Thermal/Near‐Infrared Light Dual‐Responsive Reversible Two‐Way Shape Memory cEVA/2D‐MoO<sub>2</sub> Composite for Multifunctional Applications
Chaobo Hao, Cong Wei, Yujie Wang, Zhichao Sun, Hao Liu, Ruixin Dai, Miaoming Huang, Suqin He, Wentao Liu, Chengshen Zhu
Abstract
Abstract Light‐responsive reversible two‐way shape memory polymers (2W‐SMPs) are highly promising for many fields due to indirect heating, clean, and remote control. In this work, a composite with both thermal‐ and near‐infrared (NIR) light‐induced reversible two‐way shape memory effect (2W‐SME) is prepared by doping extremely little quantities of 2D non‐layered molybdenum dioxide nanosheets (2D‐MoO 2 ) into semicrystalline poly(ethylene‐ co ‐vinyl acetate) (EVA) networks. This is the first report on light‐induced reversible two‐way shape memory composites employing 2D‐MoO 2 as photothermal fillers. Upon switching the NIR light on and off, due to the excellent photothermal feature and stability of 2D‐MoO 2 , the composite exhibits remarkable light‐induced reversible 2W‐SME. A light‐driven actuator for sensing applications is designed based on the composite and the circuit, where the lamp acting as an alarm can raise and fade upon responding to NIR light. A completely flexible, fuel‐free self‐walking soft robot is designed based on the advantages of the light‐responsive reversible 2W‐SMPs. Additionally, the composite acting as a light‐fueled crane is able to lift and lower a load that is 3846 times its own weight. The results demonstrate that the prepared composite has a promising prospect for applications as actuators, self‐walking soft robot and crane.