Acta Phys. -Chim. Sin. ›› 2017, Vol. 33 ›› Issue (3): 627-632.doi: 10.3866/PKU.WHXB201612051

• ARTICLE • Previous Articles     Next Articles

LT-STM Investigation of the Self-Assembled F16CuPc-Corannulene Binary System on Ag (111) and Grap

Rui GUO1,Jialin ZHANG1,2,Songtao ZHAO3,Xiaojiang YU4,Shu ZHONG1,Shuo SUN2,Zhenyu LI3,Wei CHEN1,2,5,6,*()   

  1. 1 Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore
    2 Department of Physics, National University of Singapore, 2 Science Drive 3, 117542, Singapore
    3 Hefei National Laboratory for Physical Sciences at the Microscale, CAS Centre for Excellence and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, P. R. China
    4 Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, 117603, Singapore
    5 Center for Advanced 2D Materials and Graphene Research Center, National University of Singapore, 3 Science Drive 3, 117546, Singapore
    6 National University of Singapore (Suzhou) Research Institute, Suzhou 215123, Jiangsu Province, P. R. China
  • Received:2016-09-29 Published:2017-03-07
  • Contact: Wei CHEN E-mail:phycw@nus.edu.sg
  • Supported by:
    the National Key Basic Research Program of China (973)(2015CB856505);Singapore MOE(MOE, Tier Ⅱ, R143-000-652-112);Singapore NRF-CRP grant of"Doped Contacts and Heterostructures for Solution-Processable Plastic Electronics"(NRF, R143-001-608-281);Jiangsu Province Government Research Platform Grant, China, and NUSRI Seed Fund

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Abstract:

Corannulene (COR) is considered a promising molecular building block for organic electronics owing to its intriguing geometrical and electronic properties. Intensive research efforts have been devoted to understanding the assembly behavior and electronic structure of COR and its derivatives on various metal surfaces via low-temperature scanning tunneling microscopy (LT-STM). Here we report the formation of binary molecular networks of copper hexadecafluorophthalocyanine (F16CuPc)-COR self-assembled on the highly oriented pyrolytic graphite (HOPG) and Ag (111) substrates. Intermolecular hydrogen bonding between F16CuPc and COR facilitates the formation of binary molecular networks on HOPG and further induces a preference for bowl-down configured COR molecules. This observed configuration preference disappears on Ag (111) substrate, where COR molecules lie on the substrate with their bowl openings pointing up and down randomly. We propose that strong interfacial interactions between the molecule and Ag (111) surface constrain the bowl inversion of the COR molecule, which thus retains its initial configuration upon adsorption.

Key words: Molecular assembly, Binary molecular networks, Corannulene, Low-temperature scanning tunneling microscopy, Intermolecular hydrogen bonding