▎ 摘　　要

NOVELTY - The gas detection device comprises a substrate (302), a sensing device coupled to the substrate, and a graphene membrane coupled to the sensing device by an insulating frame and/or electrode contacts. The sensing device includes a graphene sensor configured to detect a presence of gases. The graphene membrane includes discrete pores having a size-selective to pass the gases across the graphene membrane such that the sensing device is operable to detect the presence of the gases, and a graphene monolayer (306) with the discrete pores (308) having a uniform pore size. USE - The device is useful for detecting gas molecules in a fluid mixture, where the gas includes hydrogen. ADVANTAGE - The device reliably detects the selective gas molecules in the mixture without any contaminations and with less power consumption and high sensitivity. DETAILED DESCRIPTION - The gas detection device comprises a substrate (302), a sensing device coupled to the substrate, and a graphene membrane coupled to the sensing device by an insulating frame and/or electrode contacts. The sensing device includes a graphene sensor configured to detect a presence of gases. The graphene membrane includes discrete pores having a size-selective to pass the gases across the graphene membrane such that the sensing device is operable to detect the presence of the gases, and a graphene monolayer (306) with the discrete pores (308) having a uniform pore size. Each pore is characterized by carbon vacancy defects in the graphene monolayer. The graphene monolayer is characterized by selectivity to hydrogen, by a separation selectivity of hydrogen: methane of 200:1 and by a minimum separation of 2.5 Angstrom . The carbon vacancy defects in the graphene monolayer are passivated with hydrogen. The sensing device includes metal-oxide-, non-metal oxide-, catalytic-, optical-, resistance-based-, thermally conductive-, work function-based-, mechanical-, acoustic- and electrochemical sensors configured to detect the presence of hydrogen. The graphene sensor is deposited with palladium nanoparticles. INDEPENDENT CLAIMS are included for: (1) a method for detecting a gas molecule in a fluid mixture including gases; and (2) a system for manufacturing a gas detection device. DESCRIPTION OF DRAWING(S) - The diagram shows a schematic side view of a membrane. Substrate (302) Fluid mixture (304) Graphene monolayer (306) Discrete pores of graphene monolayer (308) Molecules of fluid mixture. (312)