Resolving the controversy on the pH sensitivity of diamond surfaces
Resolving the controversy on the pH sensitivity of diamond surfaces
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DOI：
10.1002/pssr.200701266
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发表时间：
2008-01-01
影响因子：
2.8
通讯作者：
Garrido, J. A.
中科院分区：
文献类型：
--
作者：
Dankerl, M.;Reitinger, A.;Garrido, J. A.
h端金刚石表面电导率的pH敏感性一直是争论的焦点，无论是绝对值还是符号都存在争议。本文研究了参比电极对pH敏感性的影响。因此，采用Pt和Ag/AgCl作为基准电极，测量了金刚石溶液栅场效应晶体管的pH响应。我们证明了Pt电极电位本身是pH依赖性的，并且过度补偿了表面电导率的pH敏感性，这显着改变了pH敏感性实验的解释。如果正确地考虑到这种影响，表面上的争议就解决了。实验结果证实，h端金刚石表面电导率的pH敏感性不符合转移掺杂模型的预测。(C) 2008 WILEY-VCH Verlag GmbH & Co., KGaA, Weinheim。
The pH sensitivity of the surface conductivity of H-terminated diamond has been the subject of great controversy, regarding not only its absolute value but even its sign. In this contribution the effect of the reference electrode on the pH sensitivity is investigated. Thus, the pH response of diamond solution-gate field effect transistors using Pt and Ag/AgCl reference electrodes has been measured. We demonstrate that the Pt electrode potential is itself pH dependent and over-compensates the pH sensitivity of the surface conductivity, which alters significantly the interpretation of the pH sensitivity experiments. If this effect is correctly taken into account the apparent controversy is resolved. The experimental results confirm that the pH sensitivity of the H-terminated diamond surface conductivity does not follow the prediction of the transfer doping model. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.