期刊
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
卷 -, 期 12, 页码 1813-1819出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.200901119
关键词
Hydrothermal synthesis; Rare earths; Crystal growth; Polymers; Luminescence; Ostwald ripening
资金
- Academy of Sciences of China
- Royal Netherlands Academy of Sciences of the Netherlands
- National Natural Science Foundation of China [10904142, 10874180]
The hexagonal-phase NaYF4:Yb3+, Er3+ hollow nanospheres (HNS) have been successfully prepared for the first time by means of a hydrothermal route with the aid of polyethylenimine (PEI) as a surfactant. The nitrogen adsorption/desorption isotherms demonstrated the porous nature of the NaYF4 HNS. The formation mechanism was explored based on the effects of the reaction parameters. The NaYF4 solid spheres underwent a dissolution-recrystallisation transformation and a hollowing process when the hydrothermal reaction time was prolonged. The localised Ostwald ripening mechanism was proposed to account for the formation of NaYF4 HNS, in which loose aggregations were found to be crucial. The upconversion luminescence of NaYF4:Yb3+, Er3+ HNS was also investigated. It is expected that these NaYF4 FINS might have potential in applications as building blocks for biolabels and drug-delivery.
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