Sensing performance of palladium-functionalized WO3 nanowires by a drop-casting method

► Tungsten oxide nanowires were grown by close-spaced vapor transport technique. ► The nanowires were functionalized with palladium nanoparticles deposited by a drop-casting method. ► A comparative study of the sensing performance to reducing gases was conducted. ► It is shown that this simple method improves the sensing performance of the tungsten oxide nanowires.