Self-assembled monolayers formed by 5,10,15,20-tetra(4-pyridyl)porphyrin and cobalt 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphine on iodine-passivated Au(1 1 1) as observed using electrochemical scanning tunneling microscopy and cyclic voltammetry

Scott N. Thorgaard, Phil Buhlmann

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Self-assembled monolayers (SAMs) of 5,10,15,20-tetra(4-pyridyl)porphyrin (TPyP) and cobalt 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphine (CoTPyP) were formed by in situ equilibrium adsorption onto Au(1 1 1) electrodes passivated by an interposed adlayer of iodine. Adsorption of the porphyrins onto Au(1 1 1) was confirmed by cyclic voltammetry, and each of the SAMs was imaged using electrochemical scanning tunneling microscopy (EC-STM). The TPyP and CoTPyP SAMs were found to contain highly ordered domains on I-Au(1 1 1) at positive potentials where a disordered SAM would be expected for bare Au(1 1 1). Cyclic voltammetry was also used to observe in situ the assembly of binary SAMs containing TPyP and CoTPyP as they formed.

Original languageEnglish (US)
Pages (from-to)94-99
Number of pages6
JournalJournal of Electroanalytical Chemistry
Volume664
DOIs
StatePublished - Jan 1 2012

Keywords

  • Adsorption
  • Au(1 1 1)
  • Cyclic voltammetry
  • Electrochemical scanning tunneling microscopy
  • Porphyrins
  • Self assembled monolayers

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