The Effect of Temperature on the Oxygen Sensing by Graphen

We have synthesized graphene using Hammers method. Then the Oxygen sensor is fabricated with qualified graphene nanosheets covered SiO2/Si wafer and Ohmic contact in tow corners. Finally, we investigate the sensitivity of it when exposed to Oxygen at ambient condition in air and at different temperatures. A resistive graphene-based gas sensor prepared in this way revealed p-type oxygen response at room temperature. So the absorption of Oxygen molecules on it increases the carrier density and cause to increase the electrical current across it. The variations of electrical current across the sensor, when exposed to Oxygen flow, get increased by increasing temperature.