期刊
ACS NANO
卷 8, 期 8, 页码 7880-7889出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn501567p
关键词
surface chemistry; polymerization; Au(111); Ullmann coupling; scanning tunneling microscopy; Monte Carlo
类别
资金
- Nanosystems-Initiative Munich Cluster of Excellence
- DFG [DFG LA1842/4-1]
On-surface Ullmann coupling is a versatile and appropriate approach for the bottom-up fabrication of covalent organic nanostructures. In two-dimensional networks however, the kinetically controlled and irreversible coupling leads to high defect densities and a lack of long-range order. To derive general guidelines for optimizing reaction parameters the structural quality of 2D porous covalent networks was evaluated for different preparation protocols. For this purpose, polymerization of an iodine- and bromine-functionalized precursor was studied on Au(111) by scanning tunneling microscopy under ultrahigh vacuum conditions By taking advantage of the vastly different temperature thresholds for C-Br and C-I cleavage, two different polymerization routes were compared - hierarchical and direct polymerization. The structural quality of the covalent networks was evaluated for different reaction parameters, such as surface temperatures heating rates, and deposition rates by statistical analysis of STM data Experimental results are compared to Monte Carlo simulations.
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