Synthesis and Photoluminescent Properties of Strontium Tungstate Nanostructures

Strontium tungstate nanoparticles with diameters of 40−50 nm, nanopeanuts with diameters of 100−150 nm, and nanorods with a rough surface were controllably synthesized by a solvothermal-mediated microemulsion method. Various comparison experiments showed that several experimental parameters, such as the molar ratio ( w ) between water and CTAB and the concentration of reactants, played important roles for the morphological control of Sr(NO 3 ) 2 nanostructures. When the concentration of the Sr(NO 3 ) 2 aqueous solution was kept at 0.3 M, the morphology of the as-synthesized products elongated from nanospheres, to nanopeanuts, and to nanorods with the increase of the w value. A possible mechanism is proposed for the selective formation of the different morphologies. The SrWO 4 samples with different morphologies exhibited different photoluminescent properties. X-ray powder diffraction, transmission electron microscopy, selected area electron diffraction, and field-emission scanning electron microscopey were used to characterize these products.