Engineering A Smart Nanofluidic Sensor For High-Performance Peroxynitrite Sensing Through A Spirocyclic Ring Open/Close Reaction Strategy

Peroxynitrite (ONOO-) is an important reactive oxygen/nitrogen species that participates in a range of physiological and pathological processes by modulating ion flux through biological channels. Inspired by a ONOO--regulated K+ channel in vivo, herein, we describe the construction of a smart ONOO--driven nanosensor using a spirocyclic ring open/close reaction approach. The prepared nanosensor possessed a prominent ONOO- selectivity and sensitivity and rapid response (similar to 90 s) owing to the specific reaction between ONOO- and ligands on the nanosensor surface with a high ion rectification ratio (similar to 10) and ion gating ratio (similar to 4). Moreover, this nanosensor system also exhibits excellent stability and recyclability. Thus, these results will provide a new direction for the design of nanochannel-based sensors for future practical and biological applications.