Garrido Jose A, Härtl Andreas, Dankerl Markus, Reitinger Andreas, Eickhoff Martin, Helwig Andreas, Müller Gerhard, Stutzmann Martin
Walter Schottky Institut, Technische Universität München, Garching, Germany, and EADS Innovation Works Germany, EADS Deutschland GmbH, Munich, Germany.
J Am Chem Soc. 2008 Mar 26;130(12):4177-81. doi: 10.1021/ja078207g. Epub 2008 Mar 4.
We investigate the origin of the surface conductivity of H-terminated diamond films immersed in aqueous electrolyte. We demonstrate that in contrast to the in air situation, charge transfer across the diamond interface does not govern the surface conductivity in aqueous electrolyte when a gate electrode controls the diamond/electrolyte interfacial potential. Instead, this almost ideally polarizable interface allows the capacitive charging of the surface. This description resolves the observed disagreement of the pH sensitivity of the diamond surface conductivity in air and in aqueous electrolyte.
我们研究了浸入水性电解质中的氢终止金刚石薄膜表面电导率的起源。我们证明，与在空气中的情况相反，当栅电极控制金刚石/电解质界面电位时，跨金刚石界面的电荷转移并不决定水性电解质中的表面电导率。相反，这个几乎理想的可极化界面允许表面进行电容充电。这一描述解决了在空气中和水性电解质中观察到的金刚石表面电导率对pH敏感性的分歧。
