Complex Structural Dynamics at Adsorbed Alkanethiol Layers at Au(111) Single-Crystal Domains
Complex Structural Dynamics at Adsorbed Alkanethiol Layers at Au(111) Single-Crystal Domains
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Au(111) 单晶域吸附烷硫醇层的复杂结构动力学
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
A. Arvia
中科院分区：
文献类型：
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作者：
F. Arce;M. E. Vela;R. Salvarezza;A. Arvia
用原位和非原位扫描隧道显微镜（STM）观察了298 K时吸附在Au（111）上的十二硫醇和丁硫醇单层膜的结构和动力学。结果表明，在发生单原子深坑聚簇的气态初始吸附阶段之后，发生层结构变化p（n × 1）⇒（√3 ×√3）R30°⇔c（4x2）的高级吸附阶段。第一个变化被解释为吸附分子从fcc到hcp位点的运动，第二个变化被解释为吸附分子从空心到桥位的波动。吸附区结构的波动与单原子深坑尺寸的波动同时发生。这些过程揭示了298 K下Au（111）上烷烃硫醇层表面动力学的复杂性。
The structure and dynamics of dodecanethiol and butanethiol monolayers adsorbed on Au(111) at 298 K have been followed by in situ and ex situ scanning tunneling microscopy (STM). Results show that a gaslike initial adsorption stage where monatomic deep pit clustering occurs is followed by an advanced adsorption stage in which adlayer structural changes p(n × 1) ⇒ (√3 × √3)R30° ⇔ c(4x2) take place. The first change is interpreted as the motion of adsorbed molecules from fcc to hcp sites, and the second one is explained by the fluctuations of adsorbed molecules from hollow to bridge sites. The structural fluctuations at adsorbate domains occur simultaneously with fluctuations in the size of monatomic deep pits. These processes reveal the complexity of surface dynamics of alkanethiol adlayers on Au(111) at 298 K.