Thermally Triggerable and Electrically Conductive Bioadhesives for Detachable Skin-interfaced Electronics
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While strong bioadhesives are vital for secure contact in wearable healthcare devices, their removal or repositioning can cause irritation and skin damage, making conventional adhesives unsuitable for stable skin-interfaced electronics. Here, we have developed a thermally triggerable bioadhesive (TTB) that enables both strong adhesion and gentle detachment, with a drastic change in adhesion energy of 350%. The TTB maintains a stable bond for over a week, even under strenuous exercise, and detaches rapidly at a programmed temperature by transitioning to a hydrophobic state, which releases water and disrupts ionic bonds at the interface. Its conformal contact and ionic properties allow for precise biosignal acquisition with a high signal-to-noise ratio. These findings offer an appealing approach to electronic bioadhesives that minimize the risk of skin injury, thereby improving the functionality and safety of wearable and on-skin electronics.