From Anisotropic to Asymmetric Gold Nanocrystals

Datum

24.05.2023

Zeit

11:00 - 12:00

Sprecher

Prof. Luis M. Liz-Marzán

Zugehörigkeit

BiomaGUNE, San Sebastián-Spain

Sprache

en

Hauptthema

Materialien

Host

Ines Firlle

Beschreibung

The field of chirality has seen a strong rejuvenation due to the observation of nanoscale chirality in plasmonic nanoparticles [1,2]. This lecture will highlight recent advances in the field of plasmonic chirality, including novel methods for the synthesis of optically active plasmonic nanomaterials. Although much research in this field has been related to chiral nanostructures formed by the directed self-assembly of gold nanorods on various chiral templates, recent work has demonstrated the possibility of employing the well-known seeded-growth method to endow colloidal nanoparticles with chiral features. A novel approach will be introduced, comprising the self-organization of surfactant micelles into chiral structures on nanoparticle seeds. This simple concept opens a wide range of possibilities, by playing around with the huge variety of chiral co-surfactants, seed morphologies and metal compositions, which have been studied in the context of the seeded-growth of metal nanoparticles. We demonstrate that the addition of chiral co-surfactants leads to supramolecular interactions with CTAC, resulting in chiral helices that can wrap gold nanocrystals and template the seeded growth into chiral features. The resulting chiral nanoparticle colloids display high morphological and optical handedness, which can be tuned through the visible and the near IR. This approach provides a reproducible, simple and scalable method toward the fabrication of nanoparticles with high chiral optical activity [3]. Recent work on seeded growth of chiral Au nanorods has shed light into growth mechanisms and optical responses [4,5].

Links

• Seminars at the IFW

Letztmalig verändert: 24.05.2023, 07:36:50