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Proton transfer reactions on semiconductor surfaces.

Collin Mui1, Joseph H Han, George T Wang

  • 1Department of Chemical Engineering, Stanford University, Stanford, California 94305-5025, USA.

Journal of the American Chemical Society
|April 11, 2002
PubMed
Summary
This summary is machine-generated.

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Proton affinity on semiconductor surfaces differs between germanium and silicon. Germanium surfaces bind amines molecularly, while silicon surfaces dissociate them, indicating varying proton affinities down a periodic table group.

Area of Science:

  • Surface Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Understanding chemical interactions on semiconductor surfaces is crucial for catalysis and electronics.
  • Amine adsorption behavior on group IV semiconductors like Ge, Si, and C is not fully elucidated.
  • Proton affinity is a key chemical property influencing surface reactions.

Purpose of the Study:

  • To investigate the concept of proton affinity on semiconductor surfaces.
  • To explore the chemistry of amines on Ge(100), Si(100), and C(100) surfaces.
  • To compare the reactivity and adsorption mechanisms of different amines on these surfaces.

Main Methods:

  • Utilized multiple internal reflection Fourier transform infrared (MIR-FTIR) spectroscopy.
  • Employed temperature programmed desorption (TPD) for surface analysis.

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  • Performed density functional theory (DFT) calculations for theoretical predictions.

    • Main Results:

    • Methylamine, dimethylamine, and trimethylamine chemisorbed molecularly on Ge(100) via Ge-N dative bonds.
    • Primary and secondary amines underwent N-H dissociation on Si(100), mimicking proton transfer.
    • Observed a decrease in proton affinity from Ge to Si surfaces, explained by thermodynamics and kinetics.

    Conclusions:

    • The reactivity difference between Ge(100) and Si(100) towards amines reflects a decrease in surface proton affinity down a group.
    • Surface proton affinity is a valid concept for understanding amine chemistry on semiconductors.
    • Theoretical predictions suggest solid-state effects influence proton affinity on C(100) surfaces.