Three-dimensional reduced graphene oxide/cobaltosic oxide as a high-response sensor for triethylamine gas at room temperature

Three-dimensional (3D) reduced graphene oxide (rGO)/cobaltosic oxide (Co3O4) nanocomposites were prepared by a simple and low-cost hydrothermal method. Characterization results confirmed that rGO sheets were selfassembled to form a crosslinked porous network structure and Co3O4 nanoparticles were uniformly attached to the surface of rGO with the specific surface area of 306.49 m(2)/g. More importantly, the as-obtained 3D rGO/Co3O4 nanocomposites exhibited superior gas sensing property for ultra-low concentration detection of triethylamine (TEA) at room temperature; this was because of the mesoporous structure, large specific surface area, and excellent charge carrier transport properties of the nanocomposites. The response value of the 3D rGO/Co3O4 nanocomposite sensors to 1 ppm TEA gas was approximately 35% at room temperature, with extremely fast response and recovery time. 3D rGO/Co3O4 nanocomposites with excellent sensing performance have potential applications in the field of gas sensors.

Automated summary

In this study, 3D rGO/Co3O4 nanocomposites were prepared using a simple hydrothermal method, exhibiting superior gas sensing properties for ultra-low concentration detection of triethylamine (TEA) at room temperature. The composites' mesoporous structure, large specific surface area, and excellent charge carrier transport properties contribute to their excellent sensing performance, making them potentially useful in the field of gas sensors.