Selective gas sensors using graphene and CuO nanorods.

Highlights • Sensitive and selective gas sensors fabricated using graphene and CuO nanorods. • The nanorods were deposited on either graphene/SiO2/Si substrates. • The sensors were found to be selective to H2S at concentrations as low as 10 ppm. • The sensors operate at room temperature which indicates their low power needs. Abstract This work reports on the fabrication of sensitive and selective gas sensors fabricated using graphene and/or copper oxide (CuO) nanorods. Herein, three batches of sensors were produced based on graphene/SiO 2 /Si, CuO nanorods, and graphene/SiO 2 /Si decorated with CuO nanorods. The nanorods were synthesized chemically and deposited on either graphene/SiO 2 /Si or glass substrates. The produced sensors were tested against H 2 S and H 2 gases. Sensors based on CuO/graphene/SiO 2 /Si were found to be selective to H 2 S and sensitive to concentrations as low as 10 ppm. Furthermore, the sensors could detect H 2 S at room temperature which indicates their low power consumption. The produced sensors have potential for applications in industries that include release of H 2 S such as petroleum refineries. [ABSTRACT FROM AUTHOR]