Highly Sensitive and Reliable Strain Sensor Based on MoS2-Decorated Laser-Scribed Graphene for Wearable Electronics

We propose a strategy for the fabrication of a highly sensitive and reliable strain sensor based on MoS ₂ -decorated laser-scribed graphene (MDS-LSG) for flexible and wearable electronics. The laser-thinning of multilayered MoS ₂ coated on commercial polyimide (PI) film using a CO ₂ infrared laser exhibits three-dimensional hierarchical porous graphene network decorated with MoS ₂ enabling superior electrical properties. By exploiting the advantage of high mobility of graphene and strain-dependent property of MoS ₂ , the technique offers a rapid route towards a simple, facile and scalable approach for the fabrication of high-performance strain sensor. As fabricated sensor endows high sensitivity (gauge factor, GF ~290), wide working range, fast response time and stability over 7000 cycles. Finally, we successfully apply the sensor's performance for subtle deformation of the skin (wrist pulse) and various human-motion detections.