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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Formation and Phase Behaviors of Binary Self-Assembled Monolayers on Au(111) by Coadsorption of Two Thiols with Geometrically Controlled Backbones

등록일
2019년 8월 29일 16시 00분 34초
접수번호
1860
발표코드
PHYS.P-216 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 17일 (목요일) 11:00~12:30
발표형식
포스터
발표분야
Physical Chemistry
저자 및
공동저자
Young Ji Son, Jaegeun Noh*
Department of Chemistry, Hanyang University, Korea
Two-component mixed self-assembled monolayers (SAMs) are especially promising due to their strong potential to tune the physical and chemical properties of surfaces by changing the tail group, length, and chemical structure of the thiol molecular backbone. Therefore, SAMs have been utilized for various practical applications including pH-sensitive supramolecular switches, protein adsorption, organic field-effect transistors, and molecular electronic devices. Mixed SAMs on gold can be readily prepared using three methods: coadsorption of two different thiols, adsorption of asymmetric disulfides, and sequential adsorption. In this study, we investigated the surface morphology of mixed self-assembled monolayers (SAMs) formed by coadsorption of adamantanethiol (ADT) with a spherical cage backbone and other thiols with a different backbone (ethyl, decyl, and phenyl group) in 1:1 molar ratio ethanolic solution using scanning tunneling microscopy (STM) and cyclic voltammetry (CV). We found that phase-separated domains were prominently observed in SAMs formed by coadsorption of ADT and decanethiol, whereas homogeneous surface morphology was formed in SAMs by coadsorption of ADT and ethanethiol, suggesting that the surface structure of SAMs can be easily tuned by changing alkyl chain length of alkanethiols. In addition, structural changes of nano-interface according to the immersion time of each mixed thiol will be discussed in this presentation.

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