ZnWO4 nanocrystals: synthesis, morphology, photoluminescence and photocatalytic properties

ZnWO4 nanocrystals: synthesis, morphology, photoluminescence and photocatalytic properties

Author Pereira, P. F. S. Google Scholar
Gouveia, A. F. Google Scholar
Assis, M. Google Scholar
de Oliveira, R. C. Google Scholar
Pinatti, I. M. Google Scholar
Penha, M. Google Scholar
Autor UNIFESP Google Scholar
Gracia, L. Google Scholar
Andres, J. Google Scholar
Longo, E. Google Scholar
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.
xmlui.dri2xhtml.METS-1.0.item-coverage Cambridge
Language English
Sponsor Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior
GeneralitatValenciana
Ministerio de Economia y Competitividad (Spain)
Programa de Cooperacion Cientifica con Iberoamerica (Brasil) of Ministerio de Educacion
Ministerio de Economia y Competitividad, "Salvador Madariaga'' program
Grant number FAPESP: 2012/14004-5, 2013/07296-2, 2013/26671-9, 2013/23995-8, 2014/14171-4, 2017/13008-0, 2017/07240-8
CNPq: 479644/2012-8, 350711/2012-7, 304531/2013-8, 151136/2013-0
GeneralitatValenciana: PrometeoII/2014/022, ACOMP/2014/270, ACOMP/2015/1202
Ministerio de Economia y Competitividad (Spain) : CTQ2015-65207-P
Programa de Cooperacion Cientifica con Iberoamerica (Brasil) of Ministerio de Educacion: PHBP14-00020]
Ministerio de Economia y Competitividad, "Salvador Madariaga'' program: PRX15/00261
Date 2018
Published in Physical Chemistry Chemical Physics. Cambridge, v. 20, n. 3, p. 1923-1937, 2018.
ISSN 1463-9076 (Sherpa/Romeo, impact factor)
Publisher Royal Soc Chemistry
Extent 1923-1937
Origin http://dx.doi.org/10.1039/c7cp07354b
Access rights Closed access
Type Article
Web of Science ID WOS:000423019600061
URI https://repositorio.unifesp.br/handle/11600/54257

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