Detection of Hydrogen Permeation through Pure Iron with Light-addressable Potentiometric Sensor

A light-addressable potentiometric sensor (LAPS) is a semiconductor-based chemical sensor, in which the measurement area defined by probe light illuminating plate. In this study, novel method to detect hydrogen permeation through metal was proposed using system, LAPS combined with micro-volume cell. The sensing surface of placed vicinity exit an iron sheet form cell filled Na2HPO4 solution, and then pH change solution due production protons during electrochemical detected. After loading atoms from entry side into sheet, photocurrent – bias voltage characteristics showed shift indicating protons. result suggested possibility applying visualization sites on surface.