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

作　　者：Qiang Sun Hao Jiang Yuyi Yan Roman Fasel Pascal Ruffieux 

机构地区：[1]Materials Genome Institute,Shanghai University,Shanghai 200444,China [2]Empa,Swiss Federal Laboratories for Materials Science and Technology,Dübendorf 8600,Switzerland [3]Department of Chemistry,Biochemistry and Pharmaceutical Sciences,University of Bern,Bern 3012,Switzerland

出　　处：《Nano Research》2022年第9期8465-8469,共5页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(No.22072086);The Swiss National Science Foundation(Nos.200020_182015 and 200021_172527)supported this work。

摘　　要：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.

关 键 词：graphene nanoribbons(GNRs) scanning tunneling spectroscopy(STS) non-contact atomic force microscopy(nc-AFM) tight-binding(TB)calculations junction structure 

分 类 号：O61[理学—无机化学]