Hierarchical Co3O4@NiMoO4 core-shell nanowires for chemiresistive sensing of xylene vapor

Hierarchical Co3O4@NiMoO4 core-shell nanowires (NWs) were synthesized utilizing a two-step hydrothermal method. The NWs show a high chemiresistive response (at a temperature of 255 °C) to xylene, with an Rgas/Rair ratio of 24.6 at 100 ppm xylene, while the response towards toluene, benzene, ethanol, and acetone, CO, H2S and NO2 is much weaker. In contrast, pure Co3O4 nanowires exhibit weak responses to all the vapors/gases and poor selectivity....