show similar response amplitudes, as well as almost identical baseline resistances, suggesting that the saturation conductance attainable via the photocatalytic reduction was reached for these films (cf. Figure ). The films with high rGO content, however, showed pronounced baseline drifts at very high r.h. (e.g. ∼80%). We attribute this finding to spontaneous condensation of water on the films. The timetraces for all resistors can be found in the Supporting Information, Section S11.