Citation: Xue Qiang, Zhang Yajie, Li Ruoning, Li Chao, Li Na, Yuan Chenyang, Hou Shimin, Wang Yongfeng. Self-assembly of L-tryptophan on Cu(111) studied by low-temperature scanning tunneling microscopy[J]. Chinese Chemical Letters, ;2019, 30(12): 2355-2358. doi: 10.1016/j.cclet.2019.09.027 shu

Self-assembly of L-tryptophan on Cu(111) studied by low-temperature scanning tunneling microscopy

Xue Qiang ^a ,
Zhang Yajie ^a ,
Li Ruoning ^a ,
Li Chao ^a ,
Li Na ^a ,
Yuan Chenyang ^a ,
Hou Shimin ^a,b,*, ,
Wang Yongfeng ^a,c,*,

a.
Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, China
b.
Peking University Information Technology Institute (Tianjin Binhai), Tianjin 300450, China
c.
Beijing Academy of Quantum Information Sciences, Beijing 100193, China

smhou@pku.edu.cn

yongfengwang@pku.edu.cn

Received Date: 8 September 2019
Revised Date: 11 September 2019
Accepted Date: 16 September 2019
Available Online: 16 December 2019

Figures(5)

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.
- Scanning tunneling microscopy,
- Tryptophan,
- Self-assembly,
- Surface science,
- Hexamer
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