Jump to main content
Jump to site search

Issue 10, 2020

Symmetry breaking of Au nanospheres confined in 1D nanocylinders: exploring helical assembly by 3D transmission electron microscopy

Author affiliations

Abstract

A chiral plasmonic nanoparticle (NP) superstructure can serve as a promising scaffold for chirooptical sensors, circular polarizers, and optical metamaterials. The helical architecture, a representative NP assembly, can enhance optical chirality, guided by a symmetry breaking of NPs closely packed in a confined geometry within a cylindrical domain. Herein, we report the helical and zigzag assemblies of polystyrene (PS)-tethered Au NPs confined in cylindrical nanochannels produced using an anodic aluminum oxide (AAO) template. The number of NP layers and the NP packing structures were controlled by the molecular weight of PS (Mn-PS), affecting the surface plasmon resonance characteristics of the hybrid assemblies. The decrease in Mn-PS of NPs showed a strong tendency to form multi-layered, multi-stranded helical arrays rather than a two-layered zigzag array, which closely agrees with previously reported predictions by computational studies. These highly complex hybrid nanoassemblies were elaborated by three-dimensional (3D) transmission electron microscopy (TEM). Even when the resultant assemblies were obtained from the same AAO nanochannel, it was difficult to describe the internal NP arrangements using a conventional TEM since different superstructures were observed depending on the viewing angle of the assemblies. However, representative 3D tomograms reconstructed by a series of two-dimensional projections of the hybrid nanoassemblies indicated that all different packing structures observed by TEM result from the specific assemblies with the same NP configuration. This study presents a useful strategy for providing helical assembly and controlling the plasmonic optical activities of Au NPs and reducing scientific errors originating from a lack of accurate analysis and predication in identifying the relationship between nanostructures and their unique functions.

Graphical abstract: Symmetry breaking of Au nanospheres confined in 1D nanocylinders: exploring helical assembly by 3D transmission electron microscopy

Supplementary files

Article information


Submitted
03 Jun 2020
Accepted
01 Aug 2020
First published
03 Aug 2020

Mater. Chem. Front., 2020,4, 3032-3039
Article type
Research Article

Symmetry breaking of Au nanospheres confined in 1D nanocylinders: exploring helical assembly by 3D transmission electron microscopy

S. Jin, J. H. Hwang, K. Wang, J. Xu, I. Kim, J. Zhu and E. Lee, Mater. Chem. Front., 2020, 4, 3032 DOI: 10.1039/D0QM00374C

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Social activity

Search articles by author

Spotlight

Advertisements