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Formation and Structural Changes of 4-Fluorobenzenethiol Self-Assembled Monolayers on Au(111)

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The surface structure and electrochemical behavior of 4-fluorobenzenethiol (4-FBT) self-assembled monolayers (SAMs) on Au(111) formed by vapor deposition at 323 K as a function of deposition time were examined by scanning tunneling microscopy (STM) and cyclic voltammetry (CV) measurements. STM observations clearly revealed that 4-FBT SAMs after 10 min or 6 h deposition were composed of disordered and ordered domains containing many gold adatom islands. The size of ordered domains with a molecular row structure was also relatively small, ranging from 10 to 50 nm. After longer deposition for 24 h, the structural quality of 4-FBT SAMs was greatly enhanced with large ordered domains (>50 nm) and without gold adatom islands. CV measurements demonstrated that the blocking efficiency of the electrodes for redox reactions increased with the improvement in the structural quality of 4-FBT SAMs on Au(111), consistent with the STM results. Our results obtained here will be very useful in understanding the formation of 4-FBT SAMs on Au(111) and obtaining the high-quality SAMs.
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Keywords: Cyclic Voltammetry; Fluorobenzenethiols; Scanning Tunneling Microscopy; Self-Assembled Monolayers; Structural Order

Document Type: Research Article

Affiliations: 1: Department of Chemistry, Hanyang University, Seongdong-gu, Seoul 133-791, Korea 2: Institute of Fusion Science, Department of Chemistry Education, Chonbuk National University, Jeonbuk 560-756, 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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