Formation of large ordered domains in benzenethiol self-assembled monolayers on Au(1 1 1) observed by scanning tunneling microscopy |
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| Authors: | Hungu Kang Taesung Park Inchang Choi Youngil Lee Eisuke Ito Masahiko Hara Jaegeun Noh |
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| Affiliation: | 1. Department of Chemistry, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Republic of Korea;2. Department of Chemistry, Ulsan University, Muger 2-dong, Ulsan 680-749, Republic of Korea;3. Flucto-order Functions Asian Collaboration Team, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;4. Department of Electronic Chemistry, Tokyo Institute of Technology, 4259 Nagatsuta, Midoriku, Yokohama 226-8502, Japan |
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| Abstract: | 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. |
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| Keywords: | 61.16.Ch 68.35.Bs |
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