Stable and low-resistance polydopamine methacrylamide-polyacrylamide hydrogel for brain-computer interface

Signal drift and performance instability of brain-computer interface devices induced by the failure between rigid metal electrodes soft human skin hinder precise data acquisition electroencephalogram (EEG). Thus, it is desirable to achieve a robust for devices. Here, kind polydopamine methacrylamide-polyacrylamide (PDMA-PAAM) hydrogel developed. To improve adhesion, dopamine introduced into polyacrylamide hydrogel, through amino catechol groups in an organic-inorganic build covalent non-covalent interaction. A strong attachment effective modulus transition system can be formed skin, so that peeling force PDMA-PAAM porcine reach 22 N m?1. In addition, stable conductivity long-term operating life more than 60 days at room temperature are achieved adding sodium chloride (NaCl) glycerol, respectively. The membrane fabricated this work integrated onto flexible Au electrode applied interface. comparison, collected EEG signal intensity waveform consistent with commercial counterparts. And obviously, demonstrated enable user-friendly