The flexible strain sensors have potential applications in advanced electronics, health monitoring systems, wearable sensors, robotics, and human-machine interfaces. The development of highly sensitive, stretchable, and durable strain sensors is a challenging task for researchers. However, the sensors with a detection range from large strain to minute deflection are imperative for human-interactive applications. This work has demonstrated a facile method of sensor fabrication, which use reduced graphene oxide (rGO) as sensing material and silicone sealant as a flexible substrate. Few-layer rGO is synthesized by electrochemical exfoliation of pencil lead. The fabricated sensors have a gauge factor higher than 4000 and durability longer than 1600 cycles at 100% strain. At the same time, developed strain sensors exhibit detection capability over a wide range of strain (0-120%), which is an essential requirement of wearable sensors. To the best of the authors' knowledge, fewer works have reported strain sensors that have ultra-high gauge factor (≥4000) in combination with high stretchability (>100%). Utilizing the ultra-sensitivity and sub-second response time of the rGO-sealants, these wearable sensors are used to monitor physical activities, heartbeats, and finger touches.

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