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Proceedings Paper

Scanning tunneling microscopy and atomic-force microscopy of n-alkanethiolate monolayers spontaneously adsorbed at gold surfaces
Author(s): Carla A. Alves; Earl L. Smith; Cindra A. Widrig; Marc D. Porter
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Paper Abstract

Monolayer films of alkanethiolates CH3(CH2)nSH at Au(111) films on mica were examined by scanning tunneling microscopy (STM) (n equals 1,9,17) and AFM (n equals 1 - 17). The resulting atomically resolved images reveal the packing arrangement of the overlayer. Observed images correspond to a hexagonally packed array of adsorbates with respective nearest- and next-nearest-neighbor spacings of 0.50 +/- 0.02 nm and 0.87 +/- 0.04 nm with STM and 0.52 +/- 0.03 nm and 0.90 +/- 0.04 nm with the AFM. This packing agrees with the expected ((root)3 X (root)3)R30 degree(s) adlayer structure of the adsorbate. We believe the STM images reflect the arrangement near the gold-bound sulfur interface, whereas the AFM images reveal the arrangement of the alkyl chains.

Paper Details

Date Published: 14 May 1992
PDF: 4 pages
Proc. SPIE 1636, Applied Spectroscopy in Materials Science II, (14 May 1992); doi: 10.1117/12.59304
Show Author Affiliations
Carla A. Alves, Iowa State Univ. (United States)
Earl L. Smith, Iowa State Univ. (United States)
Cindra A. Widrig, Iowa State Univ. (United States)
Marc D. Porter, Iowa State Univ. (United States)

Published in SPIE Proceedings Vol. 1636:
Applied Spectroscopy in Materials Science II
William G. Golden, Editor(s)

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