Unique Ordered Domains of Biphenylthiol Self-Assembled Monolayers on Au(111)

被引:15
|
作者
Kang, Hungu [1 ]
Shin, Dong Geun [1 ]
Han, Jin Wook [1 ]
Ito, Eisuke [2 ]
Hara, Masahiko [2 ,3 ]
Noh, Jaegeun [1 ]
机构
[1] Hanyang Univ, Dept Chem, Seoul 133791, South Korea
[2] RIKEN, RIKEN HYU Collaborat Ctr, Fluctoorder Funct Res Team, Wako, Saitama 3510198, Japan
[3] Tokyo Inst Technol, Dept Elect Chem, Midori Ku, Yokohama, Kanagawa 2268502, Japan
基金
新加坡国家研究基金会;
关键词
Self-Assembled Monolayers; Biphenylthiol; Structural Order; Scanning Tunneling Microscopy; X-ray Photoelectron Microscopy; SCANNING-TUNNELING-MICROSCOPY; GOLD; ADSORPTION; THIOL; SURFACES; 4-MERCAPTOBIPHENYLS; FORM; STM;
D O I
10.1166/jnn.2012.5379
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The surface structure and adsorption conditions of biphenylthiol (BPT) self-assembled monolayers (SAMs) on Au(111) were examined using scanning tunneling microscopy (STM) and X-ray photoelectron microscopy (XPS). STM imaging revealed that the structural order of BPT SAMs formed in a 0.01 mM ethanol solution at 60 degrees C decreases with increasing immersion time. Interestingly, BPT SAMs formed after 30 min have unique ordered domains containing well-ordered (root 3 x root 3)R30 degrees structures and bright rows that are connected by small aggregated domains with a periodicity of approximately 10 angstrom, results that have never been observed for other thiol SAM systems. Distances between the bright rows were 20-35 angstrom. The bright small domains contained five or six BPT molecules each, which may have originated from differences in the adsorption orientations of biphenyl groups that were induced by localized interactions between them. XPS measurements for BPT SAMs on Au(111) showed the two sulfur peaks at 161.2 and 162.2 eV, implying the formation of chemisorbed monolayers. Our results are anticipated to be useful for understanding the formation and structure of BPT SAMs on gold surfaces.
引用
收藏
页码:557 / 562
页数:6
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