Sensitivity and Selectivity Between Test Gases in Set (1) LPG, Ethanol, and Acetone and Set (2) NH3, Methanol, and NO2 of BaTiO3/Ag/WO3 Nanocomposite

In this article, the enhanced sensitivity and selectivity with response and recovery time were established between test gases in Set (1) liquefied petroleum gas (LPG), ethanol, and acetone and Set (2) NH3, methanol, and NO2 of BaTiO3/Ag/WO3 nanocomposite. The nanocomposite was successfully synthesized by the chemical precipitation method. The structural and morphological properties of nanocomposite were determined using X-Ray diffraction (XRD) and TEM, respectively. The sensitivity was acquired less than 20% for all gases excluding NH3~73% with varying concentration and it was higher than 95% above 170 °C for all gases. Furthermore, in Set (1), selectivity between LPG-acetone and LPG-ethanol gases was achieved ~96% and ~64% at 220 ppm. Furthermore, acetone and acetone-ethanol were used as base gases and selectivity between ethanol and LPG with varying flow rate at 100 °C was found ~72% and ~47% at 220 and 210 ppm, respectively. Moreover, in Set (2), NH3 was kept as a base gas; then, selectivity between methanol and NO2 was obtained ~33% at 220 ppm and ~4% at 140 ppm, respectively, at room temperature (RT) (28 °C), while it reached ~87% and ~57%, respectively, at 300 °C and 220 ppm. It can be concluded that in Set (1) acetone and Set (2) methanol are the only selective gases among all test gases with limit of detection (LOD) between 188 and 618 ppm including high stability 45 days with low response and recovery time.