Ultra-efficient room-temperature H2S gas sensor based on NiCo2O4/r-GO nanocomposites

Abstract

NiCo₂O₄/r-GO nanocomposites were obtained using hydrothermal synthesis, followed by an annealing treatment. The products were examined by XRD, FESEM, TEM, and XPS, which indicated that the NiCo₂O₄/r-GO nanocomposites were synthesized successfully. For exploring their potential applications in the gas detection field, gas sensors were fabricated by employing the NiCo₂O₄/r-GO nanocomposites and explored for their sensing ability towards H₂S at room temperature. It could be found that the NiCo₂O₄/r-GO nanocomposites exhibited a relatively high response of 3.51 and very short response time of 2 s when exposed to 100 ppm of H₂S, which were higher and faster, respectively, than those of pure NiCo₂O₄. Moreover, the reasons for the enhancement in the sensing properties by combining with r-GO were also discussed.