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

Schönherr, Holger and Vancso, G. Julius and Huisman, Bart-Hendrik and Veggel van, Frank C.J.M. and Reinhoudt, David N. (1999) Lattice structure of self-assembled monolayers of dialkyl sulfides and calix[4]arene sulfide adsorbates on au(111) revealed by atomic force microscopy. Langmuir, 15 (17). pp. 5541-5546. ISSN 07437463

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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.
Item Type:	Article
Copyright:	© 1999 American Chemical Society
Faculty:	Science and Technology (TNW)
Research Group:	Materials Science and Technology of Polymers (MTP)
Link to this item:	http://purl.utwente.nl/publications/10619
Official URL:	http://dx.doi.org/10.1021/la981787y
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