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首页> 外文期刊>Catalysis science & technology >Structural investigation of supported Cu-n clusters under vacuum and ambient air conditions using EXAFS spectroscopy
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Structural investigation of supported Cu-n clusters under vacuum and ambient air conditions using EXAFS spectroscopy

机译：支持的Cu-n结构调查在真空和环境空气条件下的集群使用EXAFS谱

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Extended X-ray absorption fine structure (EXAFS) measurements have been carried out to explore the size-dependent structure of deposited Cu-n clusters using the element-specific K-alpha fluorescence signal of copper. In particular, Cu-55 and Cu-35 have been deposited on a thin natural silica layer of a Si(100) wafer and have been investigated under both ultra-high vacuum and ambient air conditions. Pieces of evidence of an icosahedral structure of Cu-55 and a densely-packed compact fcc-like geometry of Cu-35 are concluded from a comparison of the magnitude EXAFS spectra and FEFF simulations of the geometry of the corresponding free clusters. The exceedingly small radial distances as revealed from the radial distribution plots of the pristine clusters can be explained by a severe increase (similar to 100%) in the scattering phase shift with respect to that of copper bulk. After exposure to ambient atmosphere, the EXAFS signal of "magic" Cu-55 as well as that of Cu-35 exhibits oxidation of the clusters showing a nearest-neighbour radial distance peak which agrees with the Cu-O bond length in amorphous copper hydroxide.
机译：扩展x射线吸收精细结构(EXAFS)测量进行了探讨尺度依赖的Cu-n沉积结构使用特定于元素的K-alpha集群铜的荧光信号。Cu-55和Cu-35沉积薄天然硅层的Si(100)晶片,被调查两种超高真空和环境空气条件。Cu-55和一个二十面体结构紧凑密密麻麻fcc-like Cu-35几何得出结论的比较级吗EXAFS谱和FEFF模拟几何形状相应的免费集群。非常小的径向距离显示的径向分布的阴谋原始集群可以解释为严重在散射增加(类似于100%)相移对铜的体积。在暴露于环境空气、EXAFS信号的“魔法”Cu-55以及Cu-35展品集群显示的氧化近邻径向距离峰值同意Cu-O无定形的键长氢氧化铜。

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