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Reaction pathways for pyridine adsorption on silicon (0 0 1).

J M Bennett1, N A Marks, J A Miwa

  • 1Centre for Quantum Computation and Communication Technology, School of Physics, The University of Sydney, Sydney, NSW 2006, Australia.

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|November 22, 2014
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Summary
This summary is machine-generated.

Density functional theory (DFT) simulations reveal pyridine chemisorption on silicon surfaces. The ωB97X-D functional best describes experimental data, clarifying adsorption structures and transitions.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Computational Chemistry

Background:

  • Understanding pyridine chemisorption on silicon surfaces is crucial for surface science and materials engineering.
  • Previous studies reported conflicting results regarding the dative to tight-bridge transition of pyridine on Si(001).

Purpose of the Study:

  • To investigate the chemisorption of pyridine on the silicon (001) surface using Density Functional Theory (DFT).
  • To determine accurate adsorption and activation energies for relevant surface structures.
  • To clarify the dative to tight-bridge transition and the formation of inter-row chains.

Main Methods:

  • Employing Density Functional Theory (DFT) calculations.
  • Analyzing adsorption energies of six key structures.
  • Calculating activation energies between these structures.
  • Comparing four different DFT functionals, including range-separated hybrids with empirical dispersion.

Main Results:

  • Reported adsorption and activation energies for pyridine on Si(001).
  • Provided a detailed description of the dative to tight-bridge transition, resolving literature discrepancies.
  • Explained the formation of inter-row chains observed in high-coverage experiments.
  • Demonstrated that the DFT functional choice significantly impacts relative energetics.

Conclusions:

  • The range-separated hybrid functional ωB97X-D, with empirical dispersion, offers the most consistent description of experimental data for pyridine chemisorption on Si(001).
  • Accurate DFT functional selection is critical for reliable predictions in surface chemistry.
  • This study clarifies key aspects of pyridine-silicon surface interactions.