Citation: WANG Li, SHI He-Xia, WANG Wen-Yuan, SHI Hong, SHAO Xiang. Identifying the Hydrogen Bonding Patterns of Melamine and Melem Self-Assemblies on Au(111) Surface[J]. Acta Physico-Chimica Sinica, ;2017, 33(2): 393-398. doi: 10.3866/PKU.WHXB201611033 shu

Identifying the Hydrogen Bonding Patterns of Melamine and Melem Self-Assemblies on Au(111) Surface

WANG Li ^1, ,
SHI He-Xia ¹ ,
WANG Wen-Yuan ¹ ,
SHI Hong ¹ ,
SHAO Xiang ^1,2

1.
Department of Chemical Physics, CAS Key Laboratory of Urban Pollutant Conversion, University of Science and Technology of China, Hefei 230026, P. R. China;
2.
Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, P. R. China

Received Date: 28 October 2016
Revised Date: 2 November 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (91227117, 21333001, 91545128).

Melamine and melem molecules are widely used precursors for synthesizing graphitic carbon nitride (g-C₃N₄), the latter also a hot two-dimensional material with photocatalytic applications. The molecular structures of both are respectively identical to the repeating units of two distinct g-C₃N₄ phases. In this work, the adsorption and self-assembly of melamine and melem on an Au(111) surface were investigated with low-temperature scanning tunneling microscopy (STM). Particularly, the patterns of hydrogen bonds (HBs) in their assemblies were identified and compared. It was found that melamine can only form one type of HB and two kinds of assembly structures, whereas melem can form three types of HBs and six kinds of assembly structures in total. Moreover, the involved HBs can be transformed by tip manipulation. These findings may provide a new strategy for tuning the functionality of surface self-assemblies by manipulating intermolecular hydrogen bonds. This also paves a route for the in situ synthesis of g-C₃N₄ on metallic surfaces and subsequent investigations of their physicochemical properties.
- Melamine,
- Melem,
- Au(111),
- Scanning tunneling microscopy,
- Hydrogen bond,
- Selfassembly
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