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Issue 16, 2020
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Shape-directed self-assembly of nanodumbbells into superstructure polymorphs

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Abstract

Self-assembly of colloidal nanoparticles into ordered superstructures provides a promising route to create novel/enhanced functional materials. Much progress has been made in self-assembly of anisotropic nanoparticles, but the complexity and tunability of superstructures remain restricted by their available geometries. Here we report the controlled packing of nanodumbbells (NDs) with two spherical lobes connected by one rod-like middle bar into varied superstructure polymorphs. When assembled into two-dimensional (2D) monolayer assemblies, such NDs with specific shape parameters could form orientationally ordered degenerate crystals with a 6-fold symmetry, in which these NDs possess no translational order but three allowed orientations with a rotational symmetry of 120 degrees. Detailed analyses identify the distinct roles of subunits in the ND assembly: the spherical lobes direct NDs to closely assemble together into a hexagonal pattern, and the rod-like connection between the lobes endows NDs with this specific orientational order. Such intralayer assembly features are well maintained in the two-layer superstructures of NDs; however, the interlayer stackings could be adjusted to produce stable bilayer superstructures and a series of metastable moiré patterns. Moreover, in addition to horizontal alignment, these NDs could gradually stand up to form tilted or even vertical packing based on the delicate control over the liquid–liquid interface and ND dimensions. This study provides novel insights into creating superstructures by controlling geometric features of nanoscale building blocks and may spur their novel applications.

Graphical abstract: Shape-directed self-assembly of nanodumbbells into superstructure polymorphs

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Supplementary files

Article information


Submitted
31 Jan 2020
Accepted
27 Mar 2020
First published
27 Mar 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020,11, 4065-4073
Article type
Edge Article

Shape-directed self-assembly of nanodumbbells into superstructure polymorphs

Y. Liu, K. Deng, J. Yang, X. Wu, X. Fan, M. Tang and Z. Quan, Chem. Sci., 2020, 11, 4065
DOI: 10.1039/D0SC00592D

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