In conclusion, the use of TNC-mediated photocatalytic reduction is an efficient approach to achieve optimized GO/rGO ratios for sensor applications. Films with higher rGO content show higher conductivities and concentration-dependent resistance changes at low humidity, while films with higher GO content show reliable performance at high r.h., highlighting the potential for the fabrication of humidity sensors with tunable sensing properties, and their use, e.g., as ratiometric sensors, or in applications requiring specific detection ranges.