Self-assembly of L-tryptophan on Cu(111) studied by low-temperature scanning tunneling microscopy |
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Authors: | Qiang Xue Yajie Zhang Ruoning Li Chao Li Na Li Chenyang Yuan Shimin Hou Yongfeng Wang |
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Institution: | Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, China; Peking University Information Technology Institute(Tianjin Binhai), Tianjin 300450, China; Beijing Academy of Quantum Information Sciences, Beijing 100193, China |
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Abstract: | The self-assembly of L-tryptophan on Cu(111) is investigated by an ultrahigh vacuum scanning tunneling microscope (STM) at 4.4 K. When deposited onto the substrate at around 120 K with a coverage of 0.1 monolayer, molecular trimers, tetramers, hexamers, and chains coexist on Cu(111). Then almost all molecules self-assemble into chiral hexamers after being annealed at room temperature. When increasing molecular coverage to the full layer, a new type of chain is observed on the surface. Based on the high-resolution STM images at sub-molecular level, we suggest that the L-tryptophan molecules are present in neutral, zwitterionic or anionic states in these structures. |
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Keywords: | Scanning tunneling microscopy Tryptophan Self-assembly Surface science Hexamer |
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