以三聚氰胺-甲醛微球为模板制备均一氧化钇空心球

Preparation of Uniform Y_2O_3 Hollow Spheres by Using Melamine-formaldehyde Microspheres as Templates

利用三聚氰胺和甲醛在水溶液中缩聚交联生成的单分散三聚氰胺-甲醛(MF)微球为模板,尿素为沉淀剂,通过均相沉淀法制备出核壳结构前驱体,煅烧除去模板,得到氧化钇(Y_2O_3)空心球。通过傅立叶红外光谱(FT-IR)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)、X射线衍射分析(XRD)、X射线能谱仪(XPS)、热重分析(TG)和差示扫描量热分析(DSC)对Y_2O_3空心球的形貌与结构组成进行表征。结果表明,经煅烧后,MF模板可被有效去除,无定形的前驱体转变成结晶的Y_2O_3,生成粒径约1.7μm、壳层厚度为100 nm的Y_2O_3空心球。

Monodispersed MF microspheres were fabricated by melamine formaldehyde polycondensation crosslinking process in aqueous solution, the core - shell structure precursor was prepared by a urea - based homogeneous precipitation technique with MF microspheres as templates, and Y2O3 hollow microspheres were obtained by calcination to remove tempalt- es. The morphology and structure of Y2O3 hollow microspheres were characterized by Fourier transform infrared spectroscopy （ FT - IR）, scanning electron microscopy （ SEM）, transmission electron microscopy （ TEM ）, X - ray diffraction analysis （XRD）, X -ray energy dispersive spectroscopy （XPS）, thermal gravimetric analysis （TG） and differential scanning calorim- etry （DSC）. The results show that the MF templates can be effectively removed and the amorphous precursor has converted to crystalline Y2O3 during the annealing progress. Y2O3 hollow spheres were generated with particle size of about 1.7μm and the shell thickness of 100 nm.