Reconstruction at ordered Au(110)-aqueous interfaces as probed by atomic-resolution scanning tunneling microscopy.
Reconstruction at ordered Au(110)-aqueous interfaces as probed by atomic-resolution scanning tunneling microscopy.
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通过原子分辨率扫描隧道显微镜探测有序 Au(110)-水界面的重建。
DOI：
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发表时间：
1991
期刊：
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通讯作者：
Weaver
中科院分区：
文献类型：
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作者：
Gao;Hamelin;Weaver
有序金（110）在0.1M水溶液中的原子分辨率扫描-隧道显微镜图像 ${\mathrm{HClO}}_{4}$，作为电极电位的函数，提供了异常详细的表面重建图像。与饱和甘汞电极（SCE）相比，将新退火表面的电位降低至-0.3，产生的图像主要由具有(1)的域组成\ifmmode\times\else\texttimes\fi{}2)对称。而(1)\ifmmode\times\else\texttimes\fi{}2)结构显示出与通常的“缺行”模型相称的原子密度，图像表明顶层和第二层原子都发生了明显的弛豫。三个原子宽的条带，沿着[11 .\ifmmode\bar\else\textasciimacron\fi{}[0]方向，被视为提供重建的基本构件；这些单元也产生(1)的“加行”域\ifmmode\times\else\texttimes\fi{}N)对称，N =3或更高。重构被解除，得到(1)\ifmmode\times\else\texttimes\fi{}1) Au（110）表面，快速（内） \ensuremath{\sim}2 s)当电位改变到0 V vs SCE时，但在返回到-0.3 V时立即重新出现。
Atomic-resolution scanning-tunneling-microscopy images of ordered Au(110) in aqueous 0.1M ${\mathrm{HClO}}_{4}$, reported as a function of electrode potential, provide an unusually detailed picture of surface reconstruction. Lowering the potential of a freshly annealed surface to -0.3 versus saturated calomel electrode (SCE) yield images consisting primarily of domains having (1\ifmmode\times\else\texttimes\fi{}2) symmetry. While the (1\ifmmode\times\else\texttimes\fi{}2) structure exhibits an atomic density commensurate with the usual ``missing-row'' model, the images suggest that significant relaxation of both top- and second-layer atoms occurss. Three-atom-wide ribbons, lying along the [11\ifmmode\bar\else\textasciimacron\fi{}0] direction, are seen to provide the basic building blocks of the reconstruction; these units also yield ``added-row'' domains of (1\ifmmode\times\else\texttimes\fi{}n) symmetry, with n=3 or higher. The reconstruction is lifted, yielding the (1\ifmmode\times\else\texttimes\fi{}1) Au(110) surface, rapidly (within \ensuremath{\sim}2 s) upon altering the potential to 0 V vs SCE, yet reappears immediately upon returning to -0.3 V.