All‐Dry Self‐Adhesive Soft Electrodes with Subsurface Pores for Long‐Term Skin Recording

Abstract Long‐term electrophysiological recording remains challenging, particularly on delicate skin, due to reliance on adhesive backings and conductive gels. Here, a class of all‐dry, self‐adhesive epidermal electrodes is presented by integrating low‐density, octopus‐like microstructures with porous subsurface architectures. This design offers key advantages, including low electrode‐skin impedance, high air permeability, dynamic adhesion to prevent interfacial delamination, and mild adhesion strength for safe‐and‐easy removal. The electrodes enable stable, high‐quality recordings over 24 h, maintaining signal integrity even under repeated skin deformation. Preclinical studies in healthy subjects demonstrate effective electrophysiological monitoring near the wrist and eye for > 24 h, highlighting potential applications in long‐term, non‐invasive monitoring scenarios such as neonatal intensive care unit monitoring, home healthcare, and sleep studies.