Figure 2
From: Charge-transfer-based Gas Sensing Using Atomic-layer MoS2
Gas-sensing using the MoS2 device.
(a) 3D schematic of the MoS2 gas-sensing device for NO2 and NH3. (b) Transient NO2 gas response at 1.5 to 50 ppm gas at operating temperatures of RT and 100°C. In the NO2 gas mode, the resistance increases (positive sensitivity). The recovery rate of NO2 is higher at 100°C than at RT. (c) The transient NH3 gas response at 1.5 to 50 ppm gas at operating temperatures of RT and 100°C. The resistance decreases with the adsorption of NH3 gas molecules (negative sensitivity). The NH3 sensing signal is negligible at 100°C. (d) Comparison of the NO2 and NH3 sensitivities at different gas concentrations and operating temperatures. The highest selectivity of NO2 to NH3 was obtained when the concentration reached 20 ppm at 100°C.
