Room-temperature H2 sensing interfered by CO based on interfacial effects in palladium-tungsten oxide nanoparticles

Abstract In this work, palladium-decorated tungsten oxide nanostructures were synthesized and their gas sensing properties were investigated. The sensor was sensitive to hydrogen at room temperature but not responsive to CO. However, with the presence of CO, the H 2 sensing characteristics were highly affected, which depended substantially on the surrounding CO content. Technically, it is hard to detect a gas adsorption event by a chemical sensor if charge transfer is barely involved. But this work provides a new opinion to solve the problem. Room-temperature CO detection can be realized by a traditional CO-unresponsive hydrogen sensor because adsorbed CO molecules can significantly affect the interfacial hydrogen atom migration rate in Pd-WO 3 nanomaterials.