Plasmonic Oligomers with Tunable Conductive Nanojunctions.

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ID: 77510
2019
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Abstract
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, control of the welding and subsequent hot spot characteristics 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 red shift of the longitudinal plasmon modes into the mid-infrared region, while the addition of palladium results in a red shift accompanied by significant plasmon damping.
Reference Key
li2019plasmonicthe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Li, Xiaoyan;Lyu, Jieli;Goldmann, Claire;Kociak, Mathieu;Constantin, Doru;Hamon, Cyrille;
Journal The journal of physical chemistry letters
Year 2019
DOI
10.1021/acs.jpclett.9b03185
URL
Keywords
microstructure heat treatment chemical and phase composition intergranular corrosion resistance laser beam welding

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