Fig. 3: Printing of hairlike electrodes and characterization of their stability, electrical and mechanical properties.
From: Stick-and-play bioadhesive hairlike electrodes for chronic EEG recording on human
a Photographs of layer-by-layer printing process of hairlike electrodes with 100 µm nozzle using DIW-based multi-material 3D printing. b Impedance spectra of electrode-skin interface of hairlike electrodes and commercial gold electrodes on wrist. c Impedance spectra of electrode-skin interface of hairlike electrodes and commercial gold electrodes on hairy scalp. d Long-term stability assessment of the hairlike electrodes on a hairy scalp with continuous wearing. Images depict the electrode on the scalp at 0 hours (i), 12 hours (ii), and 24 hours (iii), illustrating its durability over time. e Impedance spectra of the electrode-skin interface for the hairlike device at different time intervals: initially, after 12 hours, and after 24 hours of continuous wear on hairy scalp. f Plots for electrode skin impedance at 10 Hz and 100 Hz after different tensile cycles of hairlike electrodes. (n = 4) Error bars indicate standard deviation. g Engineering stress vs engineering strain curve for a hairlike electrode.
