A GENERAL-MODEL TO DESCRIBE THE ELECTROSTATIC POTENTIAL AT ELECTROLYTE OXIDE INTERFACES

Colloid chemists have proposed several theories to describe the chargi ng mechanism of metal oxides in electrolyte solutions and the resultin g electrical double layer at the oxide surface. In this paper a new ge neral theory to describe the electrostatic potential at the metal oxid e electrolyte solution interface is presented. This theory describes t he variations of the electrostatic potential as a function of the diff erential double layer capacitance and the intrinsic buffer capacity. I SFET measurements are interpreted using this theory, and it is shown t hat these measurements can differentiate between the theories for the double layer and the theories for the charging mechanism for the oxide .