High sensitivity of a ZnO nanowire-based ammonia gas sensor with Pt nano-particles
We report the growth of high-density single crystalline ZnO nanowires on a patterned ZnO:Ga/SiO2/Si template, the adsorption of Pt nano-particles on the nanowire surface, and the fabrication of a ZnO nanowire-based NH3 gas sensor. It was found that the sensor responses were 22.5% and 36% for the nanowires without and with Pt adsorption when the chamber was injected with 1000 ppm of NH3 gas at 300C. With Pt adsorption, it was found that the measured sensitivities were around 16%, 22%, 26% and 36% when the concentration of the injected NH3 gas was 100, 200, 500 and 1000 ppm, respectively.
zno nanowires pt adsorption ammonia sensor