Bao Fandou, Ni Fengyao, Zhai Qianqian, Sun Zhizhuang, Song Xiaolin, Lin Yu
School of Physics and Electronic Engineering, Jining University, Qufu 273155, China.
Shandong Donghong Pipe Industry Co., Ltd., Qufu 273155, China.
Polymers (Basel). 2024 Dec 5;16(23):3426. doi: 10.3390/polym16233426.
Flexible sensing materials have become a hot topic due to their sensitive electrical response to external force or temperature and their promising applications in flexible wear and human-machine interaction. In this study, a PDMS/capillary GaInSn flexible sensing material with high force and thermal sensitivity was prepared utilizing liquid metal (LM, GaInSn), flexible silicone capillary, and polydimethylsiloxane (PDMS). The resistance () of the flexible sensing materials under the action of different forces and temperatures was recorded in real-time. The electrical performance results confirmed that the of the sensing material was responsive to temperature changes and increased with the increasing temperature, indicating its ability to transmit temperature signals into electrical signals. The was also sensitive to the external force, such as cyclic stretching, cyclic compression, cyclic bending, impact and rolling. The Δ/ changed periodically and stably with the cyclic stretching, cyclic compression and cyclic bending when the conductive pathway diameter was 0.5-1.0 mm, the cyclic tensile strain ≤ 20%, the cyclic tensile rate ≤ 2.0 mm/min, the compression ratio ≤ 0.5, and the relative bending curvature ≤ 0.16. Moreover, the material exhibited sensitivity in detecting biological signals, such as the joint movements of the finger, wrist, elbow and the stand up-crouch motion. In conclusion, this work provides a method for preparing a sensing material with the capillary structure, which was confirmed to be sensitive to force and heat, and it produced different types of signals under different deformations and different temperatures.
柔性传感材料因其对外力或温度的敏感电响应以及在柔性穿戴和人机交互方面的广阔应用前景而成为热门话题。在本研究中，利用液态金属（LM，GaInSn）、柔性硅毛细管和聚二甲基硅氧烷（PDMS）制备了一种具有高力敏和热敏性的PDMS/毛细管GaInSn柔性传感材料。实时记录了柔性传感材料在不同力和温度作用下的电阻（）。电学性能结果证实，传感材料的对温度变化有响应，且随温度升高而增加，表明其能够将温度信号转换为电信号。对诸如循环拉伸、循环压缩、循环弯曲、冲击和滚动等外力也很敏感。当导电通路直径为0.5 - 1.0 mm、循环拉伸应变≤20%、循环拉伸速率≤2.0 mm/min、压缩比≤0.5且相对弯曲曲率≤0.16时，Δ/随循环拉伸、循环压缩和循环弯曲周期性且稳定地变化。此外，该材料在检测生物信号方面表现出敏感性，如手指、手腕、肘部的关节运动以及起立 - 蹲下运动。总之，这项工作提供了一种制备具有毛细管结构传感材料的方法，该材料被证实对力和热敏感，并且在不同变形和不同温度下产生不同类型的信号。
