SYNTHESIS AND CHARACTIZATION OF TITANIUM DIOXIDE PAPERED BY SPRAY PYROLYSIS AS NO2 AND H2S GAS SENSOR
Titanium Dioxide nanostructures have been prepared by spray pyrolysis technique. It has been characterized using X-ray diffraction, Field emission scanning electron microscopy (FESEM), as well as optical and electrical techniques. The results show that, by analyzing the surface structure through X-ray diffraction and FESEM, the nanoparticles are tiny, spherical, and the particle size is about 21.39-39.93 nm. The uv-vis observed the edge of absorbance at about 375 nm, absorbance in this region is due to the formation of Titanium dioxide nanoparticles, and the energy band gap was determined at 3.3 eV. The gas response of the tested devices towards nitrogen dioxide (NO2) and hydrogen sulfide (H2S) gases in dry air at different operation temperatures. It has been carried out showing a selectivity towards NO2 with sensitivity up to 51.1% at temperatures 300 °C, while the higher sensitivity to H2S gas is about 52.4%.
Keywords: TiO2, Gas Sensor, Sensitivity, H2S, NO2.