Scanning tunneling microscopy study of self-organized Au atomic chain growth on Ge(001)
Scanning tunneling microscopy study of self-organized Au atomic chain growth on Ge(001)
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DOI：
10.1103/physrevb.70.233312
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发表时间：
2004-12-01
影响因子：
3.7
通讯作者：
Altman, EI
中科院分区：
文献类型：
--
作者：
Wang, J;Li, M;Altman, EI
在675 K下，金沉积在Ge（001）上，导致（4x2）和c（8x2）表面的自组织原子链重构。这些链的间距为1.6纳米，最长可达数百纳米。在STM图像中，au诱导的结构域显示交替的白色和灰色链，这可以分别用Au-Au和混合Au-Ge二聚体行来解释。链条呈锯齿状，这是二聚体屈曲的结果。偏置相干STM成像表明金链是金属纳米线。然而，这些链并不是没有缺陷的，并且含有缺失的二聚体空位。毗邻Au纳米线域的Ge阶地含有高密度的（1+2+1）二聚体空位缺陷，这些空位缺陷倾向于沿[100]和[310]方向运行。上述结果与Pt在Ge（001）上得到的结果非常相似，但与Ag（001）的结果非常不同，Ag与Ge（001）仅弱相互作用，因此支持了5d金属的低配位原子比相应的4d金属更强成键的模型。
Gold deposition onto Ge(001) at 675 K led to self-organized atomic chains in (4x2) and c(8x2) surface reconstructions. The chains were separated by 1.6 nm and ran up to several hundred nanometers long. The Au-induced domains showed alternating white and gray chains in STM images that could be explained by Au-Au and mixed Au-Ge dimer rows, respectively. The chains showed a zigzag pattern attributed to dimer buckling. Bias-dependent STM imaging suggested that the Au chains were metallic nanowires. The chains, however, were not defect-free and contained missing dimer vacancies. The Ge terraces adjacent to the Au nanowire domains contained a high density of (1+2+1) dimer vacancy defects that tended to run along [100] and [310] directions. The above results show strong similarities with those obtained for Pt on Ge(001) but are very different from those for Ag, which only weakly interacted with Ge(001), and thus support models suggesting stronger bonding of low-coordinated atoms of the 5d metals compared to the corresponding 4d metals.