Author_Institution :
Dept. of Phys., Ramnarain Ruia Coll., Mumbai, India
Abstract :
Nanocrystalline ZrO2 (Zirconia) has been synthesized by a conventional precipitation method. The structural, morphological, microstructural, optical and gas-sensing properties of ZrO2 were investigated by using X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis spectroscopy and static gas sensing unit, respectively. X-ray diffraction pattern and TEM of the synthesized product reveal their nano-crystalline nature with grain size 18 nm and 20 nm, respectively. Gas sensing properties of their thick films, which were fabricated by screen-printing to various gases (O2, NO2, C2H5OH, CO, CO2, NH3, LPG, H2S and H2) were tested in ambient air. The ZrO2 thick films showed a high response and selectivity to H2S gas. The effect of operating temperature, gas concentration on the sensing characteristics of these films towards H2S was discussed.
Keywords :
X-ray diffraction; gas sensors; hydrogen compounds; scanning electron microscopy; transmission electron microscopy; ultraviolet spectroscopy; zirconium compounds; H2S; SEM; TEM; UV-vis spectroscopy; X-ray diffraction analysis; XRD; ZrO2; conventional precipitation method; gas sensing application; microstructural properties; morphological properties; nanostructured Zirconia; optical properties; scanning electron microscopy; size 18 nm to 20 nm; structural properties; transmission electron microscopy; Actuators; Gases; Powders; Temperature sensors; Thick films; H2S sensor; characterization; conventional precipitation method; zirconia nanopowder;
