Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 18, Issue 19, Pages 5954-5969Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201102419
Keywords
ionic liquids; luminescence; nanocrystals; rare earths; structure elucidation
Categories
Funding
- National 863 Hi-tech Project of China [2007AA022004]
- National Key Basic Research Program (973 Project) [2010CB933901, 2011CB933100]
- Important National Science & Technology Specific Projects [2009ZX10004-311]
- National Natural Scientific Fund [20803040]
- Ministry of Education of China [NCET-08-0350]
- Shanghai Science and Technology Fund [10XD1406100]
Ask authors/readers for more resources
Herein, we introduce a facile, user- and environmentally friendly (n-octanol-induced) oleic acid (OA)/ionic liquid (IL) two-phase system for the phase- and size-controllable synthesis of water-soluble hexagonal rare earth (RE=La, Gd, and Y) fluoride nanocrystals with uniform morphologies (mainly spheres and elongated particles) and small sizes (<50 nm). The unique role of the IL 1-butyl-3-methylimidazolium hexafluorophosphate (BmimPF6) and n-octanol in modulating the phase structure and particle size are discussed in detail. More importantly, the mechanism of the (n-octanol-induced) OA/IL two-phase system, the formation of the RE fluoride nanocrystals, and the distinctive size- and morphology-controlling capacity of the system are presented. BmimPF6 is versatile in term of crystal-phase manipulation, size and shape maintenance, and providing water solubility in a one-step reaction. The luminescent properties of Er3+-, Ho3+-, and Tm3+-doped LaF3, NaGdF4, and NaYF4 nanocrystals were also studied. It is worth noting that the as-prepared products can be directly dispersed in water due to the hydrophilic property of Bmim+ (cationic part of the IL) as a capping agent. This advantageous feature has made the IL-capped products favorable in facile surface modifications, such as the classic Stober method. Finally, the cytotoxicity evaluation of NaYF4:Yb,Er nanocrystals before and after silica coating was conducted for further biological applications.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available