Abstract
Ba1-xCuxWO4 nanoparticles were synthesized by chemical precipitation route. The structural properties of the Ba1-xCuxWO4 samples were characterized by X-ray diffraction, Fourier transformed infrared and Raman spectroscopic studies; morphological and microstructural characterizations were done by transmission electron microscopic and scanning electron microscopic measurements respectively. The optical characterization of the samples were performed by UV–Visible diffuse reflectance and photoluminescence spectroscopic studies, and the magnetic characterization were done by vibration sample magnetometer measurements. The structural characterization confirms the tetragonal scheelite structure for the samples. On doping with Cu atoms, the agglomeration and hence the size of the particles decreases appreciably. The optical bandgap of the samples decreases with increase in the amount of Cu atoms in the Ba1-xCuxWO4 sample, confirming the formation of intermediate energy levels. The absorption edge extends to visible region and the amount absorption increases with the amount of Cu atoms in the Ba1-xCuxWO4 sample. However, photoluminescent emission decreases with the increase in concentration of Cu atoms in the Ba1-xCuxWO4 sample, which also confirm the formation of intermediate energy levels. Vibrating sample magnetometer measurements of the Ba1-xCuxWO4 samples show large variations from the magnetic behaviour of the samples upon doping. The weak ferromagnetic behaviour of the Ba1-xCuxWO4 sample changes to superparamagnetic as the doping concentration increases. Moreover, the Cu doping resulted significant modifications on the structural, optical and magnetic properties of BaWO4 nanoparticles, which make them suitable for potential applications including optoelectronics, biomedical and photocatalytic applications.
Published Version
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