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Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2019

Plasmonic Oligomers with Tunable Conductive Nanojunctions

Jieli Lyu
Claire Goldmann
Mathieu K Kociak
Doru Constantin
Cyrille Hamon

Résumé

Engineering plasmonic hot-spots is essential for applications of plasmonic nanoparticles. A particularly appealing route is to weld plasmonic nanoparticles together to form more complex structures sustaining plasmons with symmetries targeted to given applications. However, the control of the welding and subsequent hotspot characteristic is still challenging. Herein, we demonstrate an original method that connects gold particles to their neighbors by another metal of choice. We first assemble gold bipyramids in a tip-to-tip configuration, yielding short chains of variable length and grow metallic junctions in a second step. We follow the chain formation and the deposition of the second metal (i.e. silver or palladium) via UV/Vis spectroscopy and we map the plasmonic properties using electron energy loss spectroscopy. The formation of silver bridges leads to a huge redshift of the longitudinal plasmon modes into the mid-infrared region, while the addition of palladium results in a redshift accompanied by significant plasmon damping.
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Dates et versions

hal-02348902 , version 1 (05-11-2019)

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Xiaoyan Li, Jieli Lyu, Claire Goldmann, Mathieu K Kociak, Doru Constantin, et al.. Plasmonic Oligomers with Tunable Conductive Nanojunctions. Journal of Physical Chemistry Letters, 2019, ⟨10.1021/acs.jpclett.9b03185⟩. ⟨hal-02348902⟩
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