Research Article

Nano Research

, Volume 3, Issue 8, pp 604-611

Open Access This content is freely available online to anyone, anywhere at any time.

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

  • Yanfeng ZhangAffiliated withInstitute of Multidisciplinary Research for Advanced Materials, Tohoku UniversityCenter for Nanochemistry, Academy for Advanced Interdisciplinary Studies, Department of Advanced Materials and Nanotechnology, College of Engineering, Beijing University Email author 
  • , Pengfei GuanAffiliated withWPI-Advanced Institute for Materials Research, Tohoku University
  • , Hironari IsshikiAffiliated withInstitute of Multidisciplinary Research for Advanced Materials, Tohoku UniversityDepartment of Chemistry, Graduate School of Science, Tohoku University
  • , Mingwei ChenAffiliated withWPI-Advanced Institute for Materials Research, Tohoku University
  • , Masahiro YamashitaAffiliated withDepartment of Chemistry, Graduate School of Science, Tohoku University
  • , Tadahiro KomedaAffiliated withInstitute of Multidisciplinary Research for Advanced Materials, Tohoku UniversityCREST, Japan Science and Technology Agency (JST) Email author 

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.
http://static-content.springer.com/image/art%3A10.1007%2Fs12274-010-0021-9/MediaObjects/12274_2010_21_Fig1_HTML.gif

Keywords

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