Surface Functionalized Sensors for Humidity‐Independent Gas Detection

Semiconducting metal oxides (SMOXs) are used widely for gas sensors. However, the effect of ambient humidity on baseline and sensitivity chemiresistors is still a largely unsolved problem, reducing sensor accuracy causing complications calibrations. Presented here general strategy to overcome water-sensitivity issues by coating SMOXs with hydrophobic polymer separated metal–organic framework (MOF) layer that preserves SMOX surface serves gas-selective function. Sensor devices using these nanoparticles display near-constant responses even when varied across wide range [0–90 % relative (RH)]. Furthermore, delivers notable performance below 20 RH whereas other water-resistance strategies typically fail. Selectivity enhancement humidity-independent concomitantly achieved this approach. The reported tandem expected be relevant SMOXs, leading new generation sensors excellent humidity-resistant performance.