Solid-state intramolecular motions in continuous fibers for fluorescent humidity sensor

One striking feature of molecular rotors is their ability to change conformation with detectable optical signals through molecular motion when stimulated. However, due to the strong intermolecular interactions, synthetic molecular rotors have often relied on fluid environments. Scientists at Donghua University and HKUST take advantage of the solid-state intramolecular motion of aggregation-induced emission molecular rotors and one-dimensional fibers, developing highly sensitive optical fiber sensors that respond to ambient humidity rapidly and reversibly with observable chromatic fluorescence change.