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Nano Research

, Volume 3, Issue 8, pp 604–611 | Cite as

Bis(phthalocyaninato)yttrium grown on Au(111): Electronic structure of a single molecule and the stability of two-dimensional films investigated by scanning tunneling microscopy/spectroscopy at 4.8 K

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Abstract

Scanning tunneling microscopy/spectroscopy (STM/STS) at 4.8 K has been used to examine the growth of a double-decker bis(phthalocyaninato)yttrium (YPc2) molecule on a reconstructed Au(111) substrate. Local differential conductance spectra (dI/dV) of a single YPc2 molecule allow the characteristics of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) to be identified. Furthermore, lateral distributions of the local density of states (LDOS) have also been obtained by dI/dV mapping and confirmed by first principles simulations. These electronic feature mappings and theoretical calculations provide a basis for understanding the unique STM morphology of YPc2, which is usually imaged as an eight-lobed structure. In addition, we demonstrate that bias-dependent STM morphologies and simultaneous dI/dV maps can provide a way of understanding the stability of two-dimensional YPc2 films.

Keywords

Scanning tunneling microscopy/spectroscopy (STM/STS) phthalocyanine electronic structure 
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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • Yanfeng Zhang
    • 1
    • 2
  • Pengfei Guan
    • 3
  • Hironari Isshiki
    • 1
    • 4
  • Mingwei Chen
    • 3
  • Masahiro Yamashita
    • 4
  • Tadahiro Komeda
    • 1
    • 5
  1. 1.Institute of Multidisciplinary Research for Advanced MaterialsTohoku UniversitySendaiJapan
  2. 2.Center for Nanochemistry, Academy for Advanced Interdisciplinary Studies, Department of Advanced Materials and Nanotechnology, College of EngineeringBeijing UniversityBeijingChina
  3. 3.WPI-Advanced Institute for Materials ResearchTohoku UniversitySendaiJapan
  4. 4.Department of Chemistry, Graduate School of ScienceTohoku UniversitySendaiJapan
  5. 5.CREST, Japan Science and Technology Agency (JST)SaitamaJapan

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