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Title: Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles

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. Moreover, on the contrary, a localization of the ZnO signal has been observed inside the Au nanoparticle, as also confirmed by numerical simulations.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [3] ;  [1] ;  [1]
  1. CNR-IMEM, Parma (Italy)
  2. Univ. of Antwerp, Antwerp (Belgium)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Grant/Contract Number:
SC0001088
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
characterization and analytical techniques; nanoparticles
OSTI Identifier:
1238783

Bertoni, Giovanni, Fabbri, Filippo, Villani, Marco, Lazzarini, Laura, Turner, Stuart, Van Tendeloo, Gustaaf, Calestani, Davide, Gradečak, Silvija, Zappettini, Andrea, and Salviati, Giancarlo. Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles. United States: N. p., Web. doi:10.1038/srep19168.
Bertoni, Giovanni, Fabbri, Filippo, Villani, Marco, Lazzarini, Laura, Turner, Stuart, Van Tendeloo, Gustaaf, Calestani, Davide, Gradečak, Silvija, Zappettini, Andrea, & Salviati, Giancarlo. Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles. United States. doi:10.1038/srep19168.
Bertoni, Giovanni, Fabbri, Filippo, Villani, Marco, Lazzarini, Laura, Turner, Stuart, Van Tendeloo, Gustaaf, Calestani, Davide, Gradečak, Silvija, Zappettini, Andrea, and Salviati, Giancarlo. 2016. "Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles". United States. doi:10.1038/srep19168. https://www.osti.gov/servlets/purl/1238783.
@article{osti_1238783,
title = {Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles},
author = {Bertoni, Giovanni and Fabbri, Filippo and Villani, Marco and Lazzarini, Laura and Turner, Stuart and Van Tendeloo, Gustaaf and Calestani, Davide and Gradečak, Silvija and Zappettini, Andrea and Salviati, Giancarlo},
abstractNote = {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. Moreover, on the contrary, a localization of the ZnO signal has been observed inside the Au nanoparticle, as also confirmed by numerical simulations.},
doi = {10.1038/srep19168},
journal = {Scientific Reports},
number = ,
volume = 6,
place = {United States},
year = {2016},
month = {1}
}