“…By combining with hydrogen-bond interactions, they could cause the partially ordered one-dimensional stacking of pyrene rings and further induce the formation of the corrugations in HO-GNs. Given the contour length of a pyrene ring containing a MDI molecule and a PEG oligomer molecule ($3.6 nm), 60,61 the formed corrugations are expected to consist of one or two rows of closely stacked pyrene ring aggregates. However, owing to the inherent disorder feature of GNs, the propagation of these pyrene aggregates along some direction could be interrupted or deflected so that some curved corrugations can be observed.…”