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Right here, we reveal that scalable creation of monolayer nanosheets may be accomplished by a facile ball-milling exfoliation method because of the support of viscous polyethyleneimine (PEI) liquid. As a demonstration, graphite is effortlessly exfoliated into graphene nanosheets, achieving a top monolayer percentage of 97.9per cent at a yield of 78.3per cent. The universality of this method can be proven by effectively exfoliating other types of representative layered products with va