Combined measurement of surface potential and zeta potential at insulator/electrolyte interfaces

Simultaneous measurements of relative surface potential and zeta potential, as monitored by streaming potential measurement, were made at the interface between Si/sub 3/N/sub 4/ (on a semiconductor substrate) and aqueous electrolytes of varied pH. The light-addressable-potentiometric-sensor (LAPS) technique was used to make the simultaneous measurements. The results indicate the zero zeta potential occurred at an electrolyte pH of 3.1. Upon changing pH, approximately 10% of the surface potential change also appeared as a change in zeta potential.<>