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Au(100) as a Template for Pentacene Monolayer.
Artur Trembułowicz1, Agata Sabik1, Miłosz Grodzicki1
1Department of Physics and Astronomy, Institute of Experimental Physics, University of Wrocław, 50-204 Wrocław, Poland.
Molecules (Basel, Switzerland)
|April 30, 2021
Summary
Monolayer pentacene self-assembly on Au(100) reveals new molecular patterns. Pentacene molecules alter the gold surface reconstruction, influencing their arrangement and the underlying gold structure.
Area of Science:
- Surface science
- Materials science
- Nanotechnology
Background:
- The Au(100) surface exhibits a quasi-hexagonal reconstruction.
- Self-assembly of organic molecules on metal surfaces is crucial for nanotechnology.
Purpose of the Study:
- To investigate the self-assembly of pentacene (PEN) on the reconstructed Au(100) surface.
- To understand how pentacene influences the gold surface reconstruction.
Main Methods:
- Scanning tunneling microscopy (STM) at room temperature and ultra-high vacuum.
- Characterization of molecular arrangement and surface structure.
Main Results:
- A novel modulated molecular pattern of pentacene was observed, with molecules aligned along hex stripes.
- Pentacene assembly partially lifted the gold reconstruction, transforming the hex phase to a (1×1) phase.
- The molecular arrangement on the (1×1) gold surface mimicked that on the reconstructed surface.
Conclusions:
- Pentacene self-assembly on Au(100) is sensitive to the surface reconstruction.
- The interaction between pentacene and the gold surface can modify the surface structure.
- STM can distinguish between reconstructed and unreconstructed gold phases based on molecular arrangement and apparent height.
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