Gas detection device with graphene membrane

A system to manufacture a gas detection device, the system comprising:

• a controller communicatively coupled to a graphene source that provides a graphene membrane, a substrate source that provides a substrate, and a sensor device applicator, wherein the controller is configured to:
• instruct the graphene source to provide the graphene membrane, wherein:
• the graphene membrane includes a graphene monolayer with a plurality of discrete pores having a size-selectivity based on a diameter of each of the plurality of discrete pores for passage of hydrogen across the graphene membrane for detection by a sensor device, and having the size-selectivity for inhibition of passage of methane across the graphene membrane so as to restrict the methane from contact with the sensor device and thus to protect the sensor device from contamination that reduces a sensitivity of the sensor device to detect a presence of the hydrogen,
• the diameter of each of the plurality of discrete pores of the graphene membrane is 2.5 Angstroms, and a hydrogen and methane separation selectivity of the graphene membrane is 10^23:1 based on the diameter of each of the plurality of discrete pores,
• the hydrogen is selectively permeated through the discrete pores of the graphene monolayer by employment of a gradient across the graphene monolayer, and
• the gradient includes one or more of a temperature gradient, a pressure gradient, a concentration gradient, a polarity gradient, and an electrochemical potential gradient;
• instruct the substrate source to provide the substrate to support the graphene membrane, wherein a portion of a surface of the substrate is depressed to form a cavity in the surface of the substrate;
• and
• instruct the sensor device applicator to position the sensor device within the cavity of the surface of the substrate, wherein the sensor device is confined below the surface of the substrate by being positioned within the cavity, wherein the sensor device is configured to detect the presence of the hydrogen that crosses the graphene membrane, and wherein the sensor device comprises a rigid graphene sensor deposited with palladium nanoparticles to detect the presence of the hydrogen.