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

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

Authors

Georg H. Mehl

Liliana Cseh

Xiaobin Mang

Xiangbing Zeng

Feng Liu

Giuliano Siligardi

Goran Ungar

Giuliano Siligardil



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.

Journal Article Type Article
Publication Date Oct 14, 2015
Journal Journal of the American Chemical Society
Print ISSN 0002-7863
Electronic ISSN 1520-5126
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 137
Issue 40
Pages 12736-12739
Institution 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
DOI https://doi.org/10.1021/jacs.5b05059
Keywords Metal, Nanoparticle, Liquid crystal, Chiral, Helix, Circular dichroism, GISAXS
Publisher URL http://pubs.acs.org/doi/10.1021/jacs.5b05059
Copyright Statement ©2016 University of Hull
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

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