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We report in situ studies on the shrinkage and expansion of graphene nanopores under electron beam irradiation at temperatures of 400–1200°C using a thermal specimen holder in a transmission electron microscope. The shrinkage of nanopores of various sizes is observed. At all temperatures studied in the present work, nanopores with relatively small diameters could be fully closed. And at the low end...
The microstructure of natural graphite (NG) and highly ordered pyrolytic graphite (HOPG) blocks, and their mechanically exfoliated graphenes, prepared by only one stamping on a meshed Cu grid, was investigated using dual beam scanning electron microscope/focus ion beam (SEM/FIB) and transmission electron microscopy (TEM). Channeling contrast enhanced SEM/FIB images and cross section TEM micrographs...
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