Figure 6
From: A room-temperature ultrasonic hydrogen sensor based on a sensitive layer of reduced graphene oxide
Response of the sensor to H2 with different concentrations and NH3. (a) Dynamic responses of the sensor to H2 with different concentrations mixed in argon. (b) Dynamic responses of the sensor to five cycles of H2 of 100 ppm mixed in argon. To speed up the recovery process, we introduce wet air into the text box to exhaust H2 in the experiments. (c) The frequency shift and loss variation versus the concentration of H2. (d) The frequency shift of the sensor to 100 ppm NH3 mixed in argon with a relative humidity of 60%.
