研究目的
Investigating the synthesis and electronic properties of 5-armchair graphene nanoribbons (5-AGNRs) on Ag(111) and Cu(111) surfaces.
研究成果
5-AGNRs were successfully synthesized on Ag(111) but not on Cu(111) due to strong aryl-Cu bonds. The electronic structure of 5-AGNRs on Ag(111) was characterized, revealing an apparent band gap of 1.3 eV. The study provides insights into the substrate effect on the synthesis and electronic properties of graphene nanoribbons.
研究不足
The strong aryl-Cu bonds on Cu(111) lead to disordered structures instead of 5-AGNRs upon high temperature annealing. The electronic properties of 5-AGNRs are influenced by the substrate, requiring further studies for decoupling strategies.
1：Experimental Design and Method Selection:
On-surface synthesis of 5-AGNRs through dehalogenation of 1,4,5,8-tetrabromonaphthalene (TBN) on Ag(111) and Cu(111) surfaces.
2：Sample Selection and Data Sources:
TBN molecules deposited on Ag(111) and Cu(111) surfaces held at room temperature.
3：List of Experimental Equipment and Materials:
Ultra-high vacuum (UHV) chamber, scanning tunneling microscope (STM), organic molecular beam deposition (OMBE) technique.
4：Experimental Procedures and Operational Workflow:
Deposition of TBN molecules, annealing at specific temperatures (420 K and 540 K for Ag(111); 470 K and 600 K for Cu(111)), STM characterization at 77 K.
5：Data Analysis Methods:
Scanning tunneling spectroscopy (STS) measurements to determine electronic properties.
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