Hydrothermal synthesis of hierarchically flower-like CuO nanostructures with porous nanosheets for excellent H 2S sensing

摘要

AbstractFlower-like CuO nanostructures with porous nanosheets were synthesized on alumina tube using a hydrothermal method without using any surfactant. The flower-like CuO was comprised of interconnected nanosheets with a uniform thickness of 60?nm. These nanosheets had numerous nanoscale pores with diameters ranging from 20?nm to 160?nm. The copper complex ions of [Cu(NH3)4]2+and NH3were identified to be critical for the formation of these flower-like CuO nanostructures with porous nanosheets during the hydrothermal process. Gas sensor to hydrogen sulfide (H2S) based on these porous flower-like CuO nanostructures exhibited high sensitivity, good reproducibility and long-term sensing stability when tested at room temperature of 25?°C. The gas sensor also showed a remarkably high sensing selectivity to the H2S gas. The gas sensing mechanism was investigated, and the formation of CuS on the surface of CuO nanostructure was identified to be critical for H2S sensing.Graphical abstractDisplay OmittedHighlights?Flowerlike CuO nanostructures with porous nanosheets was synthesized.?There were numerous nanoscale pores in each nanosheet.?The flowerlike CuO based H2S sensors exhibited excellent sensing performance.?The flower-like CuO based sensor showed good selectivity in H2S detection.]]>