Ten-Hour Stable Noninvasive Brain-Computer Interface Realized by Semidry Hydrogel-Based Electrodes
(a) Semidry electrode and hollow screw structure shell. Photographs of the mechanical stability test setup under (b) compression and (c) release. The scale bars in (b) and (c) are 2 cm. (d) Stress-strain curve of the AgPHMS semidry electrode with 5%, 10%, and 15% compression. (e) Linear sweep voltammetry (LSV) results of the AgPHMS semidry electrode for different values of compression. (f) 500 cycles of CV on the AgPHMS semidry electrode. (g) Changes of AgPHMS semidry electrode impedance in 500 compression cycle tests with 5%, 10%, and 15% compression ( for each compression). (h) Perspective of finite element simulation results with 10% compression. Views along the (i) -axis section and (j) -axis section of finite element simulation results with 10% compression.