Abstract
A microemulsion-mediated hydrothermal method for synthesis of YVO 4:RE (RE=Yb 3+/Er 3+, Yb 3+/Tm 3+) nanoparticles by hydrothermal treatment of quaternary microemulsion medium consisting of Na 3VO 4/NaOH and RE(NO 3) 3 aqueous solution, surfactant cetyltrimethylammonium bromide (CTAB), cosurfactant n-hexanol and oil phase n-heptane was report. The confinement of microemulsion droplets acting as microreactors during the reaction process allows the formation of small size YVO 4:RE nanoparticles with relatively narrow size distribution and less aggregation. The structure, size and shape of YVO 4:RE nanoparticles were investigated by means of X-ray diffractometry (XRD) and transmission electron microscopy (TEM). Compared with the conventional solid annealing diffusion method, the microemulsion-mediated hydrothermal method shows superiority in obtaining YVO 4:RE nanoparticles with controllable size, narrow size distribution and less aggregation. The microemulsion-mediated hydrothermal method may be potentially applicable for synthesis of other rare earth doped up-converting luminescence nanomaterials.
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