Field-Emission Resonances at Tip/α,ω-Mercaptoalkyl Ferrocene/Au Interfaces Studied by STM

Lars Müller-Meskamp, Silvia Karthäuser, Henricus J.W. Zandvliet, Melanie Homberger, Ulrich Simon, Rainer Waser

Research output: Contribution to journalArticleAcademicpeer-review

28 Citations (Scopus)

Abstract

The electrical properties of α,ω-mercaptoalkyl ferrocenes with different alkyl chain lengths embedded in a self-assembled host matrix of alkanethiols on Au(111) are studied by scanning tunneling microscopy and spectroscopy. Based on current–distance spectroscopy, as well as on the evaluation of Fowler–Nordheim tunneling current oscillations, the apparent barrier height of ferrocene is determined independently by two methods. The electronic coupling of the ferrocene moiety to the Au(111) substrate is shown to depend on the length of the alkane-spacer chain. In a double tunnel junction model our experimental findings are explained, addressing the role of the different molecular moieties of the mercaptoalkyl ferrocenes.
Original languageUndefined
Pages (from-to)496-502
Number of pages7
JournalSmall
Volume5
Issue number4
DOIs
Publication statusPublished - 2009

Keywords

  • IR-72780
  • Charge transfer
  • Ferrocene
  • METIS-249962
  • Self-assembled monolayers
  • field-emission resonance
  • Scanning tunneling microscopy

Cite this