Synthesis, Characterization and Optical Activity of RE-doped ZnWO4 Nanorods and Nanospheres by Hydrothermal Method

Author(s)

Mesquita Borges, Kellen Cristina ; Goncalves, Rosana de Fatima ; de Matos Rodrigues, Murillo Henrique ; Reinalda Arruda, Rivia Aparecida ; de Cassia Santos, Maria Rita ; Azevedo Marques, Ana Paula ; Godinho Junior, Mario

• Document type: Journal article
• Source: ORBITAL-THE ELECTRONIC JOURNAL OF CHEMISTRY; v. 11, n. 2, p. 4-pg., 2019-04-01.

Abstract

This work has investigated the effect of different dopants on structure, morphology and optical property of ZnWO4. Rare-earth doped ZnWO4 (ZnWO4:RE, with 0.5, 1, and 2 mol% of Eu3+ and Pr3+) were successfully synthesized by coprecipitation method followed by microwave-assisted hydrothermal system at 140 degrees C for 1 h. XRD indicated that the crystals have a wolframite- type monoclinic structure and with the addition of dopants the crystallite size decreased. HR-TEM images revealed interesting homogenous nanorods for pure ZnWO4 crystals with grow along (021) direction. For ZnWO4: RE we have found nanospheres morphologies, in which the decreasing crystal size were dependent on the RE doping concentration. IR spectra confirm the crystals structure. Ultraviolet-Visible diffuse reflectance spectra indicated that the optical band gap varies with increasing replacement of Zn2+ by RE ions. E-gap was characteristic of semiconductor materials. (AU)

• 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