Construction of Gradient Structure Based on Janus MXene Film Contributing to Bioinspired Actuating Performances

Taking inspiration from nature, researchers make efforts to develop flexible self‐adaptive actuators, which are wearable and able to be integrated in clothing in order to meet the new demands of the intelligent era. MXene, an emerging two‐dimensional nanomaterial, is gaining popularity owing to its unique properties. Herein, a kind of Janus MXene film actuator is developed through a simple method of one‐step vacuum filtration with a specific Celgard 3501 membrane. The cause of the Janus properties and the actuation mechanism are demonstrated in detail. A sample of smart cloth functionalized by the Janus MXene films is further shown to illustrate its potential application. Based on the Janus MXene film actuator, GO/MXene and MXene/PDMS film actuators are designed for enhanced asymmetric structures according to hydrophilicity gradient. Finally, two different structural colors caused by the thin‐film interference and photonic crystals are respectively applied to GO/MXene and MXene/PDMS film actuators, exhibiting chromogenic and chromic phenomena along with actuating performances.