.description.sponsorship Ministerio de Economia y Competitividad, "Salvador Madariaga'' program
dc.format.extent 1923-1937
dc.language.iso eng
dc.publisher Royal Soc Chemistry
dc.relation.ispartof Physical Chemistry Chemical Physics
dc.rights Acesso restrito
dc.title ZnWO4 nanocrystals: synthesis, morphology, photoluminescence and photocatalytic properties en
dc.type Artigo
dc.description.affiliation Fed Univ Sao Carlos UFSCar, CDMF, LIEC, Chem Dept, POB 676, BR-13565905 Sao Carlos, SP, Brazil
dc.description.affiliation Fed Univ Sao Paulo UNIFESP, BR-09972270 Diadema, SP, Brazil
dc.description.affiliation Univ Valencia, Dept Phys Chem, E-46100 Burjassot, Spain
dc.description.affiliation UJI, Dept Analyt & Phys Chem, Castellon de La Plana 12071, Spain
dc.description.affiliationUnifesp Fed Univ Sao Paulo UNIFESP, BR-09972270 Diadema, SP, Brazil
dc.description.sponsorshipID FAPESP: 2012/14004-5, 2013/07296-2, 2013/26671-9, 2013/23995-8, 2014/14171-4, 2017/13008-0, 2017/07240-8
dc.description.sponsorshipID CNPq: 479644/2012-8, 350711/2012-7, 304531/2013-8, 151136/2013-0
dc.description.sponsorshipID GeneralitatValenciana: PrometeoII/2014/022, ACOMP/2014/270, ACOMP/2015/1202
dc.description.sponsorshipID Ministerio de Economia y Competitividad (Spain) : CTQ2015-65207-P
dc.description.sponsorshipID Programa de Cooperacion Cientifica con Iberoamerica (Brasil) of Ministerio de Educacion: PHBP14-00020]
dc.description.sponsorshipID Ministerio de Economia y Competitividad, "Salvador Madariaga'' program: PRX15/00261
dc.identifier.doi 10.1039/c7cp07354b
dc.description.source Web of Science
dc.identifier.wos WOS:000423019600061
dc.coverage Cambridge
dc.citation.volume 20
dc.citation.issue 3


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