Fig. 2.

Characterizations of G@HMCN. a, b SEM images and c, d TEM images of G@HMCN; e, f Optical images, and g–i cross-section SEM images of the flexible G@HMCN paper; j N₂ sorption isotherm, k pore-size distribution, l XPS spectrum, and m N 1s XPS spectrum of G@HMCN Inset of a: optical image of the G@HMCN aqueous dispersion. Scale bars, 2 μm a; 50 nm b; 100 nm c; 50 nm d; 1 cm e; 5 μm g; 500 nm h; 100 nm i