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제안 방법
- From this molecular arrangement, it is clear that the self-assembly process of HUOD molecules physisorbed on graphite is mainly governed by a hydrogen bond without any S-S bond cleavage of the disulfide group, unlike the adsorption process of HUOD molecules on gold. From the investigation of striped phases in HUOD SAMs, we reconfirmed the dissociative adsorption of dialkyl disulfides on gold surfaces from the nanoscopic viewpoint. In fact, our STM results are in accord with previous studies performed by macroscopic techniques.
- In this study, in order to reveal and confirm the self-assembly processes of dilakyl disulfides on gold clearly, we have monitored the striped phases formed by two kinds of unsymmetric dialkyl disulfides on gold and graphite by STM.
- From the nanoscopic viewpoint, we confirmed that the formation of dialkyl disulfide SAMs on gold proceeds via a dissociative adsorption process without direct adsorption of the disulfide group on the gold surface, as revealed mainly by macroscopic techniques. In this study, we have demonstrated that observation of striped phases with a well-designed model compound will provide new guidelines to examine new fundamental aspects such as surface reactions, interactions and orientations of molecules, as well as the monitoring of target molecules on a surface.
- The main object of our study is to clearly elucidate the adsorption processes of dialkyl disulfide from the nanoscopic viewpoint using scanning tunneling microscopy (STM). A few earlier studies have attempted to resolve this problem using dialkyl disulfides with atomic force microscopy (AFM); this work was mainly performed on the fully covered monolayers derived from dialkyl disulfides on the gold surface.
- To understand the self-assembly processes of dialkyl disulfides, we monitored the formation of striped phases appeared during self-assembly of hexyl octadecyl disulfide (HOD) and 1-hydroxyundecyl octadecyl disulfide (HUOD) on both gold and graphite surfaces using scanning tunneling microscopy (STM). From the nanoscopic viewpoint, we confirmed that the formation of dialkyl disulfide SAMs on gold proceeds via a dissociative adsorption process without direct adsorption of the disulfide group on the gold surface, as revealed mainly by macroscopic techniques.
대상 데이터
- After deposition, the substrates were annealed at 350 ºC in a vacuum chamber for 2 h to obtain large, flat, single-crystal terraces. The STM images showed the herringbone reconstruction characteristic of clean Au(111) surfaces on 100-300 nm single-crystal domains. The SAMs were formed by immersing the gold substrates in a freshly prepared 0.
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