The functionalized sensors were mounted in a 3D-printed sample holder, S.I. Cycles of separately humidified nitrogen gas vents and liquid phase solvent additions (1 L-100 L were carried out using micro-syringes (Hamilton, 10 L/50 L/100 L) while monitoring the device resistance to determine the solvent response. The vapor phase concentration (ppm) arising from liquid phase aliquots of target individual VOCs (methanol (99.8%, Merck), ethanol 99.9%, Ocon), isopropyl alcohol (99.5% Merck), acetone (99.5%, Merck)) was verified using a photoionization detector (Tiger PID, 11.7 eV lamp), standardized against a reference gas (100 ppm isobutylene in balance air).