Growth Processes and Reductive Desorption Behaviors of 4-Fluorobenzenethiol Self-Assembled Monolayers on Au(111)
- Authors
- Seong, Sicheon; Han, Seulki; Son, Young Ji; Lee, Namgyeong; Lee, Gaeun; Hara, Masahiko; Noh, Jaegeun
- Issue Date
- Aug-2020
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Self-Assembled Monolayers; 4-Fluorobenzenethiol; Growth Process; Phase Transition; Reductive Desorption; Scanning Tunneling Microscopy
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.20, no.8, pp.4955 - 4960
- Indexed
- SCIE
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 20
- Number
- 8
- Start Page
- 4955
- End Page
- 4960
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/145284
- DOI
- 10.1166/jnn.2020.17852
- ISSN
- 1533-4880
- Abstract
- Growth processes and electrochemical behaviors of 4-fluorobenzenethiol (4-FBT) self-assembled monolayers (SAMs) on Au(111) prepared by vapor deposition at 323 K were examined using scanning tunneling microscopy (STM) and cyclic voltammetry (CV). STM imaging revealed that 4-FBT SAMs at the initial growth stage (deposition for 1 min) were mainly composed of bright molecular aggregates and liquid-like disordered phase. After longer deposition for 3 min, 4-FBT SAMs had three distinct surface features: a few molecular aggregates, small ordered domains, and disordered phase. These small ordered domains with sizes ranging from 5 to 10 nm had a (4 x root 3)R30 degrees packing structure. As deposition time increased to 24 h, long-range ordered domains larger than 40 nm were formed on Au(111) surfaces. From this STM study, we demonstrate that phase transitions of 4-FBT SAMs on Au(111) occur from molecular aggregates to large ordered domains via formation of small ordered domains as deposition time increases. CV measurements showed reductive desorption peaks for 4-FBT SAMs in the range of -638 similar to -648 mV regardless of SAM morphology, suggesting that S-Au binding strength of 4-FBT SAMs on Au electrodes is a dominant factor for electrochemical stability.
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