Fig. 1. (a) Schematic representation of an unreconstructed monovacancy in the graphene lattice. (b) Vacant sites created in the graphene sheet from the dissolution of carbon atoms into the metal due to annealing. The metal is one that allows for chemisorption at the interface. (c) Ni electrodes deposited on top of the previous structure, which contains etched pits from annealing the previous Ni-graphene device. (Part a reprinted with permission from 38, copyright © 2017 Royal Society of Chemistry. Part b reprinted (adapted) with permission from 44, copyright © 2017 American Chemical Society. Part c reprinted (adapted) with permission from 45, copyright © 2017 American Chemical Society.)
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