Graphene-based wearable piezoresistive sensors are considered promising flexible sensors due to their simple preparation process, convenient signal acquisition, and controllable working range. However, existing flexible graphene pressure sensors face issues such as poor wear resistance, low sensitivity, and a narrow pressure measurement range. In this study, we compare and analyze the influence of the lateral size of graphene on the performance of the device and report a piezoresistive sensor based on PDMS / LGO \(_E\) @PET with high sensitivity and a wide pressure measurement range. The use of large-sized graphene improves the conductivity of the fabric, and the external electric field induces the graphene to enhance its pore structure, further improving conductivity. Finally, a gradient coating film with a hard upper layer and a soft lower layer was obtained through plasma crosslinking, which improved the hydrophobic stability of the device. Experiments show that the sensor has a wide pressure measurement range (0-40 kPa), a high sensitivity range (70.46±5.72 kPa \(^{-1}\) ), and good repeatability and hydrophobicity (static contact angle of 155.9 \(^{\circ }\) ). Moreover, the sensor is not only applicable for wearable detection of physiological signals in the human body but also utilizes a \(3 \times 3\) sensor array to detect the pressure distribution of objects of different shapes, demonstrating its application value in the field of underwater wearables and artificial electronic skin.
