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Strain sensors based on conductive elastomers face challenges like baseline drift and noise due to inherent viscoelasticity and weak electrode interfaces under dynamic strains. Herein, a synergistic structure with biphasic hierarchical networks and stable electrode interfaces is proposed to address these issues. The sensor employs a multilayer structure with polydimethylsiloxane (PDMS) substrate, carbon nanotube-doped PDMS (CNT-PDMS), and Ag film. Electrodes are fixed using a rigid island reinforced mortise and tenon joint formed with PDMS and CNT-PDMS. The Ag film dominates resistance during release, significantly reducing baseline drift. Strain-insensitive electrode interfaces further reduce baseline drift and noise. This optimized design ensures 99.999% resistance recovery without delay, even at high-speed (800 mm/min) and large (80%) strains. The sensor exhibits a high gauge factor of 55442, low detection limit (0.02%), and excellent stability (5000 cycles). With the designed algorithms, the single-channel sensor achieves 98.2% decoding accuracy for various gestures, demonstrating great potential for wearable electronics.
Yuan et al. (Mon,) studied this question.