Fig. 2: Humidity sensing mechanism.
From: Fully biodegradable printed electronic sensors based on biomass-derived graphene inks and agripapers
At low humidity, the as-printed dense graphene nanoplatelet film forms a highly percolating conductive network with relatively low measured resistance. As the CNC-graphene film swells upon water absorption, the conductive pathways through the percolating network are hindered, resulting in increased measured resistance.
