Shinde Suraj, Lee Han Eol
Division of Advanced Materials Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeonbuk State 54896, Republic of Korea.
Department of JBNU-KIST Industry-Academia Convergence Research, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeonbuk State 54896, Republic of Korea.
ACS Omega. 2025 Jun 4;10(23):25102-25110. doi: 10.1021/acsomega.5c03752. eCollection 2025 Jun 17.
Wearable and flexible sensors, capable of transducing mechanical stimuli into electrical signals, have attracted significant attention for applications, such as human motion tracking, physiological monitoring, soft robotics, electronic skin, and human-machine interfaces. In this work, we develop a polyacrylamide (PAAm)-based hybrid composite integrated with a conductive hydrogel to simultaneously enhance mechanical robustness and electrical performance for real-time motion sensing. The composite features a double-network hydrogel (DNH) composed of PAAm and sodium alginate, reinforced with MoS nanosheets and ethylene glycol-doped PEDOT:PSS (DNH/MoSNS/EG-PEDOT:PSS), yielding a highly stretchable, adhesive, and conductive material. The adhesive layer exhibits excellent mechanical properties, including a maximum strain of over 500% and a peeling force of approximately 25 N/m, while the conductive layer maintains over 300% stretchability with significantly improved electrical conductivity. The strain sensor demonstrates a gauge factor (GF) of approximately 1.67 with excellent linearity ( ≈ 0.97), along with stable signal response over 10,000 loading/unloading cycles with minimal hysteresis. Real-time motion sensing experiments on human joints and neck movements show high fidelity, stable electrical signals, enabling the detection of subtle motions, such as speech. These results underscore the composite's strong potential for next-generation wearable sensors in healthcare monitoring, rehabilitation, and human-computer interaction systems.
能够将机械刺激转化为电信号的可穿戴柔性传感器，在人体运动跟踪、生理监测、软体机器人、电子皮肤和人机界面等应用领域引起了广泛关注。在这项工作中，我们开发了一种基于聚丙烯酰胺（PAAm）的混合复合材料，该材料集成了导电水凝胶，以同时增强机械鲁棒性和电性能，用于实时运动传感。该复合材料具有由PAAm和海藻酸钠组成的双网络水凝胶（DNH），并用MoS纳米片和乙二醇掺杂的PEDOT:PSS（DNH/MoSNS/EG-PEDOT:PSS）增强，从而产生一种高度可拉伸、粘性和导电的材料。粘性层表现出优异的机械性能，包括超过500%的最大应变和约25 N/m的剥离力，而导电层保持超过300%的拉伸性，同时导电性显著提高。应变传感器的应变计因子（GF）约为1.67，线性度极佳（≈0.97），并且在10000次加载/卸载循环中具有稳定的信号响应，滞后极小。在人体关节和颈部运动上进行的实时运动传感实验显示出高保真、稳定的电信号，能够检测到细微的运动，如语音。这些结果突出了该复合材料在医疗保健监测、康复和人机交互系统中下一代可穿戴传感器方面的强大潜力。
