Abstract
In recent years, skin-like ionic sensors have attracted considerable attention due to their excellent performance, feasibility, and biocompatibility. However, developing a multifunctional, stable, durable, highly sensitive skinlike ionic sensor is a challenge. Herein, a composite ionogel with good durability, environmental tolerance (freezing and vacuum resistance), ionic conductivity, self-healing capability, high adhesion and stretchability was fabricated via a simple UV initiated polymerization. The ionogel could be easily assembled into strain, pressure, and temperature sensors for detecting changes in the external environment. In strain and pressure sensing tests, the ionogel-based sensor exhibited high sensitivity (gauge factor GF = 14.7), a wide response range (1%–1600%), rapid response time (95.8 ms), high stability, and repeatability (50% for 1000 cycles). Therefore, it could trace not only wide joint movements but also subtle changes in facial expressions (frowning). The sensor could also be assembled into a knock sensor and a high-precision touch pad sensor for message transmission. The ionogel-based sensor exhibited high sensitivity to temperature variations from 0 to 120°C and a low detection threshold (0.1°C). Thus, the proposed ionogel-based sensor has enormous potential in multifunctional electronic and sensory device applications.
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