Figure 1: EMCP synthesis and microstructure characterization.

(a) Schematic of the structural elasticity of the hollow-sphere-structured PPy. (b) Schematic illustration of the interphase synthesis mechanism of PPy hydrogels with hollow-sphere microstructures. (c) Digital photograph of a PPy hydrogel. (d) Typical scanning electron microscope (SEM) image of the PPy thin film, scale bar: 10 μm. (e) Transmission electron microscopy (TEM) image of PPy revealing its interconnected hollow-sphere structure, scale bar: 1 μm.