文摘
Metal oxide/graphene nanocomposites are emerging as one of the promising candidate materials for developing high-performance gas sensors. Here, we demonstrate sensitive room-temperature H<sub>2sub>S gas sensors based on SnO<sub>2sub> quantum wires that are anchored on reduced graphene oxide (rGO) nanosheets. Using a one-step colloidal synthesis strategy, the morphology-related quantum confinement of SnO<sub>2sub> can be well-controlled by tuning the reaction time, because of the steric hindrance effect of rGO. The as-synthesized SnO<sub>2sub> quantum wire/rGO nanocomposites are spin-coated onto ceramics substrates without further sintering to construct chemiresistive gas sensors. The optimal sensor response toward 50 ppm of H<sub>2sub>S is 33 in 2 s, and it is fully reversible upon H<sub>2sub>S release at 22 °C. In addition to the excellent gas adsorption of ultrathin SnO<sub>2sub> quantum wires, the superior sensing performance of SnO<sub>2sub> quantum wire/rGO nanocomposites can be attributed to the enhanced electron transport resulting from the favorable charge transfer of SnO<sub>2sub>/rGO interfaces and the superb transport capability of rGO. The easy fabrication and room-temperature operation make our sensors highly attractive for ultrasensitive H<sub>2sub>S gas detection with less power consumption.