Helically twisted chiral arrays of gold nanoparticles coated with a cholesterol mesogen

Cseh, Liliana; Mang, Xiaobin; Zeng, Xiangbing; Liu, Feng; Mehl, Georg; Ungar, Goran; Siligardil, Giuliano

Abstract

© 2015 American Chemical Society. Gold nanoparticles have been prepared and surface-functionalized with a 1:1 molar mixture of a hexylthiol ligand and a chiral mesogenic ligand consisting of a cholesterylbenzoate attached via an undecylthiol spacer. Grazing incidence X-ray diffraction showed that upon annealing a columnar liquid crystal (LC) structure develops with the nanoparticles forming strings on a regular oblique 2d lattice. Synchrotron radiation circular dichroism is substantially enhanced upon the isotropic-LC transition. In the proposed structural model, layers of Au columns rotate by a small angle relative to their neighbors, with the columns winding around a helical axis. The work demonstrates that it is possible to obtain chiral LC superstructures from nanoparticles coated with chiral mesogen without the addition of a separate LC or chiral dopants. The results provide direction in the development of plasmonic metamaterials interacting selectively with circularly polarized light.

Citation

Cseh, L., Mang, X., Zeng, X., Liu, F., Mehl, G., Ungar, G., & Siligardil, G. (2015). Helically twisted chiral arrays of gold nanoparticles coated with a cholesterol mesogen. Journal of the American Chemical Society, 137(40), 12736-12739. https://doi.org/10.1021/jacs.5b05059

• Journal Article Type: Article
• Online Publication Date: Sep 25, 2015
• Publication Date: Oct 14, 2015
• Deposit Date: Oct 28, 2015
• Publicly Available Date: Nov 23, 2017
• Journal: Journal of the American Chemical Society
• Print ISSN: 0002-7863
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 137
• Issue: 40
• Pages: 12736-12739
• DOI: https://doi.org/10.1021/jacs.5b05059
• Keywords: Metal, Nanoparticle, Liquid crystal, Chiral, Helix, Circular dichroism, GISAXS
• Public URL: https://hull-repository.worktribe.com/output/380383
• Publisher URL: http://pubs.acs.org/doi/10.1021/jacs.5b05059
• Additional Information: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of the American Chemical Society, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/jacs.5b05059
• Contract Date: Nov 23, 2017