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Related Experiment Videos

Diffusion-limited thiol adsorption on the gold(111) surface.

Nicholas Camillone1

  • 1Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973, USA. nicholas@bnl.gov

Langmuir : the ACS Journal of Surfaces and Colloids
|April 5, 2005
PubMed
Summary

The self-assembly of thiol monolayers on gold surfaces is influenced by solution flow rate. This study shows that diffusion, not surface reactions, limits growth at low concentrations and flow rates.

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Area of Science:

  • Surface Science
  • Chemical Kinetics
  • Materials Science

Background:

  • Self-assembly of monolayers (SAMs) is crucial for modifying surface properties.
  • Understanding the kinetics of SAM formation on metal surfaces is essential for controlling material interfaces.

Purpose of the Study:

  • To investigate the kinetics of thiol monolayer self-assembly on Au(111).
  • To determine the factors limiting the adsorption rate, specifically distinguishing between diffusion and surface reaction kinetics.

Main Methods:

  • Utilized optical second harmonic generation (SHG) spectroscopy to monitor monolayer formation in real-time.
  • Systematically varied solution flow rate and thiol concentration during the adsorption process.

Main Results:

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  • Observed a significant dependence of the thiol adsorption rate on the solution flow rate.
  • At low thiol concentrations and low flow rates, the monolayer growth rate was found to be limited by the Nernst diffusion layer.
  • Surface reaction rate kinetics were not the rate-limiting step under these conditions.

Conclusions:

  • The formation of thiol monolayers on Au(111) is governed by mass transport limitations at low concentrations and flow rates.
  • This finding highlights the importance of hydrodynamics in controlling self-assembled monolayer growth.
  • Optical SHG is a powerful tool for probing interfacial reaction kinetics.