▎ 摘　　要

NOVELTY - The differential gas sensor (100) has a first sensor component (10) that is configured to selectively detect a first gas present in the environment and to supply a first output signal. A second sensor component (20) is configured to supply a second output signal. A circuit is configured to determine a difference between the first output signal and the second output signal. A functional layer (13) of first sensor component is made of graphene, metal, thin metal layer, palladium, nickel, titanium, PTFE, and polymethyl methacrylate. The material of the functional layer is selectively permeable to hydrogen or helium. USE - Differential gas sensor used for detection, storage and transportation of gaseous hydrogen in container or line, attached to inlet opening and/or outlet opening of fuel cell and in passenger compartment of motor vehicle (all claimed). ADVANTAGE - The presence of hydrogen outside hydrogen store is detected safely and reliably. DESCRIPTION OF DRAWING(S) - The drawings show the side cross-sectional views of the gas sensor. 10First sensor component 13Functional layer 14,15Silicon layer 20Second sensor component 100Differential gas sensor