Figure 4.

Fabricating process and microstructure of modified multiple-layer graphene oxide (MLGO) paper. (a) Schematic preparation of MPMS/LAA comodified GO (MLGO) paper. (b) Typical digital photograph of MLGO paper showing good mechanical flexibility. (c–e) Surface and cross-sectional SEM images of MLGO (10/40) paper. Some needle-like structures are observed on the paper surface, and the GO sheets are well aligned. (f–i) Typical SEM image and surface element distribution of MLGO (10/40) paper. Reprinted with permission from Ref. [72] Copyright 2020 Elsevier.