Transparent, photothermal and stretchable alginate-based hydrogels for remote actuation and human motion sensing
2022
Sun, Zhichao | Hu, Yaxin | Wei, Cong | Hao, Rui | Hao, Chaobo | Liu, Wentao | Liu, Hao | Huang, Miaoming | He, Suqin | Yang, Mingcheng
Multifunctional hydrogels show potential applications in actuators and wearable sensors. However, it is still a challenge to develop a photothermal responsive conductive hydrogel with high transparency, mechanical properties, broad sensing range, and low-temperature resistance. In this work, a transparent, photothermal responsive, and highly stretchable alginate-based hydrogels was feasibly constructed by adding two-dimensional non-layered molybdenum dioxide nanosheets (2D-MoO₂) to sodium alginate/polyacrylamide mixture and then soaking into the calcium chloride solution. The introduction of 2D-MoO₂ renders the hydrogels excellent photothermal properties and controllable photomechanical deformation under near-infrared irradiation, while maintaining high transparency (~60 %).The calcium ions give the hydrogel excellent mechanics, conductivity, and freezing tolerance concurrently. The transparent hydrogel-based sensor shows wide sensing range (0–1800 %) and cycling stability in detecting deformations and real-time human motions even in harsh environments. Therefore, this work provides a new route for generating transparent multifunctional hydrogels towards the applications of remote actuation and strain sensing.
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