Chemisorption Surface Titration and Surface Reconstruction of Alloys
Chemisorption Surface Titration and Surface Reconstruction of Alloys
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合金的化学吸附表面滴定和表面重建
DOI：
10.1116/1.1317795
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发表时间：
1972
期刊：
影响因子：
--
通讯作者：
W. Sachtler
中科院分区：
文献类型：
--
作者：
W. Sachtler
场离子显微镜显示，即使在78 K时，CO和N_2在W上的化学吸附也会导致表面重构。从Ru薄膜的光电子发射可以看出，CO消除了预烧的记忆：不同初始功函数的薄膜产生相同的最终功函数。在30 0 °C以下平衡的几种合金膜具有表面和内部的浓度梯度。通过在CuNi、AgPd或AuPt上化学吸附H2或CO，计算了VIIIB元素的原子。对于因CO而增加的特征功函数，允许估计表面的Ru含量。CO在AuPt和AgPd上的吸附导致了剧烈的表面重建，表面变得更加丰富，与CO形成更强的键的元素使表面变得更加丰富。
Field ion microscopy revealed that chemisorption of CO and N2 on W induces surface reconstruction even at 78 K. Photoelectron emission from Ru films shows that CO wipes out memory of presintering: films of different initial work function yield equal final work function. Several alloy films equilibrated below 300 °C possess concentration gradients between surface and interior. By chemisorbing H2 or CO on CuNi, AgPd or AuPt the atoms of the VIIIb elements are counted. For RuPt the characteristic work function increase due to CO permits an estimation of the Ru content of the surface. CO adsorption on AuPt and AgPd causes drastic surface reconstruction, the surfaces becoming enriched with the element forming the stronger bonds with CO.