A thiol-substituted carotenoid self-assembles on gold surfaces

Dezhong Liu, Gregory J. Szulczewski, Lowell D. Kispert, Alex Primak, Thomas Moore, Ana Moore, Devens Gust

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Abstract

A thiol-substituted carotenoid, 7′-apo-7′-(4-mercaptomethylphenyl)-β-carotene, (AMC) was allowed to selfassemble on polycrystalline gold surfaces. The stability, packing density, optical absorption, and hydrophobicity of the resulting monolayers were investigated with X-ray photoelectron spectroscopy (XPS), Fourier transform infrared reflection-absorption spectroscopy (FTIR-RAS), UV-Vis spectroscopy, spectroscopic ellipsometry, and contact angle measurements. XPS and spectroscopic ellipsometry measurements reveal the saturation coverage is ∼4 × 1014 AMC molecules/cm2 and the film thickness is ∼20 Å, respectively. FTIR-RAS and contact angle measurements suggest that the polyene chains are packed well enough to create a hydrophobic interface.

Original languageEnglish (US)
Pages (from-to)2933-2936
Number of pages4
JournalJournal of Physical Chemistry B
Volume106
Issue number11
DOIs
Publication statusPublished - Mar 21 2002

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Liu, D., Szulczewski, G. J., Kispert, L. D., Primak, A., Moore, T., Moore, A., & Gust, D. (2002). A thiol-substituted carotenoid self-assembles on gold surfaces. Journal of Physical Chemistry B, 106(11), 2933-2936. https://doi.org/10.1021/jp011876a