Thin film capacitor geometries for VOC detection @ ACS Sensors!

Their chemical diversity, uniform pore sizes, and large internal surface areas make metal−organic frameworks (MOFs) highly suitable for volatile organic compound (VOC) adsorption. In this work, we compare two geometries of capacitive VOC sensors that use the MOF material ZIF-8 as an affinity layer. When using a permeable top electrode (thickness < 25 nm), the metal−insulator−metal sandwich configuration exhibits superior sensitivity, an improved detection limit, and a smaller footprint than the conventional interdigitated electrode layout. Moreover, the transduction of VOC adsorption in ZIF-8 via MIM capacitors is more sensitive to polar VOCs and provides better selectivity at high loadings than gravimetric and optical transductions.

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