Microsensors based on Pt–nanoparticle functionalised tungsten oxide nanoneedles for monitoring hydrogen sulfide

Abstract

Gas microsensors based on non-functionalised and functionalised tungsten oxide nanoneedles with platinum nanoparticles, synthesised and integrated directly onto transducing microsensor platforms via Aerosol Assisted Chemical Vapour Deposition, are fabricated and tested towards various concentrations of hydrogen sulfide and some interfering gases (CO, H₂, NH₃, EtOH). Results show improved sensing characteristics in functionalised microsensors as a result of the incorporation of platinum nanoparticles of reduced size (<4 nm) with even distribution onto highly crystalline tungsten oxide nanoneedles. An arrangement of both non-functionalised and functionalised sensing films in an array of sensors shows the potential of these devices to selectively monitor hydrogen sulfide.