Description:
Developing wearable strain sensors with zero temperature coefficient of resistance (TCR), which is crucial to overcome the problem of temperature disturbance, has been scarcely studied. Herein, highly stretchable graphene nanoplatelet (GNP)/carbon nanotube (CNT)/silicone elastomer (GCE) fibers are successfully prepared via a facile direct ink writing technique. The GCE fibers fabricated are consisted of CNTs and GNPs having negative temperature coefficient (NTC) and positive temperature coefficient (PTC), respectively. As a result, the obtained GCE fiber by adjusting the mass ratio of CNTs and GNPs shows a near-zero TCR (1.14×10 -4 /°C), which is the lowest one compared with the reported values in the literature. Besides, the GCE strain sensor exhibits the highest sensitivity (gauge factor (GF) =14550.2 for 100% strain) compared with the data reported previously, and a wide working range (1 to 100%), a low detecting limit (1% strain), a quick response time (170 ms) and a high durability (after 10000 loops). In addition, the GCE strain sensor shows an excellent electrical stability under external conditions including longstanding storage and humidity/water exposure. Finally, various human movements are detected under water and high temperature conditions to demonstrate the outstanding sensing performance and response stability of the GCE strain sensor