Formation of large ordered domains in benzenethiol self-assembled monolayers on Au(1 1 1) observed by scanning tunneling microscopy

Benzenethiol (BT) self-assembled monolayers (SAMs) on Au(1 1 1) were prepared as a function of solution temperature after immersion in a 1 mM ethanol solution for 1 day. The surface structures of BT SAMs were examined by means of scanning tunneling microscopy (STM). Although BT molecules usually for...

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Bibliographic Details
Published in:Ultramicroscopy 2009-07, Vol.109 (8), p.1011-1014
Main Authors: Kang, Hungu, Park, Taesung, Choi, Inchang, Lee, Youngil, Ito, Eisuke, Hara, Masahiko, Noh, Jaegeun
Format: Article
Language:English
Subjects:
Benzenethiol
Scanning tunneling microscopy
Self-assembled monolayers
Solution temperature
Structural order
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Summary:Benzenethiol (BT) self-assembled monolayers (SAMs) on Au(1 1 1) were prepared as a function of solution temperature after immersion in a 1 mM ethanol solution for 1 day. The surface structures of BT SAMs were examined by means of scanning tunneling microscopy (STM). Although BT molecules usually form disordered SAMs containing the Au adatom islands at room temperature, we found that they formed two-dimensional ordered SAMs containing a large size domain at a high solution temperature of 50 or 75 °C. High-resolution STM imaging revealed that BT SAMs on Au(1 1 1) formed at 50 °C have a (2×3√2)R23° packing structure. From our STM study, we revealed that two-dimensional ordered BT SAMs on Au(1 1 1) can be obtained by changing the solution temperature.
ISSN:0304-3991
1879-2723
DOI:10.1016/j.ultramic.2009.03.036