Pt-functionalized graphene/Si heterostructure for hydrogen sensing

In this work, H₂ 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 H₂ molecules in ambient conditions at room temperature. Successful detection of 10 ppm H₂ 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 H₂ sensing has been obtained for graphene/Si devices compared to the simple graphene sensor in ambient condition.