Precipitate synthesis of BaMoO4 and BaWO4 nanoparticles at room temperature and their photoluminescence properties

Abstract

The uniform BaMoO4 and BaWO4 nanoparticles (NPs) have been successfully synthesized by solution route – the direct precipitation of Ba(NO3)2 and Na2MO4 (M=Mo and W) in ethylene glycol under 24h stirring. The XRD patterns and SEM images proved that the products were tetragonal structured BaMoO4 and BaWO4 with uniform round nanoparticles. Shape, average particle size and particle-size distribution of products were analyzed by TEM – showing the round nanoparticles with the average size of 31.52±4.65nm for BaMoO4, and 59.77±9.61nm for BaWO4. The room temperature photoluminescence (PL) indicated that the products have strong blue emission centered at 441nm – excited with 280nm wavelength for BaMoO4 NPs, and strong violet emission centered 378nm – excited with 344nm wavelength for BaWO4 NPs. These PL behaviors attributed the existence of intrinsic transitions in the [MO4]2- (M=Mo and W) tetrahedrons of their crystal lattices.