Supramolecular architectures of molecularly thin yet robust free-standing layers

Science Advances
Mina MoradiPatrick Shahgaldian

Abstract

Stable, single-nanometer thin, and free-standing two-dimensional layers with controlled molecular architectures are desired for several applications ranging from (opto-)electronic devices to nanoparticle and single-biomolecule characterization. It is, however, challenging to construct these stable single molecular layers via self-assembly, as the cohesion of those systems is ensured only by in-plane bonds. We herein demonstrate that relatively weak noncovalent bonds of limited directionality such as dipole-dipole (-CN⋅⋅⋅NC-) interactions act in a synergistic fashion to stabilize crystalline monomolecular layers of tetrafunctional calixarenes. The monolayers produced, demonstrated to be free-standing, display a well-defined atomic structure on the single-nanometer scale and are robust under a wide range of conditions including photon and electron radiation. This work opens up new avenues for the fabrication of robust, single-component, and free-standing layers via bottom-up self-assembly.

References

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Citations

Jan 20, 2021·Chemical Reviews·Thomas BuhseJean-Claude Micheau
Mar 17, 2021·The Journal of Physical Chemistry. B·Mina MoradiPatrick Shahgaldian

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Methods Mentioned

BETA
x-ray diffraction
Brewster angle microscopy
x-ray photoelectron spectroscopy
X-ray
linear dichroism
AFM
electron diffraction
X
-ray

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