Noble metal nanoparticle preparation is an interdisciplinary subject that is attracting intense research and development due to both the fundamental and applied scientific value of nanometer scale metals. Tungstates exhibit photoluminescence properties and antimicrobial action. In addition, silver materials exhibit high photocatalytic properties under visible light for dye degradation, bacteria destruction and electrocatalytic property. This research project aims to investigate the photoluminescent and photocatalytic properties of single crystal tungstate silver (Ag2WO4) and doped with Eu3+ (Ag2-3xEuxWO4), using the method of co precipitation, which is fast, does not need high temperatures or require sophisticated equipment and yields materials with homogeneous shape and size without secondary phases. Emission bands of europium ions are easy to study in the visible region due to the structure of the energy levels, which enables its use as a spectroscopic probe. The luminescence properties of these ions, such as fine lines of absorption and emission, are due to electron transitions within the partially filled 4f layer which is protected from the environment by 5s and 5p external electron. In addition, the europium ion has characteristic red emission, can be use for white LEDs when doped tungstates and for site symmetry determination. The powders will be characterized by X-ray diffraction (XRD), Rietveld Refinement, FT-Raman spectroscopy (Raman), Fourier transform infrared spectroscopy (FT-IR), Ultraviolet-visible spectroscopy (UV-vis), Scanning Electron Microscopy with Field Emission Gun (FEG-SEM), Photocatalysis and Photoluminescence spectroscopy (PL).
News published in Agência FAPESP Newsletter about the scholarship: