Highly sensitive H2S detection sensors at low temperature based on hierarchically structured NiO porous nanowall arrays

摘要: 3D network-like, hierarchically structured, porous nanowall NiO arrays were grown in situ on ceramic tubes by a facile but environmentally friendly hydrothermal reaction with subsequent calcination process. The constructed of the interconnected nanosheets, which further assembled abundant nanoparticles. gas-sensing properties such array film sensors investigated eight inorganic and organic gases. H2S-sensing performance was observed to be large dynamic range (1 ppb 100 ppm) lowest detection limit 1 at 92 °C compared other reported oxide-based sensors. sensor exhibited not only high sensitivity, good selectivity reproducibility H2S resistance humidity low temperature room temperature, also linear relationship under concentration ranges ppm level (1–100 ppm). excellent sensing this could ascribed structures unique specific surface area, benefit molecules adsorb/desorb onto/from as well electron transfer. formation their possible mechanism are discussed detail.