Ligand-induced incompatible curvatures control ultrathin nanoplatelet polymorphism and chirality - Archive ouverte HAL Access content directly
Journal Articles Proceedings of the National Academy of Sciences of the United States of America Year : 2024

Ligand-induced incompatible curvatures control ultrathin nanoplatelet polymorphism and chirality

Debora Monego
Sarit Dutta
  • Function : Author
Doron Grossman
Marion Krapez
  • Function : Author
Pierre Bauer
  • Function : Author
Benoit Mahler
Asaph Widmer-Cooper
  • Function : Author
Benjamin Abécassis

Abstract

The ability of thin materials to shape-shift is a common occurrence that leads to dynamic pattern formation and function in natural and man-made structures. However, harnessing this concept to rationally design inorganic structures at the nanoscale has remained far from reach due to a lack of fundamental understanding of the essential physical components. Here, we show that the interaction between organic ligands and the nanocrystal surface is responsible for the full range of chiral shapes seen in colloidal nanoplatelets. The adsorption of ligands results in incompatible curvatures on the top and bottom surfaces of the NPL, causing them to deform into helicoïds, helical ribbons, or tubes depending on the lateral dimensions and crystallographic orientation of the NPL. We demonstrate that nanoplatelets belong to the broad class of geometrically frustrated assemblies and exhibit one of their hallmark features: a transition between helicoïds and helical ribbons at a critical width. The effective curvature κ ¯ is the single aggregate parameter that encodes the details of the ligand/surface interaction, determining the nanoplatelets’ geometry for a given width and crystallographic orientation. The conceptual framework described here will aid the rational design of dynamic, chiral nanostructures with high fundamental and practical relevance.

Dates and versions

hal-04562464 , version 1 (29-04-2024)

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Debora Monego, Sarit Dutta, Doron Grossman, Marion Krapez, Pierre Bauer, et al.. Ligand-induced incompatible curvatures control ultrathin nanoplatelet polymorphism and chirality. Proceedings of the National Academy of Sciences of the United States of America, 2024, 121 (9), ⟨10.1073/pnas.2316299121⟩. ⟨hal-04562464⟩
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