Title
Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
London :Nature Publishing Group ,
Subject
Physics
Engineering sciences. Technology
Source (journal)
Scientific reports. - London, 2011, currens
Volume/pages
6(2016) , 8 p.
ISSN
2045-2322
2045-2322
Article Reference
19168
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Metallic nanoparticles can be used to enhance optical absorption or emission in semiconductors, thanks to a strong interaction of collective excitations of free charges (plasmons) with electromagnetic fields. Herein we present direct imaging at the nanoscale of plasmon-exciton coupling in Au/ZnO nanostructures by combining scanning transmission electron energy loss and cathodoluminescence spectroscopy and mapping. The Au nanoparticles (~30 nm in diameter) are grown in-situ on ZnO nanotetrapods by means of a photochemical process without the need of binding agents or capping molecules, resulting in clean interfaces. Interestingly, the Au plasmon resonance is localized at the Au/vacuum interface, rather than presenting an isotropic distribution around the nanoparticle. On the contrary, a localization of the ZnO signal has been observed inside the Au nanoparticle, as also confirmed by numerical simulations.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/1c1931/130406.pdf
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