Visual Chemical Detection Mechanism by a Liquid Gating System with Dipole-Induced Interfacial Molecular Reconfiguration.

Chemical detection has a wide range of applications. The detection of a certain substance is so vital that new detection mechanisms with features such as low-cost, accessibility, and readily available visual markers are in demand. Herein, a liquid-gating-based chemical-detection mechanism is reported, which has a dynamic gas/liquid interface due to dipole-induced interfacial molecular reconfiguration. The mechanism exhibits a sensitive relationship between the dipole-force-induced rearrangement of interfacial molecules and transmembrane gating behavior. These features can be utilized to create visual markers for detection by converting the analyte-mediated interfacial interaction to a pressure-driven marker movement. This "green" detection mechanism requires no electrical energy input and has readily available markers for anyone to observe directly. This new mechanism opens a window for a more in-depth exploration of combining liquid-gating mechanisms with detection mechanisms.