Scanning tunneling microscopy and atomic-force microscopy of n-alkanethiolate monolayers spontaneously adsorbed at gold surfaces

Carla A. Alves; Earl L. Smith; Cindra A. Widrig; Marc D. Porter

doi:10.1117/12.59304

14 May 1992 Scanning tunneling microscopy and atomic-force microscopy of n-alkanethiolate monolayers spontaneously adsorbed at gold surfaces

Carla A. Alves, Earl L. Smith, Cindra A. Widrig, Marc D. Porter

Author Affiliations +

Proceedings Volume 1636, Applied Spectroscopy in Materials Science II; (1992) https://doi.org/10.1117/12.59304
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

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.

Citation Download Citation

Carla A. Alves, Earl L. Smith, Cindra A. Widrig, and Marc D. Porter "Scanning tunneling microscopy and atomic-force microscopy of n-alkanethiolate monolayers spontaneously adsorbed at gold surfaces", Proc. SPIE 1636, Applied Spectroscopy in Materials Science II, (14 May 1992); https://doi.org/10.1117/12.59304

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