Lattice structure of self-assembled monolayers of dialkyl sulfides and calix[4]arene sulfide adsorbates on au(111) revealed by atomic force microscopy

Holger Schönherr, Gyula J. Vancso, B.H. Huisman, F.C.J.M. van Veggel, David Reinhoudt

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Abstract

The lattice structure of a variety of self-assembled monolayers (SAMs) on Au(111), derived from dialkyl sulfides and calix[4]arene-based tetrasulfide adsorbates, was elucidated by atomic force microscopy (AFM). SAMs of n-alkanethiols and a fluorinated alkanethiol were imaged as reference layers. The sulfide-based SAMs were annealed at elevated temperatures in order to improve the monolayer quality. AFM revealed depressions with depths of a single or multiple steps in the Au(111) for SAMs of thiols, as well as sulfides. The tail group lattice of dialkyl sulfides has a (V3 × V3)R30 structure identical to that of n-alkanethiols. The results are indicative for the dominating role of intermolecular van der Waals interactions for determining the structure of the dialkyl sulfide-based SAMs. For the calix[4]arene adsorbates the packing of the alkyl chains between the cavity and the substrate could be imaged, which indicates a considerable "information depth" of the AFM measurements. The tilt angle of the alkane segment was found to depend on the rigidity of the cavity.
Original languageUndefined
Pages (from-to)5541-5546
Number of pages6
JournalLangmuir
Volume15
Issue number17
DOIs
Publication statusPublished - 1999

Keywords

  • METIS-105753
  • IR-10619

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