The advanced in-situ detection of gaseous pollutants (e.g. NOx and SOx) is of great interest in many applications, such as the automotive and coal industries. Here we leverage the previous successful development of impedance spectroscopy-based sensors for the detection of gaseous I2 to develop a novel sensor for the detection of these gaseous pollutants. During initial development of an I2 sensor, metal-organic framework (MOF ZIF-8) material was utilized as an adsorbent layer deposited onto Pt interdigitated electrodes. The MOF was demonstrated to selectively absorb I2, irreversibly, from a complex gas stream with a (&gt;105x) change in measured impedance across the electrodes. Further studies aimed at developing a robust sensor examined other materials, including zeolites and additional MOFs. It was demonstrated that utilizing MFM-300(X-metal center) active materials enabled a reversible electrical response with gas adsorption. The current work is focused on exploring these same nanoporous phases (MOFs, zeolites, etc.) for the real-time detection of NOx and SOx. The down-selection of candidate materials from bulk synthesis and gas selectivity testing will be discussed. Methods for deposition of these materials onto the Pt interdigitated electrodes, and initial sensor performance during controlled gas exposures will be presented.

Nanoporous-based sensors for impedance spectroscopy-based detection of gaseous pollutants

ACS Spring 2022

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