Accurate monitoring of human motion holds enormous promise for broad applications, such as athlete training, rehabilitation, health monitoring, and gaming. Wearable sensors are required to have intimate contact with the skin, wide sensing range, high sensitivity, and outstanding durability. In this paper, we report ultrastretchable and wearable strain sensors that were fabricated using embedded 3D printing technology. Piezoresistive sensitivity of the 3D printed sensors was optimized by tailoring the loading of carbon nanotubes, curing temperature, and 3D printing parameters to impart beneficial alignment of nanoparticles in the strain sensing direction. The optimized sensors demonstrated an average gauge factor in a wide strain range as high as 3.4, a low elastic modulus of 83.4 kPa, and a 535% maximum tensile strain before fracture, allowing long-lasting, comfortable, and reliable contact with the human skin. The 3D printed sensors were used to detect skin elongation during limb movement, showing excellent dynamic and step sensing functionalities with negligible strain rate dependence and superb durability.

对人体运动的精确监控在运动员训练，康复，健康监控和游戏等广泛应用中具有广阔的前景。可穿戴式传感器需要与皮肤紧密接触，宽广的感应范围，高灵敏度和出色的耐用性。在本文中，我们报告了使用嵌入式3D打印技术制造的超拉伸和可穿戴应变传感器。通过定制碳纳米管的负载量，固化温度和3D打印参数来优化3D打印传感器的压阻灵敏度，以使纳米粒子在应变感应方向上实现有益的对齐。经过优化的传感器显示出在高达3.4的宽应变范围内的平均应变系数，83.4 kPa的低弹性模量以及断裂前最大拉伸应变的535％，允许与人类皮肤持久，舒适和可靠的接触。3D打印传感器用于检测肢体运动过程中的皮肤伸长，显示出极佳的动态和步进感测功能，且应变率依赖性可忽略不计，并且具有出色的耐用性。