Stretchable and Dry Adhesives for Conformal Epidermal Electrodes
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Conformal contact between epidermis and dry electrodes is crucial for acquiring high-signal multimodal biosignals under various daily activities. Herein, we report stretchable and dry adhesives based on polyphenol and polyol composites. The polyphenol:polyol composites showed the higher stretchability and adhesive force compared to those of each polyphenol and polyol thin film. The enhanced stretchability and adhesive force of the composites were attributed to strengthened hydrogen bonding between polyphenol and polyol molecules. The composite adhesives prepared onto various stretchable and transparent epidermal electrodes including poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thin films afforded conformal contact with human skins in various conditions. Our results demonstrate the importance of strong adhesion at the interface between epidermis and dry electrodes, and will facilitate the development of high-performance wearable epidermal electronics.