Abstract
Selective adsorption of an anionic species on an alkali metal‐free lead phosphate glass membrane on a metal oxide semiconductor (MOS) diode was studied using capacitance‐voltage curves and electron spectroscopy for chemical analysis (ESCA) measurements. The phosphate glass‐coated MOS diode shows a linear relationship between the anion concentration and the relative capacitance change. The oxygen binding energy in the phosphate glass as determined by ESCA spectra shows two types of peaks 23.85 and 26.56 eV. It can be concluded that the anionic species can adsorb preferably on the lower surface anionic site and that the anion selective characteristics originate from the MOS diode surface.
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