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

Abstract Graphene nanoribbons (GNRs) have attracted great research interest because of their widely tunable and unique electronic properties. The required atomic precision GNRs can be realized via on-surface synthesis method. In this work, through a surface assisted reaction we longitudinally fused the pyrene-based graphene (pGNR) different lengths by pentagon ring junction, built molecular junction structure on Au (111). properties are studied scanning tunneling spectroscopy (STS) combined with tight binding (TB) calculations. shows weak coupling effect nanoribbons, which makes two connected analogous to type I semiconductor heterojunctions.