Journal
NANO RESEARCH
Volume 15, Issue 9, Pages 8465-8469Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-022-4410-7
Keywords
graphene nanoribbons (GNRs); scanning tunneling spectroscopy (STS); non-contact atomic force microscopy (nc-AFM); tight-binding (TB) calculations; junction structure
Categories
Funding
- National Natural Science Foundation of China [22072086]
- Swiss National Science Foundation [200020_182015, 200021_172527]
- Swiss National Science Foundation (SNF) [200020_182015, 200021_172527] Funding Source: Swiss National Science Foundation (SNF)
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Graphene nanoribbons (GNRs) have unique electronic properties and can be synthesized with atomic precision via on-surface synthesis. In this study, pyrene-based GNRs were longitudinally fused on Au (111) through a surface assisted reaction, forming a molecular junction structure. The electronic properties of the structure were investigated using scanning tunneling spectroscopy (STS) and tight binding (TB) calculations.
Graphene nanoribbons (GNRs) have attracted great research interest because of their widely tunable and unique electronic properties. The required atomic precision of GNRs can be realized via on-surface synthesis method. In this work, through a surface assisted reaction we have longitudinally fused the pyrene-based graphene nanoribbons (pGNR) of different lengths by a pentagon ring junction, and built a molecular junction structure on Au (111). The electronic properties of the structure are studied by scanning tunneling spectroscopy (STS) combined with tight binding (TB) calculations. The pentagon ring junction shows a weak electronic coupling effect on graphene nanoribbons, which makes the electronic properties of the two different graphene nanoribbons connected by a pentagon ring junction analogous to type I semiconductor heterojunctions.
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