Please use this identifier to cite or link to this item: https://doi.org/10.1039/c2nr31241g
Title: Plasmon enhanced upconversion luminescence of NaYF 4:Yb, Er@SiO 2@Ag core-shell nanocomposites for cell imaging
Authors: Yuan, P.
Lee, Y.H.
Gnanasammandhan, M.K.
Guan, Z.
Zhang, Y. 
Xu, Q.-H. 
Issue Date: 21-Aug-2012
Citation: Yuan, P., Lee, Y.H., Gnanasammandhan, M.K., Guan, Z., Zhang, Y., Xu, Q.-H. (2012-08-21). Plasmon enhanced upconversion luminescence of NaYF 4:Yb, Er@SiO 2@Ag core-shell nanocomposites for cell imaging. Nanoscale 4 (16) : 5132-5137. ScholarBank@NUS Repository. https://doi.org/10.1039/c2nr31241g
Abstract: NaYF 4:Yb,Er@SiO 2@Ag core-shell nanocomposites were prepared to investigate metal-enhanced upconversion luminescence. Two sizes (15 and 30 nm) of Ag nanoparticles were used. The emission intensity of the upconversion nanocrystals was found to be strongly modulated by the presence of Ag nanoparticles (NPs) on the outer shell layer of the nanocomposites. The extent of modulation depended on the separation distance between Ag NPs and upconversion nanocrystals. The optimum upconversion luminescence enhancement was observed at a separation distance of 10 nm for Ag NPs with two different sizes (15 and 30 nm). A maximum upconversion luminescence enhancement of 14.4-fold was observed when 15 nm Ag nanoparticles were used and 10.8-fold was observed when 30 nm Ag NPs were used. The separation distance dependent emission intensity is ascribed to the competition between energy transfer and enhanced radiative decay rates. The biocompatibility of the nanocomposites was significantly improved by surface modification with DNA. The biological imaging capabilities of these nanocomposites were demonstrated using B16F0 cells. © 2012 The Royal Society of Chemistry.
Source Title: Nanoscale
URI: http://scholarbank.nus.edu.sg/handle/10635/88038
ISSN: 20403364
DOI: 10.1039/c2nr31241g
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

144
checked on Jul 14, 2018

WEB OF SCIENCETM
Citations

135
checked on Jun 19, 2018

Page view(s)

54
checked on Jun 8, 2018

Google ScholarTM

Check

Altmetric


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