Thermal/Near‐Infrared Light Dual‐Responsive Reversible Two‐Way Shape Memory cEVA/2D‐MoO2 Composite for Multifunctional Applications

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.