Xue Longwei, Yuan Li, Zhou Jixing, Dai Junshuai, Zhang Xudong, Hu Hong, Liu Hai, Zhao Tingting
Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, Shanghai, 200072, China.
The School of Microelectronics, Shanghai University, Shanghai, 201800, China.
Nanoscale. 2025 Jun 26;17(25):15366-15374. doi: 10.1039/d5nr00660k.
Electronic skins that emulate the tactile functionality of the human skin are crucial for robotic applications. The sensitivity and pressure-sensing range of current humanoid tactile sensors have made significant advancements. However, the temperature susceptibility of conductive materials and the rapid saturation of conductive contact sites in soft polymeric materials pose challenges for these sensors, including environmental interference and a narrow linear sensing range. These issues often lead to inconsistencies between the sensing signal and contact behavior, which subsequently reduce the accuracy and reliability. Herein, we proposed a flexible piezoresistive pressure sensor with a minimized response to temperature variation and an extended linear sensing range. The sensor utilized a novel hybrid conductive material created by combining materials with opposite temperature coefficients, resulting in a zero-temperature resistance coefficient. Accordingly, a reliable operation ranging from 20-70 °C with temperature-variation-induced fluctuation-free performance was achieved. Additionally, the sensor exhibited a biomimetic polymer microstructure with multilevel cone-dome structural features, resulting in an ultra-wide linear pressure-sensing range of 0-200 kPa. Based on the simple and scalable fabrication process, a high-density sensor array (16 × 16) was produced to accurately outline the spatial pressure distributions, even under external temperature interference, and successfully discern the texture of the contact object.
模拟人类皮肤触觉功能的电子皮肤对机器人应用至关重要。当前类人触觉传感器的灵敏度和压力传感范围已取得显著进展。然而，导电材料的温度敏感性以及软质聚合物材料中导电接触部位的快速饱和对这些传感器构成了挑战，包括环境干扰和线性传感范围狭窄。这些问题常常导致传感信号与接触行为之间的不一致，进而降低了准确性和可靠性。在此，我们提出了一种对温度变化响应最小且线性传感范围得以扩展的柔性压阻式压力传感器。该传感器采用了一种新型混合导电材料，通过将具有相反温度系数的材料结合而成，从而实现了零温度电阻系数。因此，实现了在20至70°C范围内可靠运行，且温度变化引起的性能无波动。此外，该传感器呈现出具有多级锥顶结构特征的仿生聚合物微观结构，从而实现了0至200 kPa的超宽线性压力传感范围。基于简单且可扩展的制造工艺，制作了一个高密度传感器阵列（16×16），即使在外部温度干扰下也能准确勾勒出空间压力分布，并成功辨别接触物体的纹理。
