Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/36055
Title: Comparative studies of upconversion luminescence characteristics and cell bioimaging based on one-step synthesized upconversion nanoparticles capped with different functional groups
Authors: Tsang, MK
Chan, CF
Wong, KL
Hao, JH 
Keywords: Upconverting nanoparticles
Surfactant
Color tuning
Bioimaging
Paramagnetic
Issue Date: 2015
Publisher: North-Holland
Source: Journal of luminescence, 2015, v. 157, p. 172-178 How to cite?
Journal: Journal of luminescence 
Abstract: Herein, three types of upconverting NaGdF4:Yb/Er nanoparticles (UCNPs) have been synthesized via one-step hydrothermal synthesis with polyethylene glycol (PEG), polyethylenimine (PEI) and 6-aminocapronic acid (6AA) functionalization. To evident the presence of these groups, FTIR spectra and zeta-potentials were measured to support the successful capping of PEG, PEI and 6AA on the UCNPs. The regular morphology and cubic phase of these functionalized UCNPs were attributed to the capping effect of the surfactants. Tunable upconversion luminescence (UCL) from red to green were observed under 980 nm laser excitation and the UCL tuning was attributed to the presence of various surface ligands. Moreover, surface group dependent UCL bioimaging was performed in HeLa cells. The enhanced UCL bioimaging demonstrated by PEI functionalized UCNPs evident high cell uptake. The significant cell uptake is explained by the electrostatic attraction between the amino groups (-NH2) and the cell membrane. Moreover, the functionalized UCNPs demonstrated low cytotoxicity in MTT assay. Additional, paramagnetic property was presented by these UCNPs under magnetic field.
URI: http://hdl.handle.net/10397/36055
ISSN: 0022-2313
DOI: 10.1016/j.jlumin.2014.08.057
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

14
Last Week
0
Last month
Citations as of May 25, 2017

WEB OF SCIENCETM
Citations

13
Last Week
0
Last month
Citations as of May 21, 2017

Page view(s)

28
Last Week
3
Last month
Checked on May 28, 2017

Google ScholarTM

Check

Altmetric



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