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

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. 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]
+ Show Author Affiliations
  1. CNR-IMEM, Parma (Italy)
  2. Univ. of Antwerp, Antwerp (Belgium)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Excitonics (CE)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1238783
Grant/Contract Number:  
SC0001088
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; characterization and analytical techniques; nanoparticles

Citation Formats

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., 2016. Web. doi:10.1038/srep19168.
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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. https://doi.org/10.1038/srep19168
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Bertoni, Giovanni, Fabbri, Filippo, Villani, Marco, Lazzarini, Laura, Turner, Stuart, Van Tendeloo, Gustaaf, Calestani, Davide, Gradečak, Silvija, Zappettini, Andrea, and Salviati, Giancarlo. Tue . "Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles". United States. https://doi.org/10.1038/srep19168. https://www.osti.gov/servlets/purl/1238783.
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@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 = {Tue Jan 12 00:00:00 EST 2016},
month = {Tue Jan 12 00:00:00 EST 2016}
}
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