Microstructural Heterogeneity for Electrochemical Activity in Polycrystalline Diamond Thin Films Observed by Electrogenerated Chemiluminescence Imaging
Microstructural Heterogeneity for Electrochemical Activity in Polycrystalline Diamond Thin Films Observed by Electrogenerated Chemiluminescence Imaging
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DOI：
10.1021/jp040395z
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发表时间：
2004-09
影响因子：
3.3
通讯作者：
K. H. and;T. Noda;M. Y. and;K. Nakagawa;A. Fujishima
中科院分区：
文献类型：
--
作者：
K. H. and;T. Noda;M. Y. and;K. Nakagawa;A. Fujishima
电致化学发光（ECL）被用来成像的空间变化的电化学活性在重掺杂多晶金刚石表面。[Ru（bpy）3]2+与三丙胺反应生成电化学发光。在多晶金刚石表面的化学发光图案的图像被记录后，用光学显微镜放大，以显示各个活性区域的位置和大小。电化学发光强度的空间分布表明，在多晶金刚石电极的电化学反应是微观不均匀的。以（100）为导向的增长型行业的预期信用损失强度远低于其他增长型行业，并保持在约100%。50%的人（111）部门，即使在潜力的强度达到最大。（100）区的电致发光强度与平均电致发光强度的比值与电位呈线性关系，表明（100）取向的微晶的电导率随电位的升高而升高。
Electrogenerated chemiluminescence (ECL) was used to image the spatial variations in electrochemical activity at the heavily doped polycrystalline diamond surface. ECL was generated by the reaction of [Ru(bpy)3]2+ and tripropylamine. Images of the chemiluminescence patterns at the polycrystalline diamond surface were recorded photographically after magnification with optical microscopy to show the location and size of individual active regions. The spatial distribution for ECL intensity indicated that the electrochemical reactivity at polycrystalline diamond electrodes was microscopically heterogeneous. The ECL intensities for (100)-oriented growth sectors were much lower than those for other growth sectors, and remained at ca. 50% of those for (111) sectors even at the potential at which the intensity reached maximum. The ratios of the ECL intensities for the (100) sector to the average ECL intensities showed a linear relation with the potential, indicating that the conductivity for (100)-oriented microc...