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Self-assembly of Gold Nanoparticles into an Adjustable Plasmonic 3D Lattice using Janus-type Forked Mesogenic Ligands

Zhao, Yang yang; Cao, Yu; Siligardi, Giuliano; Mehl, Georg H.; Liu, Feng; Ungar, Goran

Authors

Yang yang Zhao

Yu Cao

Giuliano Siligardi

Feng Liu

Goran Ungar



Abstract

We report the formation of a 3D body-centred self-assembled superlattice of gold nanoparticles whose interparticle gap, and hence its plasmonic properties, are adjustable exclusively in the xy-plane. Thus, even though the particles are spherical, their anisotropic packing generates tailorable plasmonic dichroism. The gold nanoparticles are coated with forked ligands containing two mesogens: either two cholesterols (“twin”), one cholesterol and one azobenzene (“Janus”), or a mixture of the two. Beside the body-centered arrangement of gold nanoparticles, the structure also contains unusual two-dimensionally x-y dual undulated (eggbox-like) smectic-like layers of mesogens. Moreover, the presence of azobenzene mesogens allows the superlattice to be melted through UV-induced photo-isomerization; the process is reversible displaying low fatigue on repeated cycling.

Citation

Zhao, Y. Y., Cao, Y., Siligardi, G., Mehl, G. H., Liu, F., & Ungar, G. (2022). Self-assembly of Gold Nanoparticles into an Adjustable Plasmonic 3D Lattice using Janus-type Forked Mesogenic Ligands. Chemistry - An Asian Journal, Article e202200057. https://doi.org/10.1002/asia.202200057

Journal Article Type Article
Acceptance Date Feb 3, 2022
Online Publication Date Mar 22, 2022
Publication Date Mar 4, 2022
Deposit Date Mar 15, 2022
Publicly Available Date Mar 5, 2023
Journal Chemistry - An Asian Journal
Print ISSN 1861-4728
Electronic ISSN 1861-471X
Publisher Wiley
Peer Reviewed Peer Reviewed
Article Number e202200057
DOI https://doi.org/10.1002/asia.202200057
Keywords Gold; Nanoparticles; Liquid crystal; Plasmonic resonance; Photoisomerization
Public URL https://hull-repository.worktribe.com/output/3949609