ZnWO4 nanocrystals: synthesis, morphology, photoluminescence and photocatalytic properties

• DOI: 10.1039/c7cp07354b
• Publication Date: 2017-12-15T10:35:00Z
• Authors: P. F. S. Pereira; A. F. Gouveia; M. Assis; R. C. de Oliveira; I. M. Pinatti; M. Penha; R. F. Gonçalves; L. Gracia; J. Andrés; E. Longo
• Keywords: Ultraviolet

The present joint experimental and theoretical work provides in-depth understanding on the morphology structural, electronic, optical properties of ZnWO4 nanocrystals. Monoclinic nanocrystals were prepared at three different temperatures (140, 150, 160 °C) by a microwave hydrothermal method. Then, samples investigated X-ray diffraction with Rietveld refinement analysis, field-emission scanning electron microscopy, transmission electronic micro-Raman Fourier transform infrared spectroscopy, ultraviolet-visible photoluminescence measurements. First-principles calculations within framework density functional theory employed to provide information atomic level. band structure diagram, states, Raman spectra calculated understand effect structural order-disorder ZnWO4. effects synthesis temperature above rationalized. revealed direct allowed transitions between VB CB results in region consistent results. Moreover, surface association energy stabilization used 140, °C attributed oxygen vacancies [WO6] [ZnO6] clusters, causing red shift spectra. obtained exhibited excellent photodegradation Rhodamine under ultraviolet light irradiation, which was found be related types clusters formed catalyst.