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Van 't Hoff Institute for Molecular Sciences null

Measuring CO2 concentrations at ambient conditions with metal-organic frameworks

24 April 2020

In a collaboration with the Holst Centre (imec), the Functional Materials group of Dr Stefania Grecea has demonstrated that metal-organic frameworks (MOFs) can be used as effective sensing layers for effective CO2 level monitoring. These materials have the advantage that can be processed and integrated easily into inexpensive impedance sensors. The article is part of a collection of papers on 'Molecular Systems for Sensing' of the RSC journal Molecular Systems Design & Engineering.
three devices
Image: HIMS.

Abstract

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.

Publication

Bohui Ye, Andreea Gheorghe, Roy van Hal, Marcel Zevenbergen, Stefania Tanase: Zn-MOF-74 as sensing material for effective CO2 detection. Molecular Systems Design & Engineering, 2020, 5, 1071-1076 DOI: 10.1039/D0ME00004C