Abstract
The reliability and reproducibility of gas sensors are very important for real applications. The influence of nanofiber length and sensing film thickness on the reliability and response of gas sensing characteristics was investigated. For this, the length of <TEX>$SnO_2$</TEX> nanofibers was controlled by tuning ultrasonic treatment and the different thicknesses of sensing films were prepared by manipulating the amount of slurry deposition. The sensor prepared from long nanofibers (length: <TEX>${\sim}3.6{\mu}m$</TEX>) showed the significant fluctuation of gas sensing characteristics when the film becomes thinner than <TEX>$18{\mu}m$</TEX>, while that prepared from short nanofibers (length: <TEX>${\sim}0.9{\mu}m$</TEX>) showed reproducible sensor response and resistance regardless of film thickness. Moreover, the shortening of nanofibers enhanced the gas response ~2 times, which can be explained by the increase of chemiresistive fiber-to-fiber contacts. The reproducibility, gas response, and selectivity of <TEX>$SnO_2$</TEX> nanofiber gas sensor could be controlled by tuning nanofiber length, film thickness, and catalyst loading.
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