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 |
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Conference Name |
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Bibtex ID |
ISI:000361868400037 |
Observations |
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