Research On Gas Sensing Properties Of Palladium-load Tin Oxide Materials

A high dynamic range H₂S micro gas sensor is achieved utilizing hierarchical Pd-loaded SnO₂ nanostructures as sensing material.SnO₂ nanospheres were synthesized using hydro-thermal method without any surfactants or templates,followed by Pd nanoparticles decoration via a facile method.A hierarchical nanostructure of Pd-loaded SnO₂ is formed and their sensing abilities are compared with pure SnO₂ nanospheres-based sensors.Pd-loaded SnO₂ hierarchical nanostructures showed ultra-sensitive H₂S detection ability down to 10 ppb,high dynamic range（4 order of magnitudes）–up to 200 ppm,and low working temperature（150℃）.This micro gas sensors based on Pd-loaded SnO₂ hierarchical nanostructures thus have great potential in universal H₂S detection application.The fabrication method presented here is simple,renewable and operable,and thus may be extended to synthesize other types of metal oxide-based semiconductor micro sensors for application in various fields.