Strong\nand Healable Elastomers with Photothermal-Stimulus\nDynamic Nanonetworks Enabled by Subnano Ultrafine MoO<sub>3–<i>x</i></sub> Nanowires

One-dimensional nanomaterials have\nbecome one of the most available\nnanoreinforcing agents for developing next-generation high-performance\nfunctional self-healing composites owing to their unique structural\ncharacteristics and surface electron structure. However, nanoscale\ncontrol, structural regulation, and crystal growth are still enormous\nchallenges in the synthesis of specific one-dimensional nanomaterials.\nHere, oxygen-defective MoO<sub>3–<i>x</i></sub> nanowires\nwith abundant surface dynamic bonding were successfully synthesized\nas novel nanofillers and photothermal response agents combined with\na polyurethane matrix to construct composite elastomers, thus achieving\nmechanically enhanced and self-healing properties. Benefiting from\nthe surface plasmon resonance of the MoO<sub>3–<i>x</i></sub> nanowires and interfacial multiple dynamic bonding interactions,\nthe composite elastomers demonstrated strong mechanical performance\n(with a strength of 31.45 MPa and elongation of 1167.73%) and ultrafast\nphotothermal toughness self-healing performance (20 s and an efficiency\nof 94.34%). The introduction of MoO<sub>3–<i>x</i></sub> nanowires allows the construction of unique three-dimensional\ncross-linked nanonetworks that can move and regulate interfacial dynamic\ninteractions under 808 nm infrared laser stimulation, resulting in\ncontrolled mechanical and healing performance. Therefore, such special\nelastomers with strong photothermal responses and mechanical properties\nare expected to be useful in next-generation biological antibacterial\nmaterials, wearable devices, and artificial muscles.