Synthesis of polyethylenimine/NaYF4 nanoparticles with upconversion fluorescence
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 5786-5791 |
Journal / Publication | Nanotechnology |
Volume | 17 |
Issue number | 23 |
Online published | 10 Nov 2006 |
Publication status | Published - 14 Dec 2006 |
Externally published | Yes |
Link(s)
Abstract
Upconverting materials, which can be efficiently excited by near infrared light and emit strong visible light through a process termed 'upconversion fluorescence', have shown great potential for use in biological labelling and imaging. Some upconverting nanoparticles such as NaYF4 doped with lanthanide ions have been synthesized; however, these nanoparticles are not soluble in water, not biocompatible and do not have functional chemical groups for conjugation of biomolecules, and as a result their bioapplications are very limited unless some surface modifications are performed. Here we report a method for one-pot synthesis of polyethylenimine/NaYF4 nanoparticles doped with lanthanide ions, which are water soluble and biocompatible. The amino groups of polyethylenimine existing on the nanoparticles can be used for attachment of biomolecules. The nanoparticles showed a spherical shape with an average size of about 50 nm. Different lanthanide ions (Yb3+, Er3+ and Tm3+) were doped into the nanoparticles, which showed strong upconversion fluorescence of different colours in aqueous solutions under excitation at 980 nm. © 2006 IOP Publishing Ltd.
Citation Format(s)
Synthesis of polyethylenimine/NaYF4 nanoparticles with upconversion fluorescence. / Wang, Feng; Chatterjee, Dev K; Li, Zhengquan et al.
In: Nanotechnology, Vol. 17, No. 23, 14.12.2006, p. 5786-5791.
In: Nanotechnology, Vol. 17, No. 23, 14.12.2006, p. 5786-5791.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review