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 | Publisher: | Royal Society of Chemistry | 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 | EISSN: | 1364-5501 | DOI: | 10.1039/c1jm12796a |
Appears in Collections: | Journal/Magazine Article |
Show full item record
SCOPUSTM
Citations
127
Last Week
0
0
Last month
3
3
Citations as of Feb 20, 2019
WEB OF SCIENCETM
Citations
124
Last Week
0
0
Last month
4
4
Citations as of Feb 17, 2019
Page view(s)
99
Last Week
0
0
Last month
Citations as of Feb 19, 2019

Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.