Kim Dokyung, Jo Eunhwan, Sim Jaesam
Purpose Built Mobility Group, Korea Institute of Industrial Technology, 2086, Cheomdangwagi-ro 208beon-gil, Buk-gu, Gwangju 61012, Republic of Korea.
Department of Mechanical Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk 39177, Republic of Korea.
ACS Omega. 2024 Nov 13;9(47):47309-47314. doi: 10.1021/acsomega.4c08467. eCollection 2024 Nov 26.
This study presents a conductive-type pressure sensor based on a conductive composite of 1D/2D nanomaterials coated onto a 3D nonconductive polymer structure with various pores. A 3D porous elastomer for the substrate was fabricated by using a sugar template, which led to an increased mechanical deformation range. The sugar template enhanced the surface roughness of the polymer, resulting in an improvement in the adhesion of nanomaterials to the polymer surface. Subsequently, it was functionalized by coating with hybrid nanomaterials of 1D silver nanowires (AgNWs) and 2D reduced graphene oxide (rGO) through a dip-coating process. When pressure is applied, the rGO/AgNWs/ecoflex pressure sensor deforms along the direction of the applied force, causing the conductive multidimensional nanomaterials to come into contact. Consequently, the improved networks between the two nanomaterials expanded the current paths, increasing the current detected through the electrodes attached to the sensor. The rGO/AgNWs/ecoflex pressure sensor, with its porous structure within the flexible ecoflex, demonstrated a high sensitivity (up to 2.29 kPa) over a wide detection range of 0-120 kPa. This enables the monitoring of a wide range of motions, including small pressures such as subtle touch, respiratory vibrations, and drinking, as well as large pressures such as human bodily movements, finger/arm bending, and foot pressure, making it an excellent candidate for applications requiring precise pressure detection.
本研究提出了一种基于一维/二维纳米材料导电复合材料的导电型压力传感器，该复合材料涂覆在具有各种孔隙的三维非导电聚合物结构上。通过使用糖模板制备了用于基底的三维多孔弹性体，这导致机械变形范围增加。糖模板提高了聚合物的表面粗糙度，从而改善了纳米材料与聚合物表面的附着力。随后，通过浸涂工艺用一维银纳米线（AgNWs）和二维还原氧化石墨烯（rGO）的混合纳米材料进行涂覆，使其功能化。当施加压力时，rGO/AgNWs/生态弹性体压力传感器会沿作用力方向变形，导致导电多维纳米材料相互接触。因此，两种纳米材料之间改进的网络扩展了电流路径，增加了通过连接到传感器的电极检测到的电流。rGO/AgNWs/生态弹性体压力传感器在柔性生态弹性体内具有多孔结构，在0 - 120 kPa的宽检测范围内表现出高灵敏度（高达2.29 kPa）。这使得能够监测广泛的运动，包括细微触摸、呼吸振动和饮水等小压力，以及人体运动、手指/手臂弯曲和足部压力等大压力，使其成为需要精确压力检测的应用的优秀候选者。
