Atom-by-atom observation of grain boundary migration in graphene

Nano Letters
Simon KuraschUte Kaiser

Abstract

Grain boundary (GB) migration in polycrystalline solids is a materials science manifestation of survival of the fittest, with adjacent grains competing to add atoms to their outer surfaces at each other's expense. This process is thermodynamically favored when it lowers the total GB area in the sample, thereby reducing the excess free energy contributed by the boundaries. In this picture, a curved boundary is expected to migrate toward its center of curvature with a velocity proportional to the local radius of boundary curvature (R). Investigating the underlying mechanism of boundary migration in a 3D material, however, has been reserved for computer simulation or analytical theory, as capturing the dynamics of individual atoms in the core region of a GB is well beyond the spatial and temporal resolution limits of current characterization techniques. Here, we similarly overcome the conventional experimental limits by investigating a 2D material, polycrystalline graphene, in an aberration-corrected transmission electron microscope, exploiting the energy of the imaging electrons to stimulate individual bond rotations in the GB core region. The resulting morphological changes are followed in situ, atom-by-atom, revealing configura...Continue Reading

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Citations

May 31, 2014·Nature Communications·Jani KotakoskiJannik C Meyer
Feb 25, 2014·Nanoscale·Brian J SchultzSarbajit Banerjee
May 6, 2014·Nanoscale·Lili LiuFeng Ding
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Feb 29, 2020·Advanced Materials·Qiaoli ChenYihan Zhu

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