通过常压气相沉积制备的五氟苯硫醇自组装单层在 Au(111)上的二维有序排列。

Two-dimensional ordering of pentafluorobenzenethiol self-assembled monolayers on Au(111) prepared by ambient-pressure vapor deposition.

机构信息

Department of Chemistry, Hanyang University, Seoul, Republic of Korea.

出版信息

Ultramicroscopy. 2010 May;110(6):666-9. doi: 10.1016/j.ultramic.2010.02.029. Epub 2010 Feb 24.

DOI:10.1016/j.ultramic.2010.02.029

PMID:20189719

Abstract

Formation and surface structures of pentafluorobenzenethiol (PFBT) self-assembled monolayers (SAMs) on Au(111) prepared by ambient-vapor phase deposition were examined by means of scanning tunneling microscopy (STM) as a function of deposition temperature. PFBT SAMs formed at room temperature have disordered phases with bright aggregated domains, which are very similar to benzenethiol SAMs. As deposition temperature increases to 50 degrees C, partially ordered domains and large aggregated domains appeared. High-resolution STM clearly revealed that PFBT SAMs formed at 75 degrees C were composed of long-range, two-dimensional (2D) ordered domains, which can be described as a c(2x radical3) structure. The results of this study clearly demonstrate that deposition temperature is a crucial factor for obtaining PFBT SAMs on Au(111) with a high degree of structural order.

摘要

在环境气相沉积条件下，通过扫描隧道显微镜（STM）研究了沉积温度对金（111）表面五氟苯硫醇（PFBT）自组装单分子膜（SAM）形成和表面结构的影响。在室温下形成的 PFBT SAM 具有无序相和亮的聚集区，这与苯硫醇 SAM 非常相似。随着沉积温度升高到 50°C，出现了部分有序区域和大的聚集区域。高分辨率 STM 清楚地表明，在 75°C 下形成的 PFBT SAM 由长程、二维（2D）有序区域组成，这些区域可以描述为 c(2x radical3)结构。本研究的结果清楚地表明，沉积温度是获得高度有序结构的金（111）上 PFBT SAM 的关键因素。