Fig. 1From: Study on adsorption and desorption of ammonia on grapheneThe structure of the gas sensor and a series performance tests. a Gas detection device and graphene-FET sensing device. A graphene sheet bridges the source and the drain electrodes, which closes the circuit. b Raman spectrum of the graphene transferred from highly oriented pyrolytic graphite, indicating that the transferred graphene is a single layer and the graphene layer is not damaged during the transfer (no D peak). a.u. arbitrary units. c I–V g curve (with V ds = 0.05 V) in air (red line) and in vacuum after 20-h vacuum treatment (black line)Back to article page