Comparison of Sb 2 O 3 and Sb 2 O 3 /SiO 2 Double Stacked pH Sensing Membrane Applied in Electrolyte-Insulator-Semiconductor Structure.

In this study, electrolyte-insulator-semiconductor (EIS) capacitors with Sb 2 O 3 /SiO 2 double stacked sensing membranes were fabricated with pH sensing capability. The results indicate that Sb 2 O 3 /SiO 2 double stacked membranes with appropriate annealing had better material quality and sensing performance than Sb 2 O 3 membranes did. To investigate the influence of double stack and annealing, multiple material characterizations and sensing measurements on membranes including of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) were conducted. These analyses indicate that double stack could enhance crystallization and grainization, which reinforced the surface sites on the membrane. Therefore, the sensing capability could be enhanced, Sb 2 O 3 /SiO 2 -based with appropriate annealing show promises for future industrial ion sensing devices.