The Polymer Society of Korea

이대연 (울산과학기술원)

김봉수 (울산과학기술원)

Next-generation bioelectronics require ultrathin, soft interfaces that sustain high OECT performance on wet, moving tissues. We report THIN, a 350-nm transformable adhesive bilayer fabricated via orthogonal solvents (H₂O/CHCl₃) and lifted off as a freestanding nanomembrane. THIN integrates an alginate-catechol hydrogel and a semiconducting polymer P(g2T2-Se). Selenophene substitution enhances strain-insensitive mixed conduction (µC* = 1034 F cm^-1 V^-1 s^-1), 3.5× higher than a thiophene analog). H-NMR, UV-vis, and FT-IR analyses reveal interfacial interactions that stabilize catechol-polymer interface for robust adhesion. Upon hydration, THIN rapidly softens (hardness: 1.35 to 0.035 GPa; bending stiffness: 0.16 to 9.11×10^-5 GPa µm⁴), enabling dry-state handling and conformal contact under wet conditions. THIN-OECTs provide stable in vivo EGM, EMG, and ECoG recordings from rat heart, muscle, and brain with 4-week biocompatibility.