The Surface Conductivity at the Diamond/Aqueous Electrolyte Interface

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• 作者：Jose A. Garrido ; Andreas Hä ; rtl ; Markus Dankerl ; Andreas Reitinger ; Martin Eickhoff ; Andreas Helwig ; Gerhard Mü ; ller ; Martin Stutzmann
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：March 26, 2008
• 年：2008
• 卷：130
• 期：12
• 页码：4177 - 4181
• 全文大小：152K
• 年卷期：v.130,no.12(March 26, 2008)
• ISSN：1520-5126

文摘

We investigate the origin of the surface conductivity of H-terminated diamond films immersed inaqueous electrolyte. We demonstrate that in contrast to the in air situation, charge transfer across thediamond interface does not govern the surface conductivity in aqueous electrolyte when a gate electrodecontrols the diamond/electrolyte interfacial potential. Instead, this almost ideally polarizable interface allowsthe capacitive charging of the surface. This description resolves the observed disagreement of the pHsensitivity of the diamond surface conductivity in air and in aqueous electrolyte.