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Research Article | Open Access

Molecular heterostructure by fusing graphene nanoribbons of different lengths through a pentagon ring junction

Qiang Sun1,2(), Hao Jiang1, Yuyi Yan1, Roman Fasel2,3, Pascal Ruffieux2()
Materials Genome Institute, Shanghai University, Shanghai 200444, China
Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf 8600, Switzerland
Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Bern 3012, Switzerland
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Through a surface-assisted reaction we have longitudinally fused pyrene-based graphene nanoribbons (pGNR) of different lengths via a 5-membered ring, and electronically characterized the resulting molecular junction.

Abstract

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.

Keywords

graphene nanoribbons (GNRs)scanning tunneling spectroscopy (STS)non-contact atomic force microscopy (nc-AFM)tight-binding (TB) calculationsjunction structure

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Nano Research
Volume 15 Issue 9,
September 2022
Pages 8465-8469
DOI: 10.1007/s12274-022-4410-7
Cite this article:
Sun Q, Jiang H, Yan Y, et al. Molecular heterostructure by fusing graphene nanoribbons of different lengths through a pentagon ring junction. Nano Research, 2022, 15(9): 8465-8469. https://doi.org/10.1007/s12274-022-4410-7
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