Gas sensors based on graphene Comparison of two different fabrication approaches
Graphene’s electronic properties are stronglyaffected by the adsorption of molecules making this materialvery attractive for gas sensing application.The present work investigates the use of graphene as gassensing active layer. Herein, two different approaches tofabricate graphene conductometric sensors were persued:a mechanically exfoliated single graphene flake device anda thin film of chemically exfoliated graphene flakes device.First preliminary findings indicated the second approach asa promising and simple method to fabricate a graphenebased chemiresistor. Electrical sensor characterizations towardsNO2 and moisture are shown. Issues related to fabricationprocesses are also discussed.