Fabrication of uv-activated gas sensor from Tio2 Nanofiber

Abstract

Titanium dioxide nanofibers have been fabricated through electrospinning process. Mixtures of titanium isopropoxide, polyvinylpyrrolidone, polyvinylidyrrolidone, 2-butanone, N,N’-dimethylformamide, and ethanol were mixed into homogeneous solution for electrospinning. Thereafter, electrospun nanofibers were hot-pressed at 180 ℃ for 10 minutes. Hot-pressed electrospun titanium dioxide nanofibers were calcined at 600 ℃ 1 hour. Finally, titanium dioxide nanofibers as sensing materials were obtained. The morphology of titanium dioxide nanofibers was investigated via SEM technique. The diameter of titanium dioxide nanofibers was 467 ± 138 nm. The crystal structure of titanium dioxide nanofibers was analyzed by XRD analysis. It has been found that titanium dioxide nanofibers majorly consisted of anatase phase along with a small degree of rutile phase. The surface area of titanium dioxide nanofibers was 55.84 m²/g Moreover, contact angle measurement of titanium dioxide nanofibers also showed uniform surface of sensing materials The sensing performance of titanium dioxide nanofibers was tested with acetone, methane, and methanol vapor at various contents. The saturation limit acetone. Methane, and methanol vapor was observed about 14, 10, and 12 mmol respectively. Moreover, the gas sensors also show good reproducibility.