金纳米棒对β-NaYF4：Er(3＋),Yb(3＋)@SiO2纳米颗粒上转换发光的表面等离子增强

Plasmon Enhanced Upconversion and of β-NaYF_4:Er^(3+),Yb^(3+)@SiO_2 Nanoparticles with Au Nanorods

采用晶种法合成了金纳米棒和共沉淀法制备了β-NaYF_4:Er^(3+),Yb^(3+)@SiO_2上转换纳米发光材料,并利用St9ber法制备了可溶于水的β-NaYF_4:Er^(3+),Yb^(3+)@SiO_2@SiO_2纳米颗粒.利用上转换荧光光谱研究了不同浓度的金纳米棒对β-NaYF_4:Er^(3+),Yb^(3+)@SiO_2上转换红光(655 nm)和绿光(540,520 nm)发射的影响.得到当金纳米棒颗粒的掺杂浓度为0.03%时,对β-NaYF_4:Er^(3+),Yb^(3+)@SiO_2的上转换发光增强最大.红光和绿光的最大增强因子分别为2.75和1.66.通过调控金纳米棒加入量,可以调节材料的上转换红绿光比.因此,这种纳米复合材料可以作为生物荧光标记,在很大程度上提高生物鉴定准确性,在生物医学检测等方面有着重要的应用前景.

The Au nanorods （NRs） were synthesized by the seed-mediated method. The 13- Er3 ＋ yb3 ＋ NaYF#： , upconversion nanophosphors were synthesized by the co-precipitation method. The water-soluble 13-NaYF4 ： Er3 ＋ , Yb3 ＋@ SiO2 nanoparticles were prepared from 13-NaYF4 ： Er3＋ , Yb3＋ by the StiSber method. The imquenee of doping concentration of Au NRs to red （655 nm） and green （540, 520 nm） emission of 13-NaYF4： Er3＋ , Yb3＋ was also studied. The upconversion lumi- nescence reached maximum while doping concentration of Au NRs was 0. 03%. The largest enhance- ment factors of red and green upconversion emission were 2. 75 and 1.66, respectively. The ratio of red and green emissions of the upconversion nanoparticles can be conveniently adjusted by altering the adding amount of Au NRs. Therefore, this kind of nanoeomposites can be used as a biological fluores- eent labeling, improving the biological identification aceuracy greatly. This nanocomposites can be ap- plied in several fields, such as biomedical detection.