两亲配体包覆法制备水溶性Mn~(2+)掺杂NaYF_4:Yb~(3+)/Er~(3+)纳米粒子

采用水热法,以稀土硝酸盐为原材料合成了油酸(OA)包覆的Mn~(2+)掺杂Na YF_4:Yb~(3+)/Er~(3+)(Mn~(2+)dopedNa YF_4:Yb~(3+)/Er~(3+))纳米粒子(UCNPs),然后将氨基修饰的聚乙二醇与聚马来酸酐十八烯反应生成的两亲性聚合物m PEG-PMAO作为亲水性配体,通过两亲配体包覆法制备具有水溶性的Mn~(2+)掺杂Na YF_4:Yb~(3+)/Er~(3+)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(FT-IR)及热重分析仪(TGA)对合成的样品进行了表征.结果表明,m PEG-PMAO聚合物包覆的Mn~(2+)掺杂Na YF_4:Yb~(3+)/Er~(3+)纳米粒子具有较好的水分散性,且粒子的平均粒径约为17.25 nm.

Synthesis of Water Dispersible Mn2 doped NaYF4:Yb3 /Er3 Nanoparticles by Coating Amphiphilic Polymer

Mn2 doped-NaYF4:Yb3 /Er3 nanoparticles are synthesized by one-step hydrothermal method using rare-earth nitrate as raw materials, and then the hydrophobic nanoparticles are transferred into water through coating amphiphilic polymer mPEG-PMAO. Subsequently, the samples are characterized with transmission electron microscopy (TEM),dynamic light scattering (DLS), X-ray diffraction (XRD),fluorescence spectrophotometer, Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analyzer (TGA). The results reveal that the average size of mPEG-PMAO coated Mn2 doped- NaYF4:Yb3 /Er3 nanoparticles are about 17.25 nm and exhibit good dispersability in water.