Optomechanical Microgripper Based on Dual‐Mode Drive of Triazene Crystals

ABSTRACT

The development of organic crystals capable of direct light to mechanical work conversion is essential for advancing soft micro robotics. In this work, we report a novel class of triazene based photomechanical crystals that achieve significant light driven effects by triggering irreversible chemical and physical processes. Specifically, the DMF solvate of BNE follows a path of lattice phase transition induced by the escape of solvent molecules—a physical process that is irreversible yet exhibits a rapid response. In contrast, DNE crystals undergo intramolecular photodecomposition upon irradiation, and this irreversible chemical process generates a high single use mechanical energy output, enough to drive a significant displacement of microspheres. These two crystals can be conceptualized as prototypes for an inherently functionalized light driven micro gripper. DNE is suitable for scenarios requiring high energy single triggers, while BNE is characterized by its rapid response. This study not only provides two high performance light driven materials but also reveals an effective strategy for tailoring irreversible photomechanical responses through crystal engineering of molecular packing. Our findings offer a new paradigm for the rational design of task oriented intelligent soft micro actuators, catering to needs ranging from high force single use triggers to rapid response systems.