Fig. 1.

Fabrication and structural characterization of SBG sheets. (A) GO platelets were assembled into a GO sheet by filtration, and then PCO was infiltrated into the GO sheet and polymerized using UV radiation. Next, the GO-PCO was reduced using HI. Afterward, PSE and AP were successively infiltrated into the sheet, which resulted in their reaction to form PSEAP molecules, which are able to π-bond on rGO layers. (B) Schematic structural model showing possibly resulting edge connection between rGO layers in different platelets within an SBG sheet. SI Appendix, Fig. S3 illustrates 1,4-addition reaction of diacetylene layers on the top of a platelet, which can provide covalent bonding between neighboring platelet surfaces. (C) Photograph of an SBG sheet, showing its flexibility. (D) Low-resolution SEM image of the edge of a fractured SBG sheet. (E) High-resolution SEM image of the area outlined in D. WAXS patterns for an incident beam parallel to the sheet plane and corresponding azimuthal scan profiles for 002 peak for (F) rGO, (G) G-PCO, (H) πBG-V, and (I) SBG-V sheets.