119th General Meeting of the KCS

Type Poster Presentation
Area 물리화학
Room No. 포스터발표장
Time 4월 20일 (목요일) 11:00~12:30
Code PHYS.P-42
Subject Molecular Self-Assembly and Phase Transition of 2,4-Dichlorobenzenethiol on Au(111) Surface
Authors 성시천, 노재근*
한양대학교 화학과, Korea
Abstract Self-assembled monolayers (SAMs) are ultrathin film of organic molecules which are usually consist of head group, backbone spacer and terminal group. They are useful tools for tuning surface properties. Especially, SAMs having aromatic backbone structure with electronegative halogen atoms are useful in electrical applications because of their ability to modify energy barrier of metal surface. Since this energy barrier of surface is significantly affected by density and orientation of the molecular monolayer, it is important to illuminate the packing structure of SAMs. In our previous studies, fluorinated aromatic thiol SAMs showed closely packed domains with intrinsic and specific structures, and its orientation was strongly affected by dipole-dipole intermolecular interactions which are oriented from location of electronegative halogen moieties. Among them, size of ordered domains of 2,4-difluorobenzenethiol (2,4-DFBT) SAMs was overwhelming. In this study, 2,4-dichlorobenzenethiol (2,4-DCBT) was used to confirm dipole-induced organization of halogenated aromatic molecules, which are readily shown in the fluorinated adsorbates. The 2,4-DCBT SAMs was deposited at high temperature (~ 363 K) under atmospheric condition, and characterized by scanning tunneling microscopy (STM) and cyclic voltammetry (CV) to investigate structure and electrochemical behavior of the SAMs.
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