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 nan...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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Nature Publishing Group
2016
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| Online Access: | http://hdl.handle.net/1721.1/101741 |
| _version_ | 1811073823161712640 |
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| author | Bertoni, Giovanni Fabbri, Filippo Villani, Marco Lazzarini, Laura Turner, Stuart Van Tendeloo, Gustaaf Calestani, Davide Gradecak, Silvija Zappettini, Andrea Salviati, Giancarlo |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Bertoni, Giovanni Fabbri, Filippo Villani, Marco Lazzarini, Laura Turner, Stuart Van Tendeloo, Gustaaf Calestani, Davide Gradecak, Silvija Zappettini, Andrea Salviati, Giancarlo |
| author_sort | Bertoni, Giovanni |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T09:39:13Z |
| format | Article |
| id | mit-1721.1/101741 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T09:39:13Z |
| publishDate | 2016 |
| publisher | Nature Publishing Group |
| record_format | dspace |
| spelling | mit-1721.1/1017412022-09-30T15:59:23Z Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles Bertoni, Giovanni Fabbri, Filippo Villani, Marco Lazzarini, Laura Turner, Stuart Van Tendeloo, Gustaaf Calestani, Davide Gradecak, Silvija Zappettini, Andrea Salviati, Giancarlo Massachusetts Institute of Technology. Department of Materials Science and Engineering Gradecak, Silvija 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. Seventh Framework Programme (European Commission) (Grant Agreement n. 265073 ITN-Nanowiring) Seventh Framework Programme (European Commission) (Grant Agreement n. 312483 ESTEEM2 for Integrated Infrastructure Initiative – I3) United States. Dept. of Energy. Office of Basic Energy Sciences (Award DE-SC0001088) 2016-03-18T16:18:05Z 2016-03-18T16:18:05Z 2016-01 2015-06 Article http://purl.org/eprint/type/JournalArticle 2045-2322 http://hdl.handle.net/1721.1/101741 Bertoni, Giovanni, Filippo Fabbri, Marco Villani, Laura Lazzarini, Stuart Turner, Gustaaf Van Tendeloo, Davide Calestani, Silvija Gradecak, Andrea Zappettini, and Giancarlo Salviati. “Nanoscale Mapping of Plasmon and Exciton in ZnO Tetrapods Coupled with Au Nanoparticles.” Scientific Reports 6 (January 12, 2016): 19168. en_US http://dx.doi.org/10.1038/srep19168 Scientific Reports Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ application/pdf Nature Publishing Group Nature Publishing Group |
| spellingShingle | Bertoni, Giovanni Fabbri, Filippo Villani, Marco Lazzarini, Laura Turner, Stuart Van Tendeloo, Gustaaf Calestani, Davide Gradecak, Silvija Zappettini, Andrea Salviati, Giancarlo Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles |
| title | Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles |
| title_full | Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles |
| title_fullStr | Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles |
| title_full_unstemmed | Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles |
| title_short | Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles |
| title_sort | nanoscale mapping of plasmon and exciton in zno tetrapods coupled with au nanoparticles |
| url | http://hdl.handle.net/1721.1/101741 |
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