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Issue 14, 2021
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Thickness control of 2D nanosheets assembled from precise side-chain giant molecules

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Abstract

The performance of 2D nanomaterials hinges on both the chemical compositions and the morphological structures across different length scales. Among all the three dimensions, thickness is the only one that falls into the nanometer scale and, to some extent, determines the intrinsic properties of 2D nanomaterials. In this study, we report the preparation and precise thickness control of 2D nanosheets assembled from a library of monodispersed amphiphilic giant molecules composed of functional polyhedral oligomeric silsesquioxanes (POSSs) as the side groups. Solution self-assembly of such giant molecules resulted in 2D nanosheets with similar structural configurations, where a bilayer of hydrophobic isobutyl POSS (BPOSS) is sandwiched by two monolayers of hydrophilic POSS bearing carboxylic acid groups (APOSS). The thickness of the obtained nanosheets could be tuned through adjusting the chemical compositions of the pendant POSS cages. Intriguingly, we found that the thickness of the 2D nanosheets was not necessarily proportional to the contour length of the giant molecule nor the total number of POSS cages tethered to the main chain. Indeed, the number ratio of BPOSS to APOSS, rather than the exact number, played a deterministic role in the thickness control. To explain the unusual thickness dependence, we built up a structure model with an in-plane orientation of the giant molecules in the nanosheets, from which a formula was further deduced to semi-quantitatively describe the inverse relationship between the overall thickness and the number ratio of BPOSS to APOSS.

Graphical abstract: Thickness control of 2D nanosheets assembled from precise side-chain giant molecules

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Supplementary files

Article information


Submitted
03 Jan 2021
Accepted
25 Feb 2021
First published
26 Feb 2021

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

Chem. Sci., 2021,12, 5216-5223
Article type
Edge Article

Thickness control of 2D nanosheets assembled from precise side-chain giant molecules

F. Feng, D. Guo, Y. Shao, X. Yan, K. Yue, Z. Pan, X. Li, D. Xiao, L. Jin, W. Zhang and H. Liu, Chem. Sci., 2021, 12, 5216 DOI: 10.1039/D1SC00021G

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