Fabrication of solid-state aluminosilicate for ammonia gas detection in ambient temperature

In this present work, Zeolites species of aluminosilicate framework was synthesized by sol–gel method with different ratio of Si/Al (1:1, 1:5, 1:10 and 1:15).The prepared samples were studied by XRD, FTIR, TG/DTA, SEM, TEM,EDAX and SAED analysis. X-ray diffraction patterns indicate that the aluminosilicate have preferred orientation growth along (100) plane with mesoporous structure. The presence of major chemical compounds and network of Si–O–Si, Al–O–Al and Si–O–Al were identified by FTIR study. TG/DTA study shows high-thermal stability. SEM picture shows that highly powdery and heterogeneous.TEM analysis shows tiny tight mass of the active delaminated species gathered to form smooth surface. The SAED pattern reveals that platy structure and well-ordered in atomic scale. The gas sensitivity properties of aluminosilicate solid work in the ratio Al/Si = 1, 5, 10 and 15 as a function of operating temperature 30 °C for different ammonia concentrations from 100, 250 and 500 ppm. The ammonia gas-sensing analysis revealed that the Al/Si (10 ratio) showed higher gas response compared with other ratios. Al/Si = 10 exhibited the highest response of 30 when exposed to 500 ppm ammonia gas. The complex impedance of the aluminosilicate shows two distinguished semicircles and the diameter of the arcs got decreased in diameter as the increases the concentration of ammonia.