中国物理B ›› 2019, Vol. 28 ›› Issue (7): 76801-076801.doi: 10.1088/1674-1056/28/7/076801

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

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

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

  1. 1 Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou 310027, China;
    2 Collaborative Innovation Center of Advanced Microstructure, Nanjing University, Nanjing 210093, China;
    3 School of Information Science and Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China;
    4 Department of Fundamental and Social Science, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
  • 收稿日期:2019-04-06 修回日期:2019-05-03 出版日期:2019-07-05 发布日期:2019-07-05
  • 通讯作者: Han-Jie Zhang, Pi-Mo He E-mail:zhj_fox@zju.edu.cn;phypmhe@zju.edu.cn
  • 基金资助:

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

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

Li-Wei Jing(井立威)1, Jun-Jie Song(宋俊杰)3, Yu-Xi Zhang(张羽溪)4, Qiao-Yue Chen(陈乔悦)1, Kai-Kai Huang(黄凯凯)1, Han-Jie Zhang(张寒洁)1, Pi-Mo He(何丕模)1,2   

  1. 1 Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou 310027, China;
    2 Collaborative Innovation Center of Advanced Microstructure, Nanjing University, Nanjing 210093, China;
    3 School of Information Science and Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China;
    4 Department of Fundamental and Social Science, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
  • Received:2019-04-06 Revised:2019-05-03 Online:2019-07-05 Published:2019-07-05
  • Contact: Han-Jie Zhang, Pi-Mo He E-mail:zhj_fox@zju.edu.cn;phypmhe@zju.edu.cn
  • Supported by:

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

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[1100] 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 (√19×√19)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.

关键词: self-assembly, ordered superstructure, scanning tunneling microscopy

Abstract:

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[1100] 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 (√19×√19)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.

Key words: self-assembly, ordered superstructure, scanning tunneling microscopy

中图分类号:  (Adsorbate structure (binding sites, geometry))

  • 68.43.Fg
68.37.Ef (Scanning tunneling microscopy (including chemistry induced with STM)) 68.43.-h (Chemisorption/physisorption: adsorbates on surfaces)