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Standing-Up Phase of Hexanedithiol Self-Assembled Monolayers on Au(111) Induced by Displacement Reaction

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The surface structure and adsorption condition of self-assembled monolayers (SAM) samples before and after displacement of pre-adsorbed 1-adamantanethiol (ADT) SAMs on Au(111) by 1,6-hexanedithiol (HDT) molecules were characterized by scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). STM imaging revealed that pre-adsorbed ADT SAMs on Au(111) have fully coverage and a well-ordered phase with a (7 × 7) packing structure. However, the ordered phase for pre-adsorbed ADT SAMs was changed to the disordered phase via an intermediate phase consisting of two phases after displacement by HDT molecules. In addition, XPS measurements showed that the intensity of the unbound sulfur peak corresponding to a free—SH group at the outer surface of SAMs on Au(111) increases with increasing displacement time. The relative intensities of the unbound sulfur with respect to the bound sulfur were calculated to be 0.076, 0.147, and 1.095 for displaced SAM samples obtained after displacement of 3 min, 2 h, and 24 h, respectively. This provides strong evidence for the formation of a standing-up phase of HDT SAMs via the displacement process. Our results will provide new insight into controlling the adsorption geometry of alkanedithiol SAMs on Au(111).
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Keywords: 1,6-Hexanedithiol; 1-Adamantanethiol; Displacement; Scanning Tunneling Microscopy; Self-Assembled Monolayers; X-ray Photoelectron Spectroscopy

Document Type: Research Article

Affiliations: 1: Department of Convergence Nanoscience, Hanyang University, Seongdong-gu, Seoul 133-791, Korea 2: Department of Chemistry, Hanyang University, Seongdong-gu, Seoul 133-791, Korea 3: Department of Electronic Chemistry, Tokyo Institute of Technology, 4259 Nagatsuta, Midoriku, Yokohama 226-8502, Japan

Publication date: August 1, 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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