Ultrasensitive NO₂ Gas Sensor Based on Epitaxial Graphene

Figure 6

Response on exposure to the gas mixture containing NO₂ in the low concentration range (exposure periods are marked as light grey bands, annealing periods as dark grey, and recovery periods as hatched bands) at room temperature for the annealed graphene based sensor in the low concentration range. Knee on response curve is highlighted by two additional lines.