▎ 摘　　要

NOVELTY - Selective hydrogen detection method having a heterojunction in graphene-based devices, comprises: (a) depositing graphene material (1) previously prepared on a substrate (3) which favors its electronic properties; (b) making device, preferably in the FET configuration in the invasive geometry; (c) providing cleaning thermal treatment for elimination of the residues from the previous steps; (d) exposing the heterojunction formed in the interlace between metal and graphene of the device, and the region of the graphene channel, the hydrogen gas molecules; and (e) providing monitoring of the resistance or electrical current of the graphene device between any two terminals (electrical metal contacts (2)) of the device. USE - The selective hydrogen detection method is useful for selective hydrogenation sensing for leak detection, measurement or control of gas concentration in the synthesis processes of ammonia, methanol, hydration of hydrocarbons, in the desulfurization of petroleum, in the aluminum melting process, in the monitoring of environmental pollution, in processes for the production of hydrogen as fuel and refueling stations and fuel cell based engines (claimed). ADVANTAGE - The selective hydrogen detection method: utilizes the heterojunction formed between the graphene and the graphene in FET devices that allow the inversion of the heterojunction (p-n junction) which results in a modification in the electronic conduction, allowing the detection of the (0.1-100%), need for functionalization of graphene and the junction acts as a scattering region leading to an increase in resistance of the device and allowing the detection of the gas through its housing in the interlayer constructed between the graphene and the metal contacts providing an inverted electronic conduction monitored via variation of resistance to electrons and holes or monitoring the electrical current of the material between any two terminals of the device and the heterojunction allows substrates and electrical contacts to be portable and reusable; and is a simpler, easier and reversible method of selective hydrogenation sensing because it involves the modification of the heterojunction formed in the metal-graphene interface for the selective detection of high pressure hydrogenation and free of poisoning processes, thus reducing costs and allowing greater flexibility of materials for the sensing effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for use of the heterojunction in a graphene-based device in the selective detection of hydrogen.