Water-Soluble Monodispersed Lanthanide Oxide Submicrospheres: PVP-Assisted Hydrothermal Synthesis, Size-Control and Luminescence Properties
Water-Soluble Monodispersed Lanthanide Oxide Submicrospheres: PVP-Assisted Hydrothermal Synthesis, Size-Control and Luminescence Properties
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水溶性单分散稀土氧化物亚微球：PVP 辅助水热合成、尺寸控制和发光性能
DOI：
10.1002/cphc.201100806
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发表时间：
2012-07-16
期刊：
影响因子：
2.9
通讯作者：
Wang, Dan
中科院分区：
文献类型：
--
作者：
Cui, Ying;Lai, Xiaoyong;Wang, Dan
以稀土氧化物为原料，尿素为沉淀剂，聚乙烯吡咯烷酮（PVP）为表面活性剂，采用水热法制备了一类粒径可控的单分散稀土化合物亚微球。根据相应镧系元素的固有性质，所得产物可以是氧化物、氢氧化物或碱性碳酸盐的形式。这些镧系元素氢氧化物或碱性碳酸盐可以通过煅烧容易地转化为它们相应的氧化物，保持相同的形态和尺寸分散。研究了这些镧系化合物亚微球的形成机理，发现PVP在形成均匀、分散性好的产物中起着关键作用。此外，该方法还可以推广到二元体系，以两种稀土氧化物为原料，制备掺杂型稀土氧化物亚微球（如Y2O3：Eu3+）。Y2O3：Eu3+亚微球具有近均匀的球形形貌和窄的尺寸分布，以及良好的水溶性和尖锐的610 nm光谱发射（对应于Eu3+的5D07F2跃迁）。这使得它们成为在荧光灯、场发射显示器（FED）或LCD等领域应用的有吸引力的材料，或者作为生物医学标记和分子探针。
We report a facile hydrothermal synthetic route to prepare a class of monodispersed lanthanide-based compound submicrospheres with controllable size, which employs raw lanthanide oxides as starting material, urea as precipitator and poly(N-vinyl-2-pyrrolidone) (PVP) as surfactant. Dependent on the intrinsic properties of respective lanthanide, the resulting products could be in the form of oxide, hydroxide or basic carbonate. These lanthanide hydroxides or basic carbonates can be easily transformed into their corresponding oxides by calcination, retaining the same morphology and size dispersion. The formation mechanism of these lanthanide-based compound submicrospheres is investigated and PVP plays a critical role in forming uniform and well-dispersed products. Furthermore, this method could be extended to a binary system by using two kinds of lanthanide oxides as starting material, resulting in doped-type lanthanide oxide submicrospheres (such as Y2O3:Eu3+). The Y2O3:Eu3+ submicrospheres exhibit nearly uniform spherical morphology and narrow size distribution as well as good water solubility and sharp spectral emission at 610 nm (corresponding to the 5D07F2 transition of Eu3+). This makes them attractive materials for applications in fields such as fluorescent lamps, field emission displays (FEDs) or LCDs, or as biomedical labels and molecular probes.