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Surface states and negative electron affinity in polyethylene.

M C Righi1, S Scandolo, S Serra

  • 1International School for Advanced Studies (SISSA) and Istituto Nazionale per la Fisica della Materia, Via Beirut 4, I-34014 Trieste, Italy.

Physical Review Letters
|August 11, 2001
PubMed
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First-principles calculations reveal polyethylene surfaces have negative electron affinity. This finding impacts understanding polyethylene

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Polyethylene is a widely used polymer with applications in high-voltage insulation.
  • Understanding the surface electronic properties of polyethylene is crucial for optimizing its performance.
  • Previous experimental studies suggested negative electron affinity for polyethylene surfaces.

Purpose of the Study:

  • To investigate the electronic properties of polyethylene surfaces using first-principles calculations.
  • To provide theoretical support for experimental observations of negative electron affinity.
  • To explore the implications of surface electronic structure on material properties.

Main Methods:

  • Density Functional Theory (DFT) based first-principles calculations.

Related Experiment Videos

  • Modeling of polyethylene surfaces with varying chain orientations (perpendicular and parallel to the surface normal).
  • Calculation of electron affinity and surface state binding energies.

    • Main Results:

    • Calculated negative electron affinity for polyethylene surfaces: -0.17 eV (chains perpendicular) and -0.10 eV (chains parallel).
    • Identification of a surface state with a binding energy of -1.2 ± 0.5 eV relative to the bulk conduction band minimum.
    • Theoretical confirmation of experimental findings regarding negative electron affinity.

    Conclusions:

    • The electronic properties of polyethylene surfaces, including negative electron affinity, are theoretically validated.
    • The surface electronic states influence spectroscopy, charge transport, and aging in polyethylene.
    • These findings have implications for the use of polyethylene in high-voltage applications.