Formation and Structural Changes of 4-Fluorobenzenethiol Self-Assembled Monolayers on Au(111)
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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Scanning Tunneling Microscopy;
Document Type: Research Article
Department of Chemistry, Hanyang University, Seongdong-gu, Seoul 133-791, Korea
Institute of Fusion Science, Department of Chemistry Education, Chonbuk National University, Jeonbuk 560-756, Korea
Department of Electronic Chemistry, Tokyo Institute of Technology, 4259 Nagatsuta, Midoriku, Yokohama 226-8502, Japan
Publication date: August 1, 2017
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