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以聚乙二醇(PEG)为溶剂,用多元醇法制备了Tb~(3+)掺杂的纳米Gd_2O_3并在其表面包覆聚硅氧烷壳层,得到了Gd_2O_3∶Tb~(3+)/SiO_x纳米颗粒,研究了不同分子量(200、400、600)PEG对纳米颗粒尺寸及发光的影响。扫描电镜图像表明样品均为分散的球形,其中PEG200制备出的纳米颗粒具有明显核壳结构。马尔文激光粒度仪测试结果表明随着PEG分子量的增大,包覆前的颗粒粒径分别为78、21和28nm,包覆后的颗粒粒径分别为140、32和38nm;发射光谱表明:与PEG400和PEG600相比,PEG200合成出的纳米颗粒的荧光性能最佳。
Tb 3+ doped nano-Gd 2 O 3 was prepared by polyhydric alcohol method with polyethylene glycol (PEG) as solvent and polysiloxane shell was coated on the surface. Gd 2 O 3: Tb 3+ ) / SiO_x nanoparticles, the effects of different molecular weight (200,400,600) PEG on the size and luminescence of the nanoparticles were investigated. Scanning electron microscopy images showed that the samples were all spheroids. The nanoparticles prepared by PEG200 had obvious core-shell structure. Malvern laser particle size analyzer test results show that with the PEG molecular weight increases, the particle size before coating were 78,21 and 28nm, particle size after coating were 140,32 and 38nm; emission spectra showed that: Compared with PEG400 and PEG600, PEG200 synthesized nanoparticles showed the best fluorescence properties.