MOF-Based Chemiresistive Gas Sensors: Toward New Functionalities

The sensing performances of gas sensors must be improved and diversified to enhance quality of life by ensuring health, safety, and convenience. Metal-organic frameworks (MOFs), which exhibit an extremely high surface area, abundant porosity, and unique surface chemistry, provide a promising framework for facilitating gas-sensor innovations. Enhanced understanding of conduction mechanisms of MOFs has facilitated their use as gas-sensing materials, and various types of MOFs have been developed by examining the compositional and morphological dependences and implementing catalyst incorporation and light activation. Owing to their inherent separation and absorption properties and catalytic activity, MOFs are applied as molecular sieves, absorptive filtering layers, and heterogeneous catalysts. In addition, oxide- or carbon-based sensing materials with complex structures or catalytic composites can be derived by the appropriate post-treatment of MOFs. This review discusses the effective techniques to design optimal MOFs, in terms of computational screening and synthesis methods. Moreover, the mechanisms through which the distinctive functionalities of MOFs as sensing materials, heterostructures, and derivatives can be incorporated in gas-sensor applications are presented.

Automated summary

In order to improve the performance of gas sensors and enhance the quality of life, the use of metal-organic frameworks (MOFs) as sensing materials has been explored. MOFs are known for their high surface area, porosity, and unique surface chemistry, making them promising for gas-sensor innovations. Various types of MOFs have been developed by studying their compositional and morphological dependences, and incorporating catalysts and light activation. Additionally, MOFs have multiple applications as molecular sieves, absorptive filtering layers, and heterogeneous catalysts due to their separation properties and catalytic activity.