在Pt(111) 上自组装单层:通过扫描道显微镜观察到的分子包装结构和应变效应
Sangyeob Lee1, Jung Park, Regina Ragan
1Department of Chemical Engineering and Materials Science, University of California, Irvine, California 92697, USA.
Journal of the American Chemical Society
|April 28, 2006
概括
在上,自组装的硫醇单层 (SAM) 呈现出独特的超结构. 乙乙醇SAM在Pt(111) 上显示的导电性高于八乙醇SAM,表明可能具有量身定制的电子特性.
科学领域:
- 表面科学是一门科学.
- 纳米技术 纳米技术
- 材料化学 材料化学
背景情况:
- 自组装单层 (SAM) 对于表面功能化至关重要.
- (Pt) 表面在催化和电子学中非常重要.
- 了解Pt(111) 上的分子包装是设备应用的关键.
研究的目的:
- 调查乙醇和乙乙醇SAMS在Pt上的分子排序和电子特性.
- 为了比较Pt{111}上的SAM与之前研究过的Au{111}上的SAM.
- 用扫描道光谱学分析通过这些SAM的电子运输.
主要方法:
- 在超高真空 (UHV) 中,乙醇和乙乙醇SAM在Pt{111}上沉积.
- 在现场扫描道显微镜 (STM) 用于分子结构的高分辨率成像.
- 扫描道光谱 (STS) 用于电子传输测量.
主要成果:
- STM揭示了Pt上的两种醇的局部排序域的超结构马赛克.
- 八乙醇SAMs形成了一个 (√3 × √3) R30°单元细胞;乙乙醇SAMs显示了4 √3 × √3) R30°周期性.
- 在Pt{111}上的SAM显示了与Au{111}相比不同的包装和更少的混乱区域.
- 乙乙醇/Pt(111) 连接显示的导电比八乙醇/Pt(111) 连接更高.
结论:
- Pt(111) 支持有着不同的包装结构的有序SAM.
- 分子结构和基板影响电子传输特性.
- 这些发现为设计表面上的功能分子连接提供了洞察力.
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