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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

ZnWO4 nanocrystals: synthesis, morphology, photoluminescence and photocatalytic properties

Full text
Author(s):
Pereira, P. F. S. [1] ; Gouveia, A. F. [1] ; Assis, M. [1] ; de Oliveira, R. C. [1] ; Pinatti, I. M. [1] ; Penha, M. [1] ; Goncalves, R. F. [2] ; Gracia, L. [3] ; Andres, J. [4] ; Longo, E. [1]
Total Authors: 10
Affiliation:
[1] Fed Univ Sao Carlos UFSCar, CDMF, LIEC, Chem Dept, POB 676, BR-13565905 Sao Carlos, SP - Brazil
[2] Fed Univ Sao Paulo UNIFESP, BR-09972270 Diadema, SP - Brazil
[3] Univ Valencia, Dept Phys Chem, E-46100 Burjassot - Spain
[4] UJI, Dept Analyt & Phys Chem, Castellon de La Plana 12071 - Spain
Total Affiliations: 4
Document type: Journal article
Source: Physical Chemistry Chemical Physics; v. 20, n. 3, p. 1923-1937, JAN 21 2018.
Web of Science Citations: 26
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. (AU)

FAPESP's process: 17/07240-8 - Catalytic activity of the TiO2 nanotube in the water splitting process
Grantee:Amanda Fernandes Gouveia
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 12/14004-5 - Investigation of the photoluminescence and photocatalytic properties of pure and Mn, Cu, and Zn-doped BaWO4 and BaMoO4 powders
Grantee:Júlio César Sczancoski
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 13/23995-8 - Synthesis of silver tungstate doped with Eu3+ and the study of their optical, photoluminescent and photocatalytic properties
Grantee:Ivo Mateus Pinatti
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 17/13008-0 - Metallic nanoparticles-modified by in Situ real-time TEM and Femtosecond pulsed laser and incorporated into Chitosan
Grantee:Paula Fabiana dos Santos Pereira Lima
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 14/14171-4 - Investigation of the crystalline structure and photoluminescence, photocatalytic and antibacterial properties of the nanocrystals (Ag2-2xZnX)WO4 with (x = 0, 0.25, 0.50, 0.75 and 1) incorporated in chitosan
Grantee:Paula Fabiana dos Santos Pereira Lima
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 13/26671-9 - Theoretical and experimental study of multifunctional semiconductors
Grantee:Amanda Fernandes Gouveia
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC