Influence of the surface termination on the electrochemical properties of boron-doped diamond (BDD) interfaces

摘要

The paper reports on the electrochemical study of heavily boron-doped diamond (BDD) in aqueous media. Cyclic voltammetry and Mott-Schottky analysis were used to evaluate the influence of the surface termination on the electrochemical properties of BDD electrodes. The behavior of aminated BDD (NH2-BDD) interfaces, prepared from hydrogen-terminated BDD using NH3 plasma and from photochemically oxidized BDD (HO-BDD) using 3-aminopropyltrimethoxysilane (APTMES), are investigated and compared to those of H-BDD and HO-BDD. While H-BDD and HO-BDD electrodes show classical semiconductor behavior, amine-terminated BDD interfaces exhibit metallic behavior at pH < 10 and a semiconductor behavior at more basic pH. (C) 2008 Elsevier B.V. All rights reserved.