Portalès Hervé, Goubet Nicolas, Casale Sandra, Xu Xiang Zhen, Ariane Mostapha, Mermet Alain, Margueritat Jérémie, Saviot Lucien
Sorbonne Université, CNRS, MONARIS, UMR 8233, 4 place Jussieu, 75005 Paris, France.
Sorbonne Université, CNRS, LRS, UMR 7197, 4 Place Jussieu, 75005 Paris, France.
ACS Nano. 2020 Apr 28;14(4):4395-4404. doi: 10.1021/acsnano.9b09993. Epub 2020 Mar 24.
We report the synthesis of long narrow gold nanocrystals and the study of their vibrational dynamics using inelastic light-scattering measurements. Rich experimental spectra are obtained for monodomain gold nanorods and pentagonal twinned bipyramids. Their assignment involves diameter-dependent nontotally symmetric vibrations which are modeled in the framework of continuum elasticity by taking into account simultaneously the size, shape, and crystallinity of the nanocrystals. Light scattering by vibrations with angular momenta larger than 2 is reported. It is shown to increase with the ratio of the nanocrystals diameter to the interparticle separation. It originates from the plasmonic coupling due to the self-assembly of the nanocrystals after deposition.
