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Polymorphism in biphenyl-based self-assembled monolayers of thiols
1School of Chemistry, University of St. Andrews, St. Andrews KY16 9ST, UK. pc26@st-and.ac.uk
Annealing self-assembled monolayers (SAMs) of methylbiphenyl thiols on gold surfaces revealed distinct structural changes and enhanced stability. This suggests new ways to control SAM properties by managing competing energetic factors.
Area of Science:
- Surface Science
- Materials Chemistry
- Nanotechnology
Background:
- Self-assembled monolayers (SAMs) are crucial for modifying surface properties.
- Understanding the structural dynamics and stability of SAMs is key for applications.
- Omega-(4'-methylbiphenyl-4-yl) butanethiol is a model system for studying SAM behavior.
Purpose of the Study:
- To investigate the structural polymorphism of omega-(4'-methylbiphenyl-4-yl) butanethiol SAMs on Au(111) upon annealing.
- To correlate structural changes with the stability of the SAMs against thiol exchange.
- To explore new strategies for controlling SAM structure and properties.
Main Methods:
- Scanning tunneling microscopy (STM) for high-resolution surface imaging.
- Contact angle measurements to assess surface wettability and SAM integrity.
- Thermal annealing to induce structural transitions in the SAMs.
Main Results:
- Observed striking polymorphism in the SAM structure upon annealing.
- Demonstrated a switch in SAM stability from unstable to stable against thiol exchange after annealing.
- Identified a highly structurally perfect phase formed above 413 K, stable over large areas (>105 nm2).
Conclusions:
- Annealing provides a route to control the structure and stability of thiol SAMs.
- Competing energetic factors can be leveraged to achieve desired SAM properties.
- Suggests a new dimension in the rational design of functionalized surfaces.
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