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Related Experiment Videos

Alkanethiols on platinum: multicomponent self-assembled monolayers.

Dmitri Y Petrovykh1, Hiromi Kimura-Suda, Aric Opdahl

  • 1Physics Department, University of Maryland, College Park, Maryland 20742, Naval Research Laboratory, Washington, D.C. 20375, USA. dmitri.petrovykh@nrl.navy.mil

Langmuir : the ACS Journal of Surfaces and Colloids
|March 8, 2006
PubMed
Summary

Self-assembled monolayers (SAMs) of alkanethiols on platinum films form dense structures. These platinum-bound SAMs are stable for a week but oxidize within a month.

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Area of Science:

  • Surface science
  • Materials science
  • Nanotechnology

Background:

  • Self-assembled monolayers (SAMs) are crucial for surface functionalization.
  • Platinum (Pt) surfaces are widely used in catalysis and electronics.
  • Understanding SAM formation on Pt is key to controlling surface properties.

Purpose of the Study:

  • To investigate the formation and stability of n-alkanethiol SAMs on platinum thin films.
  • To explore the impact of surface preparation and deposition conditions on SAM quality.
  • To characterize the chemical states of sulfur within the SAMs.

Main Methods:

  • X-ray photoelectron spectroscopy (XPS)
  • Reflection-absorption infrared spectroscopy (RAIRS)
  • Spectroscopic ellipsometry (SE)

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  • Contact angle (CA) measurements

    • Main Results:

    • Densely packed alkanethiol SAMs form on piranha-cleaned Pt, with alkyl chains oriented near the surface normal.
    • Monolayers are stable in ambient conditions for about a week, but largely oxidize within a month.
    • Three distinct sulfur states were observed via XPS, indicating alkylthiolate, partially oxidized species, and a chemisorbed species.

    Conclusions:

    • Alkanethiol SAMs on Pt exhibit good initial quality and packing density.
    • The stability of these SAMs in ambient air is limited, with oxidation occurring over weeks.
    • Multiple sulfur binding configurations exist, including chemisorbed species, influencing monolayer properties.