Surface Charge—Induced Ordering of the Au(111) Surface
Surface Charge—Induced Ordering of the Au(111) Surface
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表面电荷——Au(111) 表面的诱导有序化
DOI：
10.1126/science.255.5050.1416
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发表时间：
1992
期刊：
影响因子：
56.9
通讯作者：
B. Ocko
中科院分区：
文献类型：
--
作者：
Jia X. Wang;A. Davenport;H. Isaacs;B. Ocko
同步加速器表面 X 射线散射 (SXS) 研究已在 Au(III)/电解质界面进行，以确定表面电荷对金表面原子微观排列的影响。在电化学界面，表面电荷密度可以通过控制施加的电位来连续变化。当改变电极电势时，金原子顶层在 (1 x 1) 本体终止和 (23 x √3) 重构相之间经历可逆相变。为了区分表面电荷和吸附物各自的作用，在 0.1 M NaF、NaCl 和 NaBr 溶液中进行了研究。在所有三种溶液中，相变发生在每个原子 0.07 × 0.02 个电子的感应表面电荷密度下。
Synchrotron surface x-ray scattering (SXS) studies have been carried out at the Au(lll)/electrolyte interface to determine the influence of surface charge on the microscopic arrangement of gold surface atoms. At the electrochemical interface, the surface charge density can be continuously varied by controlling the applied potential. The top layer of gold atoms undergoes a reversible phase transition between the (1 x 1) bulk termination and a (23 x √3) reconstructed phase on changing the electrode potential. In order to differentiate the respective roles of surface charge and adsorbates, studies were carried out in 0.1 M NaF, NaCl, and NaBr solutions. The phase transition occurs at an induced surface charge density of 0.07 � 0.02 electron per atom in all three solutions.