Capacitance Characteristics of the Polycrystalline CdS / NaOH and CdS / Cysteine Interfaces

Flatband potentials of polycrystalline have been determined as a function of p H, in the absence and in the presence of cysteine. From p H 10, the linear dependence of with p H is explained by a hydroxylation of the electrode surface. With cysteine, two negative steps occur at p H's corresponding to the two 's of the reductant, emphasizing the dependence on the degree of ionization of the amino acid.