In this research, we investigated the influence of the surface coatings of silver nanowires\non the sensitivity of surface acoustic wave (SAW) humidity sensors. Silver nanowires, with\npoly(vinylpyrrolidone) (PVP), which is a hydrophilic capping agent, were chemically synthesized,\nwith an average length of 15 �¼m and an average diameter of 60 nm. Humidity sensors, with 433 MHz\nfrequency dual-port resonator Rayleigh-SAW devices, were coated by silver nanowires (AgNWs)\nusing the electrospray coating method. It was demonstrated that increasing thickness of coated\nAgNW on the surfaces of SAW devices results in increased sensitivity. The highest frequency shift\n(262 kHz) in these SAW devices was obtained with an injection of 0.5 mL of the AgNW solution with\na concentration of 0.5 mg/mL at an injection rate of 1 mL/h. It also showed the highest humidity\nsensitivity among the other prepared SAW devices.
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