CO2 sensing under ambient conditions using metal–organic frameworks†
Determining accurately CO2 levels is highly relevant when monitoring indoor air quality. Nondispersive infrared (NDIR) sensors are the most often used sensors for measuring carbon dioxide concentration. However, the complexity of the device, power consumption and scalability are the main drawbacks associated with the state-of-the-art devices. In this work, we discuss the application of metal–organic frameworks for sensing of CO2 molecules using electrochemical impedance spectroscopy. Impedance CO2 sensors were fabricated using two metal–organic frameworks known for their selective CO2 adsorption capability as well as their high proton conductivity, namely Zn-MOF-74 and NdMo-MOF. Both sensors showed a significant change in impedance when changing the CO2 concentration and the relative humidity. Notably, the Zn-MOF-74 impedance sensor showed fast response when changing the humidity and CO2 concentration.
- This article is part of the themed collection: Molecular systems for sensing