Flexible Dual-Function Pressure–Temperature Sensor With Negative Poisson’s Ratio Effect Based on Biomimetic Cheliped Structure With High Sensitivity and Fast Response

In this study, a highly sensitive and fast-response multifunctional sensor was designed and fabricated, which has application potential for human–machine interaction. Inspired by chelated structures, this study utilizes 3-D printing technology to create a dielectric layer with a negative Poisson’s ratio (NPR) effect, with a flexible substrate made from temperature-sensitive materials, achieving the function of temperature signal sensing. This article discusses in detail the fabrication process, structural parameters, sensing mechanisms, pressure, and temperature-sensing performance of the flexible dual-functional pressure–temperature sensor (FDPTS). Compared with traditional dielectric structures, the structure design of the dielectric layer is facile, and FDPTS offers a wider pressure sensing range of 0–642 kPa with a sensitivity of up to 2.13 kPa ${}^{-{1}}$ in the 0–10-kPa range, and fast pressure measurement response/recovery times (25 and 25 ms). The integration of graphene (GR) and polyaniline (PANI) into the temperature-sensitive layer exhibits good temperature sensitivity and stability, with a temperature sensitivity of FDPTS reaching 9.55% $\cdot ^{\circ }$ C ${}^{-{1}}$ , allowing for accurate temperature signal sensing. Whether used as a single sensor or in a sensor array, FDPTS has good response characteristics to temperature and pressure signals with well decoupling capabilities. The sensor shows great application prospects in information transmission and interaction.