水分散性发红光Mn^(2+)掺杂NaYF_4:Yb^(3+)/Er^(3+)上转换纳米粒子的合成

Synthesis of Red Luminescent Mn^(2+)Doped NaYF_4:Yb^(3+)/Er^(3+)Nanoparticles Modified with Triton-Phosphate

以稀土硝酸盐为原料,采用水热法合成油酸包覆的发红光Mn^(2+)掺杂NaYF_4:Yb^(3+)/Er^(3+)(Mn^(2+)doped-NaYF_4:Yb^(3+)/Er^(3+))上转换纳米粒子,然后以曲拉通磷酸酯为亲水性配体,通过配体交换法将油酸包覆的油分散性Mn^(2+)doped-NaYF_4:Yb^(3+)/Er^(3+)上转换纳米粒子转变成曲拉通磷酸酯包覆的水分散性纳米粒子.随后采用透射电子显微镜(TEM)、动态光散射仪(DLS)、X射线衍射仪(XRD)、荧光分光光度计、傅立叶变换红外光谱仪(FTIR)及热重分析仪(TGA)对合成样品进行表征.结果表明:曲拉通磷酸酯包覆的Mn^(2+)doped-NaYF_4:Yb^(3+)/Er^(3+)上转换纳米粒子平均粒径为19.54 nm,具有良好的水分散性.

Mn 2 ＋ doped-NaYF 4 ： Yb 3 ＋/Er 3＋ nanoparticles are synthesized by one-step hydrothermal method using rare-earth nitrate as raw materials, and then the hydrophobic nanoparticles are transferred into water dispersible nanoparticles through the ligand-ex- change method using triton-phosphateas as the hydrophilic ligand. The samples are characterized with transmission electron microscopy （TEM）, dynamic light scattering （DLS）, X-ray diffraction （XRD）, fluorescence spectrophotometer, Fourier transform infrared spec- troscopy （FTIR） and thermogravimetric analyzer （TGA）. The results reveal that the average size of triton-phosphate modified Mn2＋ doped-NaYF4 ：Yb3＋/Er3＋ nanoparticles are about 19.54 nm and exhibit good water dispensability.