CdMoO4 synthesized by a microwave-assisted hydrothermal method and their photoluminescence and photocatality properties

A.P. de Moura, L.H. Oliveira, C.S. Xavier, I.L.V. Rosa, M.S. Li, E. Longo, J.A. Varela
Universidade Estadual Paulista, BR

Keywords: nanostructured, photoluminescence, photocatalytic activity, microwave hydrothermal

Summary:

Metal molybdates had a high application potential in various fields such as photoluminescence, microwave applications, optical fibers, scintillator materials, humidity sensors, and catalysis. In this work CdMoO4 nanoparticles were obtained under hydrothermal conditions using microwave radiation at 100 °C for different times. The formation of completely crystalline CdMoO4 was observed for all samples by X-ray patterns. All diffraction peaks can be perfectly indexed to the tetragonal phase of CdMoO4 (JCPDS 07-0205), indicating the single phase formation according to FT-Raman. The morphology and structure have further been characterized using field emission gun scanning electron microscopy. It is clear that the shell is composed of nanorods with small spheres of length. The PL emission spectra of metal molibdates have been discussed in the frame of molecular orbital models of the [MoO6]6− group. The measured emission spectra of metal tungstates are attributed mainly to charge-transfer transitions within the [MoO6]6− complex. The samples exhibits strong PL emission in the green wavelength range of 540-546 nm. Photocatalytic activity of CdMoO4 nanocrystals was examined by monitoring the degradation of rhodamine B dye in an aqueous solution under UV radiation of 254 nm. This behavior show the semiconductor nanoparticle will present excellent photocatalytic activity for technological uses.