Reversible Stress-memory Phosphorescent Carbon Nanodots via Supramolecular Confinement Engineering for Aerospace...

The development of mechano-responsive room-temperature phosphorescent (RTP) materials with reversibility and durable memory stress-recording capability remains a critical challenge, particularly under extreme operational conditions where covalent bond-dependent systems often suffer from irreversible degradation. Herein, a hydrogen-bond-induced dynamic supramolecular confinement framework is constructed to achieve cyclodextrin-trapped carbon nanodots (CNDs) with reversible and memorable mechano-responsive RTP. Mechanical stress disrupts the metastable hydrogen-bond network and weakens phosphorescence via enhanced non-radiative decay of triplet excitons. Remarkably, the system exhibits a recovery of RTP intensity through ultrasonic reconstruction of the rigid cyclodextrin matrix. When deployed in aerospace structural health monitoring, the CND-embedded film visualizes stress distribution in wings under sudden stress events through RTP weakening. This work establishes a non-destructive monitoring paradigm for an extreme aerospace environment.