Ionic conductive hydrogels toughened by latex particles for strain sensors
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nic conductive hydrogels toughened by latex particles for strain sensors †
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CHANG JingYu , ZHANG ZhiXin , JIA Fei & GAO GuangHui
Polymeric and Soft Materials Laboratory, School of Chemical Engineering and Advanced Institute of Materials Science, Changchun University of Technology, Changchun 130012, China Received June 22, 2020; accepted July 15, 2020; published online November 11, 2020
Conductive hydrogels have attracted tremendous attention due to their excellent softness and stretchability as wearable strain sensing devices. However, most of hydrogel-based strain sensors suffered from poor self-recoverability and fatigue resistance, resulting in significant decrease of strain sensitivity after recycling. Here, a soft and flexible wearable strain sensor is prepared by using an ionic conductive hydrogel with latex particles as physical cross-linking centers. The dynamic physical cross-linking structure can effectively dissipate energy through disruption and reconstruction of molecular segments, thereby imparting excellent stretchability, self-recoverability and fatigue resistance. In addition, the hydrogel exhibits excellent strain-sensitive resistance changes, which enables it to be assembled as a wearable sensor to monitor human motions. As a result, the hydrogel strain sensor can provide precise feedback for a wide range of human activities, including large-scale joint bending and tiny phonating. Therefore, the tough ionic conductive hydrogel would be widely applied in electronic skin, medical monitoring and artificial intelligence. ionic conductive hydrogel, strain sensor, self-recovery, fatigue resistance Citation:
Chang J Y, Zhang Z X, Jia F, et al. Ionic conductive hydrogels toughened by latex particles for strain sensors. Sci China Tech Sci, 2020, 63, https:// doi.org/10.1007/s11431-020-1695-0
1 Introduction Soft and wearable strain sensors are widely applied in artificial intelligence, bionic skin and medical monitoring [1–4]. In recent years, wearable sensors with a variety of conductive substrates have been successfully manufactured by integrating elastomers with conductive fillers, such as graphene [5,6], metals [7,8], and conductive polymers [9–11]. The above sensors can monitor and convert external stimuli, such as strain, pressure and temperature into recordable electrical signals for human-machine interfaces, health monitoring, soft robots [12–16]. However, their sensitivity and mechanical property are significantly reduced after recycling, which severely limits their application in the field of †These authors contributed equally to this work. *Corresponding authors (email: [email protected]; [email protected])
wearable devices [17]. Ionic conductive hydrogels are flexible, stretchable and biocompatible as ideal candidates for wearable devices [18,19]. Zhou and his co-workers [20] prepared an ionic conductive hydrogel with high conductivity and mechanical strength that could be used to monitor muscle movement. Kong and his co-workers [21] introduced cellulose nanofibers into the polyacr
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