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Related Experiment Videos

Electron emission from diamondoids: a diffusion quantum Monte Carlo study.

N D Drummond1, A J Williamson, R J Needs

  • 1TCM Group, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom.

Physical Review Letters
|October 4, 2005
PubMed
Summary
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Quantum Monte Carlo calculations reveal diamondoids larger than 1 nm have optical gaps below bulk diamond. These H-terminated carbon nanoparticles exhibit negative electron affinity, suggesting potential as electron emitters.

Area of Science:

  • Computational Materials Science
  • Nanotechnology
  • Quantum Chemistry

Background:

  • Controversies exist regarding the optical properties of hydrogen-terminated carbon nanoparticles (diamondoids).
  • Understanding these properties is crucial for potential applications.
  • Previous studies using density-functional theory (DFT) and quantum Monte Carlo (QMC) have yielded conflicting results.

Purpose of the Study:

  • To resolve experimental and theoretical discrepancies concerning the optical properties of diamondoids.
  • To investigate the size dependence of optical gaps and electronic properties.
  • To explore potential applications based on calculated electronic characteristics.

Main Methods:

  • Employed density-functional theory (DFT) and quantum Monte Carlo (QMC) computational methods.

Related Experiment Videos

  • Performed calculations on hydrogen-terminated carbon nanoparticles (diamondoids) of varying sizes.
  • Analyzed optical gaps, exciton binding energies, and electron affinities.

    • Main Results:

    • QMC calculations align with DFT trends for optical gap size dependence but predict higher values (1-2 eV).
    • Quantum confinement effects diminish in diamondoids exceeding 1 nm, with optical gaps falling below that of bulk diamond.
    • Diamondoids up to 1 nm show a small exciton binding energy and a negative electron affinity (NEA) due to delocalized lowest unoccupied molecular orbitals.

    Conclusions:

    • QMC calculations provide a more accurate description of diamondoid optical properties.
    • The observed negative electron affinity in smaller diamondoids opens possibilities for their use.
    • Diamondoids show promise as low-voltage electron emitters.