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

被引：25

作者：

Bertoni, Giovanni ^{[1
]}

Fabbri, Filippo ^{[1
]}

Villani, Marco ^{[1
]}

Lazzarini, Laura ^{[1
]}

Turner, Stuart ^{[2
]}

Van Tendeloo, Gustaaf ^{[2
]}

Calestani, Davide ^{[1
]}

Gradecak, Silvija ^{[3
]}

Zappettini, Andrea ^{[1
]}

Salviati, Giancarlo ^{[1
]}

机构：

[1] CNR IMEM, IT-43124 Parma, Italy

[2] Univ Antwerp, EMAT, BE-2020 Antwerp, Belgium

[3] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

来源：

SCIENTIFIC REPORTS | 2016年 / 6卷

基金：

欧洲研究理事会;

关键词：

ENERGY-LOSS SPECTROSCOPY; GOLD NANOPARTICLES; PHOTOCHEMICAL-SYNTHESIS; RAPID SYNTHESIS; ENHANCEMENT; NANORODS; CATHODOLUMINESCENCE; NANOSTRUCTURES; ABSORPTION; SCATTERING;

D O I：

10.1038/srep19168

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 (similar to 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.

引用

页数：8

共 43 条

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