121st General Meeting of the KCS

Type Poster Presentation
Area Physical Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code PHYS.P-103
Subject Formation and Phase Behavior of Self-Assembled Monolayers on Au(111) Derived from Unsymmetric Adamantyl Alkyl Disulfides
Authors Young Ji Son, Seul-ki Han, Jaegeun Noh*
Department of Chemistry, Hanyang University, Korea
Abstract Self-assembled monolayers (SAMs) of sulfur-containing organic molecules on metal surfaces are powerful tools for modifying the physical and chemical properties of gold surfaces. It can be applied for various technological fields, such as corrosion prevention, electronic devices, nanopatterning and biosensors. Dialkyl disulfides are one of the most popular molecules for the synthesis of molecular assembly in nano and biotechnology due to the ability to control the degree of phase segregation and preferential adsorption. We synthesized adamantyl hexyl disulfide (AHDS) and adamantyl decyl disulfide (ADDS) and observed the domain structures of these adamantyl alkyl disulfides SAMs on Au(111) including adamantyl group of rigid aliphatic 3D carbon cage structure and alkyl group of flexible carbon chain with different chain length. In this study, we revealed unique structures of these SAMs on Au(111) which have not been observed in each single component SAMs using molecular-scale scanning tunneling microscopy (STM). In the initial process of adsorption, there are two types of separated phases with a (8×6)R20° structure and a (7×6)R40° structure. As immersion time increases, it changed to inhomogeneous mixed phase. Also, we investigated that surface structures of mixed SAMs formed by adsorption of unsymmetric disulfides are different from mixed SAMs formed by coadsorption or displacement method. Structural changes of nano-interface according to the immersion time of disulfides and temperature condition will be discussed in this presentation.
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