At high r.h., an increase in conductance has been reported for GO and is attributed to sorption of water molecules on the hydrophilic GO structure, forming chains of ionic conductivity. Here, hydroxy and epoxy groups provide proton hopping sites for water conductivity according to the Grotthuss mechanism. The films with lower degree of reduction show higher responses arising from the higher number of polar functional groups providing sorption sites for water molecules. Figure ) shows the relative conductance changes after 4 min transient exposure to increased r.h. of the TNP-L sensor and the reference GO/rGO sensor, for different r.h. levels. While the GO/rGO reference sensor shows little hysteresis and good linearity in the applied r.h. range, the response amplitude is enhanced by a factor of ∼20 for the TNP-based film. The TNCs may provide additional sorption sites for water molecules, and the intercalation of TNCs between GO sheets can yield a larger overall surface area with accessible sorption sites for water molecules, compared to the multilayered pure GO/rGO film. Response times t 90 , corresponding to the time needed to reach 90% of the relative conductance change after 4 min, were determined for the TNP-L and GO-R sensor at ∼70% r.h. The GO-R sensor shows a response time of 9 s, while the TNP-L sensor shows via the LbL-SC procedure, and exposed to DUV light for different times, so that both the resistive and gravimetric sensors include hybrid films of gradually increasing degrees of reduction to enable a qualitative comparison. The coated QCMs and the resistive sensors were placed in one test cell and exposed to humidity at different r.h. levels in the same experiment. Purified air (0% r.h.) was used as ZG. R.h. levels of up to ∼27% were provided using a gas calibration system with a vapor saturation unit, while higher r.h. levels (> 40%)