Adsorption behavior of triphenylene on Ru(0001) investigated by scanning tunneling microscopy

作     者：Li-Wei Jing Jun-Jie Song Yu-Xi Zhang Qiao-Yue Chen Kai-Kai Huang Han-Jie Zhang Pi-Mo He 井立威;宋俊杰;张羽溪;陈乔悦;黄凯凯;张寒洁;何丕模

作者机构：Zhejiang Province Key Laboratory of Quantum Technology and Device Department of Physics Zhejiang University Hangzhou 310027 China Collaborative Innovation Center of Advanced Microstructure Nanjing University Nanjing 210093 China School of Information Science and Engineering Ningbo Institute of Technology Zhejiang University Ningbo 315100 China Department of Fundamental and Social Science Zhejiang University of Water Resources and Electric Power Hangzhou 310018 China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2019年第28卷第7期

页      面：407-412页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2017YFB0503100) the National Natural Science Foundation of China(Grant No.11790313) 

主　　题：self-assembly ordered superstructure scanning tunneling microscopy 

摘      要：As a representative of small aromatic molecules, triphenylene(TP) has markedly high carrier mobility and is an ideal precursor for building graphene nanostructures. We mainly investigated the adsorption behavior of TP molecules on Ru(0001) by using scanning tunneling microscopy(STM). In submonolayer regime, TP molecules are randomly dispersed on Ru(0001) and the TP overlayer can be thoroughly dehydrogenated and converted into graphene islands at 700 K. Due to weak interaction between TP molecules and graphene, the grooves formed among graphene islands have confinement effect on TP molecules. TP adopts a flat-lying adsorption mode and has two adsorption configurations with the 3-fold molecular axis aligned almost parallel or antiparallel to the ■ direction of the substrate. At TP coverages of 0.6 monolayer(ML)and 0.8 ML, the orientational distributions of the two adsorption configurations are equal. At about 1.0 ML, we find the coexistence of locally ordered and disordered phases. The ordered phase includes two sets of different superstructures with the symmetries of ■R23.41° and p(4 × 4), respectively. The adsorption behavior of TP on Ru(0001) can be attributed to the delicate balance between molecule–substrate and molecule–molecule interactions.