Metal–Organic Frameworks Materials for Capacitive Gas Sensors.

Gas sensors have been widely used in detection of industrial gas leak, air quality detection, and medical diagnosis. Although some chemical sensors have been commercialized, there are still some challenges such as sensitivity, cycle stability, and high power consumption. Metal–organic frameworks (MOFs) have high specific surface area, rich porosity, and excellent reversible/selective adsorption ability for various gases. Therefore, MOFs has been considered as an ideal sensing material. Metal active sites and active functional groups on the surface of MOFs can combine with gas molecules through hydrogen bonds, van der Waals interactions, and electrostatic interactions, resulting in highly effective selectivity and superior cycle reversibility. Meanwhile, MOFs‐based capacitive gas sensor can respond at room temperature, which can largely reduce energy consumption during the test. Therefore, the application of MOFs materials in capacitive gas sensors can effectively solve the above problems. In this review, the latest studies on MOFs‐based capacitive gas sensors for acidic/alkaline, VOCs, and water are summarized, and research prospects based on the mechanism of MOFs as sensing layers and filtering layers are proposed. [ABSTRACT FROM AUTHOR]