Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/17467
Title: Water dispersible ultra-small multifunctional KGdF4:Tm 3+, Yb3+ nanoparticles with near-infrared to near-infrared upconversion
Authors: Wong, HT
Vetrone, F
Naccache, R
Chan, HLW 
Hao, J 
Capobianco, JA
Issue Date: 2011
Source: Journal of materials chemistry, 2011, v. 21, no. 41, p. 16589-16596 How to cite?
Journal: Journal of Materials Chemistry 
Abstract: Ultra-small multifunctional KGdF4:Tm3+,Yb 3+ nanoparticles with near-infrared to near-infrared upconversion are synthesized. The average sizes of KGdF4:Tm3+ 2%, Yb 3+ 20% core-only and KGdF4:Tm3+ 2%, Yb 3+ 20%/KGdF4 core-shell nanoparticles are ∼3.7 nm and ∼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 (∼3.7 nm) and core-shell (∼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.
URI: http://hdl.handle.net/10397/17467
ISSN: 0959-9428
DOI: 10.1039/c1jm12796a
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