fig3

Figure 3. Self-adhesive dry electrodes. (A) Preparation flow chart of the electrode based on PEDOT:PSS (the illustration in the lower right corner is its physical picture)^[28]. Reprinted with permission. Copyright 2020, Springer Nature. (B) Preparation diagram of the highly sweat-resistant dry electrode and photos of its stretch/compression at the wrist^[29]. Reprinted with permission. Copyright 2022, American Chemical Society. (C) Formation diagram of the environment-friendly dry electrode and its photos showing various characteristics^[30]. Reprinted with permission. Copyright 2022, Wiley-VCH. (D) Explanatory diagram of the interface adhesion mechanism of the electrodes based on LM-doped elastomers and its SEM image (the illustration in the upper right corner is a sample picture)^[37]. Reprinted with permission. Copyright 2022, Wiley-VCH. (E) Pictures of PPy and SF before and after interfacial polymerization and a sample picture of the electrode based on this interface interlocking structure^[40]. Reprinted with permission. Copyright 2020, American Chemical Society. (F) Structure diagram of the electrode with a three-layer structure and its contact pictures with the skin under different conditions^[41]. Reprinted with permission. Copyright 2022, Elsevier. LM: Liquid metal; PEDOT:PSS: poly (3, 4-ethylenedioxythiophene): poly (styrene sulfonate); PPy: polypyrrole; SF: silk fibroins.