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Synthesis and Characterization of Self-Assembled Metal-Organic Framework Monolayers Using Polymer-Coated Particles
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Polymorphism in self-assembled terphenylthiolate monolayers on Au(111).

Asif Bashir1, Waleed Azzam, Michael Rohwerder

  • 1Max-Planck-Institut für Eisenforschung GmbH , Max-Planck-Straße 1, 40237 Düsseldorf, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 3, 2013
PubMed
Summary

Annealing terphenylthiol (TPT) self-assembled monolayers on gold substrates forms two ordered phases. Understanding these structures, the alpha and beta phases, is key to consistent spectroscopic results.

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Area of Science:

  • Surface science
  • Nanotechnology
  • Materials chemistry

Background:

  • Self-assembled monolayers (SAMs) are crucial for modifying surfaces.
  • Terphenylthiol (TPT) on gold (Au(111)) is a model system for studying SAMs.
  • Previous studies reported discrepancies in TPT SAM structures.

Purpose of the Study:

  • To investigate the ordered structures of TPT SAMs on Au(111) after annealing.
  • To resolve discrepancies in reported TPT SAM structures.
  • To understand the factors influencing spectroscopic variability.

Main Methods:

  • High-resolution scanning tunneling microscopy (STM).
  • Annealing TPT SAMs on Au(111) in ethanol at 40 °C.
  • Structural analysis of observed phases.

Main Results:

  • Two distinct ordered phases (α and β) were identified.
  • The α-phase exhibits a (2√3 × √3)R30° structure, distinct from the hexagonal (√3 × √3)R30°.
  • The β-phase shows a stripe pattern (4 × n) with lower packing density, potentially involving disulfide or S-Au-S motifs.

Conclusions:

  • Annealing promotes the formation of well-ordered TPT SAMs.
  • The coexistence of α and β phases explains past variability in spectroscopic data.
  • Phase proportion directly influences average thickness and tilt angles.