科研之友
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摘要
Recently, flexible wearable electronics have drawn increasing interest in health monitoring, human motion detection, artificial skin, and so on, owing to their comfort of wear and their ability to transmit real-time information. However, they generally show poor stretchability, low sensitivity, and single sensory function, which limit their practical applications. Herein, a series of conductive hydrogels (CT-K hydrogels) are developed using the CT complex of a viologen derivative and pyranine derivative (MS-CT complex) as the crosslinker. Their mechanical properties were highly tunable by adding different concentrations of KCl, reaching a maximum fracture strain of 1044%. Their ionic structure endowed them with an excellent conductivity of up to 6.75 S m(-1). These hydrogels were fabricated as multifunctional sensors capable of detecting both strain and temperature with high sensitivity (gauge factor up to 8.71 and temperature coefficients of resistance up to -3.20% degrees C-1), a wide sensing range (900% strain and 5-70 degrees C) and reliable stability. Benefiting from the thermosensitivity and reversible interaction of the MS-CT complex, CT-K hydrogels had thermoplastic properties, and their sensing performance remained good after thermal treatment, demonstrating that the CT-K hydrogel-based sensors were recyclable and adaptable. This work paves the way for the development of high-performance hydrogel sensors using CT complexes, and promotes the versatile electronic applications of hydrogel sensors.
