Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210093, P. R. China.
Langmuir. 2013 Dec 23;29(51):15992-6001. doi: 10.1021/la403476f. Epub 2013 Dec 11.
Hollow spheres of heavy lanthanide orthovanadates (LnVO4, Ln = Tb, Dy, Er, Tm, Yb, Lu) and yolk-shell structures of Ho(OH)CO3@HoVO4 have been successfully prepared by employing Ln(OH)CO3 colloidal spheres as a sacrificial template and NH4VO3 as a vanadium source. In particular, the as-obtained LuVO4 hollow spheres are assembled from numerous hollow-structured elliptic nanoparticles, and their textural parameters such as the inner and outer diameters, shell thicknesses, and number of shells could be finely tuned through introducing different amounts of NH4VO3 and employing Lu(OH)CO3 templates with different sizes. The possible mechanisms for the formation of hollow spheres and yolk-shell structures, and also the hollow-structured elliptic nanoparticles of LuVO4, i.e., building blocks of LuVO4 hollow spheres, are proposed and discussed in detail. Under ultraviolet excitation, the obtained LuVO4:Eu(3+) hollow spheres show strong red emissions located in the saturated color region, and the modulation of emission intensity and color purity could be realized by tuning the textural parameters of the obtained hollow spheres. It was found that the nanostructure of the building blocks of LuVO4:Eu(3+) hollow spheres also had an effect on the luminescent properties of the as-obtained materials. Moreover, the quantum efficiency could be affected by the textural parameters of the as-obtained LuVO4:Eu(3+) hollow spheres, and the double-shelled LuVO4:Eu(3+) hollow sphere has the highest quantum efficiency. In addition, the excellent biocompatibility indicates the potential biological applications of LuVO4 hollow spheres.
已经成功地使用 Ln(OH)CO3 胶体球作为牺牲模板和 NH4VO3 作为钒源，制备了重镧系 orthovanadates（LnVO4，Ln = Tb，Dy，Er，Tm，Yb，Lu）的空心球和 Ho(OH)CO3@HoVO4 的蛋黄壳结构。特别是，所获得的 LuVO4 空心球由许多空心结构的椭圆纳米颗粒组装而成，并且可以通过引入不同量的 NH4VO3 和使用具有不同尺寸的 Lu(OH)CO3 模板来精细调节其结构参数，如内外径、壳厚和壳数。详细提出并讨论了形成空心球和蛋黄壳结构以及 LuVO4 的空心结构椭圆纳米颗粒（即 LuVO4 空心球的构建块）的可能机制。在紫外光激发下，所获得的 LuVO4:Eu(3+)空心球显示出位于饱和颜色区域的强红色发射，并且可以通过调节所获得的空心球的结构参数来实现发射强度和颜色纯度的调制。发现 LuVO4:Eu(3+)空心球的构建块的纳米结构也对所得材料的发光性能有影响。此外，荧光量子效率会受到所获得的 LuVO4:Eu(3+)空心球的结构参数的影响，而双层 LuVO4:Eu(3+)空心球具有最高的荧光量子效率。此外，优异的生物相容性表明 LuVO4 空心球具有潜在的生物应用。
