Further, LIG active material strongly cross-selects to humidity requiring the intervention of hydrophobic layers to mitigate its deleterious effects in channel-type devices . Similarly, the high native selectivity of the LIG to NO2 would be another undesirable cross-selectivity limiting functionalization towards other VOC analyte targets. Therefore, functionalized gap structures with LIG support electrodes, allow for electrode resource reduction and higher sensitivity, without introducing undesirable cross-selectivities.