Fig. 2
From: Study on adsorption and desorption of ammonia on graphene
Time response of graphene conductance to water vapor. The time response of graphene gas sensor to water vapor (the relative humidity was 85 %) given in dimensionless units of 100 × ∆σ/σ0 where σ0 stands for the conductance of the graphene sensor and ∆σ is the change in conductance due to H2O flow