期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 41, 页码 16589-16596出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm12796a
关键词
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资金
- Concordia University
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- U. Quebec, INRS-EMT
- ITF of Hong Kong [ITS/008/10]
Ultra-small multifunctional KGdF4:Tm3+,Yb3+ nanoparticles with near-infrared to near-infrared upconversion are synthesized. The average sizes of KGdF4:Tm3+ 2%, Yb3+ 20% core-only and KGdF4: Tm3+ 2%, Yb3+ 20%/KGdF4 core-shell nanoparticles are similar to 3.7 nm and similar to 7.4 nm, respectively, which fall within the reported optimal sizes (<10 nm) for bioimaging probes. The excitation and emission at 980 and 803 nm are favorable to deeper tissue penetration and reduced autofluorescence. The weak upconversion luminescence of the ultra-small core-only nanoparticles is overcome by the use of the core-shell approach. The magnetic mass susceptibility and magnetization of the ultra-small core-only and core-shell nanoparticles were determined, and are close to those of large nanoparticles (26 and 50 nm) used for magnetic resonance imaging and bio-separation. There is no variation in the magnetic properties with the nanoparticles' sizes between the core-only (similar to 3.7 nm) and core-shell (similar to 7.4 nm) nanoparticles, which differs from the size-dependent luminescence. The oleate-capped core-shell nanoparticles were further encapsulated with a PEG-phospholipid shell to endow them with dispersibility in water, which is indispensable for future biological applications.
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