Pt-functionalized Graphene/Si Heterostructure for Hydrogen Sensing

In this work, H-2 sensing by graphene/Si Schottky diode with Pt functionalization has been demonstrated. Both p-and n-Si/graphene Schottky devices showed conductivity change in presence of H-2 molecules in ambient conditions at room temperature. Successful detection of 10 ppm H-2 in air has been demonstrated. Performance enhancement compared to the Pt-functionalized just graphene based sensor is validated by the response obtained from both device types fabricated on the same chip. Seven fold increase in sensitivity in H-2 sensing has been obtained for graphene/Si devices compared to the simple graphene sensor in ambient condition.