Abstract
AbstractRecent years have witnessed the rise of an emerging class of synthetic two‐dimensional (2D) materials‐2D polymers. The combination of organic chemistry and rational design of polymeric crystals has stimulated tremendous research efforts in the controlled synthesis of 2D polymers. However, despite the advancement in synthetic methodologies, the structural characterization of 2D polymers remains a significant challenge. Although aberration‐corrected high‐resolution transmission electron microscopy (AC‐HRTEM) is capable of direct imaging of atomic structures with sub‐Ångström resolution, electron radiation damage poses a substantial limit on the achievable image resolution due to instant decomposition of the molecular framework. In this Perspective, we will briefly discuss radiation damage mitigation strategies, which may eventually result in AC‐HRTEM imaging of 2D polymers down to the atomic scale.
Highlights
The main difficulty originates from electron radiation damage.[25,26] During TEM imaging, the incident electrons transfer kinetic energy to atoms of the molecules
For 2D polymers and COFs, the exceedingly high proneness towards electron radiation renders in Depending on whether the electron beam interacts with the valence electrons of the atoms or atomic nuclei, radiation damage in TEM can be categorized into two groups.[26]
The efficacy of deuteration will still rely on the absolute critical dose, we believe that using deuterated monomers would be a road worth perusing when synthesizing 2D polymers and COFs
Summary
The main difficulty originates from electron radiation damage.[25,26] During TEM imaging, the incident electrons transfer kinetic energy to atoms of the molecules. Liquid‐cell TEM has been applied to reveal the reaction dynamics in situ, offering significant insights into the formation mechanisms of materials, for example, nucleation and growth of nanoparticles, assembly of inorganic and organic matters, biomineralization.[36,37] Notably, recent advancements and implementation of graphene liquid cells have brought liquid‐cell TEM into an atomic‐resolution era.[38] for 2D polymers and COFs, the exceedingly high proneness towards electron radiation renders in Depending on whether the electron beam interacts with the valence electrons of the atoms or atomic nuclei, radiation damage in TEM can be categorized into two groups.[26]
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