首页> 外文期刊>ACS nano >Interfacial dipole formation and surface-electron confinement in low-coverage self-assembled thiol layers: Thiophenol and p-fluorothiophenol on Cu(111)
【24h】

Interfacial dipole formation and surface-electron confinement in low-coverage self-assembled thiol layers: Thiophenol and p-fluorothiophenol on Cu(111)

机译:低覆盖度自组装硫醇层中的界面偶极形成和表面电子约束:Cu(111)上的硫酚和对氟硫酚

获取原文
获取原文并翻译 | 示例
获取外文期刊封面目录资料

摘要

Model systems of organic self-assembled monolayers are important in achieving full atomic-scale understanding of molecular-electronic interfaces as well as the details of their charge transfer physics. Here we use two-photon photoemission to measure the evolving unoccupied and occupied interfacial electronic structure of two thiolate species, thiophenol and p-fluorothiophenol, adsorbed on Cu(111) as a function of molecular coverage. Our measurements focus on the role of adsorbates in shifting surface polarization and effecting surface electron confinement. As the coverage of each molecule increases, their photoemission-measured work functions exhibit nearly identical behavior up to 0.4-0.5 ML, at which point their behavior diverges; this behavior can be fit to an interfacial bond model for the surface dipole. In addition, our results show the emergence of an interfacial electronic state 0.1-0.2 eV below the Fermi level. This electronic state is attributed to quantum-mechanical-confinement shifting of the Cu(111) surface state by the molecular adsorbates.
机译:有机自组装单分子层的模型系统对于全面了解分子-电子界面及其电荷转移物理学的细节至关重要。在这里,我们使用双光子光发射来测量两个硫醇盐物种(苯酚和对氟苯硫酚)吸附在Cu(111)上作为分子覆盖率的函数的演化的未占据和占据的界面电子结构。我们的测量重点是吸附质在改变表面极化和实现表面电子约束中的作用。随着每个分子的覆盖率的增加,它们的光发射测量功函数表现出几乎相同的行为,直至0.4-0.5 ML,此时它们的行为有所不同。这种行为可以适合表面偶极子的界面键模型。此外,我们的结果表明,在费米能级以下出现了0.1-0.2 eV的界面电子态。该电子态归因于分子吸附物对Cu(111)表面态的量子力学约束移动。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号