Accommodation of Lattice Mismatch in a Thiol Self-Assembled Monolayer

Zhe She, Dorothee Lahaye, Neil R. Champness, Michael Buehl, Hicham Hamoudi, Michael Zharnikov, Manfred Buck*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The structure of self-assembled monolayers (SAMs) of 3-(4'-(methylthio)-[1,1'-biphenyl]-4-yl)propane-1-thiol (CH3S(C6H4)(2)(CH2)(3)SH) formed on Au(111)/mica has been investigated by scanning tunneling microscopy (STM), high-resolution X-ray photoemission spectroscopy (HRXPS), near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, and density functional theory (DFT) calculations. A highly crystalline monolayer terminated by thioether moieties is formed, which adopts a structure that differs from the previously studied CH3 terminated analogue with its 2 root 3 X root 3 unit cell. An oblique 2 root 3 X root 61 chiral unit cell containing 8 molecules is proposed Accommodation of the substantial mismatch between the lattices of the SAM and substrate is explained by molecular design. Serving as a buffer layer, the alkane spacer decouples the SAM lattice, defined by the functionalized aromatic moieties, from the substrate.

Original languageEnglish
Pages (from-to)4647-4656
Number of pages10
JournalJournal of Physical Chemistry C
Volume117
Issue number9
DOIs
Publication statusPublished - 7 Mar 2013

Keywords

  • BIPHENYL-BASED THIOLS
  • SCANNING-TUNNELING-MICROSCOPY
  • SPECTROSCOPIC CHARACTERIZATION
  • STRUCTURAL-CHARACTERIZATION
  • THIOAROMATIC MONOLAYERS
  • NEUTRON-DIFFRACTION
  • MOLECULAR STRUCTURE
  • EVAPORATED GOLD
  • SILVER SURFACES
  • AU(111)-(1 X-1)

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