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Hydrogen-Assisted Fast Growth of Large Graphene Grains by Recrystallization of Nanograins

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journal contribution
posted on 02.12.2020, 06:13 by Hyunjong Lee, Jinwook Baek, Kyun Seong Dae, Seokwoo Jeon, Jong Min Yuk
Chemical vapor deposition has been highlighted as a promising tool for facile graphene growth in a large area. However, grain boundaries impose detrimental effects on the mechanical strength or electrical mobility of graphene. Here, we demonstrate that high-pressure hydrogen treatment in the preannealing step plays a key role in fast and large grain growth and leads to the successful synthesis of large grain graphene in 10 s. Large single grains with a maximum size of ∼160 μm grow by recrystallization of nanograins, but ∼1% areal coverage of nanograins remains with 28–30° misorientation angles. Our findings will provide insights into mass production of high-quality graphene.