Enhancing Conductivity and Self-Healing in PEDOT:PSS/Poly(ionic liquid) Elastomers for Sensor Applications

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) combined with a poly(ionic liquid) (PIL) represents a promising class of elastomeric composites with unique properties suitable for diverse applications. In this study, we investigate the conductivity enhancement and ion migration capabilities of PEDOT:PSS/PIL elastomers, particularly through post-treatment with lithium bis(trifluoromethanesulfonyl)imide (Li:TFSI) aqueous solutions. The ion migration significantly improves the conductivity, making these materials ideal for electronic devices and sensors. Moreover, the PEDOT:PSS/PIL elastomers exhibit self-healing capabilities, as evidenced by their ability to recover the conductivity and structural integrity after mechanical deformation. Rheological studies reveal the role of compression-induced viscosity in facilitating the self-healing processes. The adhesive strengths of the PEDOT:PSS/PIL elastomers on glass substrates are also explored, highlighting their potential for robust material–substrate bonding. Additionally, these elastomers demonstrate effectiveness in stress-sensing devices, showing reliable responses to varying pressure levels for applications in human motion detection and sensor technologies. Overall, the PEDOT:PSS/PIL elastomers offer a versatile platform with enhanced conductivity, self-healing properties, strong adhesion, and responsiveness to mechanical stress, paving the way for advancements in flexible electronics, smart devices, and beyond.