The present study investigates the piezoresistive properties of polycrystalline MoS film for strain-sensing applications. The gauge factor (GF) of the flexible MoS device (MoS/PET) has been calculated to be 102 ± 5 in the stress range from ~7 MPa to ~14 MPa. In addition, to improve the sensing stress range, the flexible strain sensors are encapsulated by SU-8. The effect of encapsulation layer thickness is reflected in the GF, which is attributed to the shifting of the neutral axis. However, the calculated GF is constant in the higher stress range, 80 ± 2 and 12 ± 1 for 2 μm and 10 μm thick SU-8, respectively. Herein, we report a cost-effective and scalable approach to fabricate large-area polycrystalline MoS-based flexible sensors for a wider stress range. The encapsulated devices remained undistorted and intact for stress values beyond 14 MPa. Further, we demonstrate the durability of the fabricated sensors with body movements, such as hand gestures, for all the three types of strain sensor.
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