Direct Electrical Sensing of Iodine Gas by a Covalent Organic Framework-Based Sensor

Rapid and highly sensitive detection of iodine gaseous species is crucial as the first response in case nuclear accidents waste clean-up. A robust user-friendly sensor-based technology that allows online monitoring desirable. Herein, we report success using a covalent organic framework (AQ-COF)-based sensor for real-time gas adsorption by electrochemical impedance spectroscopy (EIS) technique. The exhibits high sensitivity pronounced electrical to trace amounts vapor. Gaseous was readily detected with significant change resistance (104×) at 70 °C within 5 min exposure air. Notably, EIS quite chemoselective over other common such air, methanol, ethanol, water, selectivity 320, 14, 49, 1030, respectively. mechanical study shows can reduce optical bandgap AQ-COF, causing drop significantly. This demonstrates how enrichment effect selective I2 be leveraged create direct radioactive toxins.