Publication Type Journal Article
Title Gold Nanoparticles in Core-Polyelectrolyte-Shell Assemblies Promote Large Enhancements of Phthalocyanine Fluorescence
Authors Raquel Teixeira Pedro M. R. Paulo Sílvia M. B. Costa
Groups MPPM
Journal JOURNAL OF PHYSICAL CHEMISTRY C
Year 2015
Month September
Volume 119
Number 37
Pages 21612-21619
Abstract We have incorporated gold nanoparticles into a core-polyelectrolyte-shell type of assembly with a coating lipid vesicle encapsulating a phthalocyanine dye. The supramolecular construct having polyelectrolyte layers as spacers between the particle s surface and the phthalocyanine was designed to control the emission enhancement through the plasmonic antenna effect of gold nanoparticles. We have observed large emission enhancements, of about 3 orders of magnitude, for an optimum number of 13 to 15 polyelectrolyte layers. Such large emission enhancements were attributed to hot-spots formed by the clustering of gold nanoparticles during the process of layer-by-layer deposition of polyelectrolytes. Fluorescence lifetime imaging microscopy allowed a correlation of those large emission enhancements with shortening of emission lifetimes, as expected from the plasmonic enhancement of radiative and nonradiative rates. It has also shown that these polyelectrolyte-assembled clusters of gold nanoparticles are of submicrometric size, which makes these nano-objects promising for enhanced imaging or biosensing applications.
DOI http://dx.doi.org/10.1021/acs.jpcc.5b04667
ISBN
Publisher AMER CHEMICAL SOC
Book Title
ISSN 1932-7447
EISSN
Conference Name
Bibtex ID ISI:000361868400037
Observations
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