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Electron Quantization in Metal Nanoparticles

Quantization phenomena in metal nano-particles

  • Linear Au-chains on alumina films
  • Planar Au-islands on MgO films
  • Oxide supported metal particles with less than 100 atoms develop quantized electronic structure and gaps at the Fermi level
  • Resulting quantum well states often compatible with simple particles-in-the-box-models

 

Linear Au-chains on alumina films

  • Electron transfer from oxide support into ad-gold leads to growth of monatomic chains with pronounced standing wave patterns 
  • Symmetry and energy of quantum well states reveals number of atoms and of transfer-electrons in the Au chains

https://uol.de/fileadmin/_processed/3/f/csm_Au-Kette_9b676575ec.jpg

Topographic images of Au chains on alumina (top) and corresponding quantum well states (middle: experiment, bottom: calculation)

For details: Counting transfer electrons through alumina films, Nilius et al., Phys. Rev. Lett. 100 (2008) 096802.

 

Planar Au-islands on MgO films

  • Development of 2D Au-islands due to electron-transfer from the MgO film (0.2|e| per interface atom)
  • Observation of quantum well states with increasing number of nodal planes (eigenstates of a parabolic potential)

https://uol.de/fileadmin/_processed/6/b/csm_Au-Insel_1_801c26d7dc.pnghttps://uol.de/fileadmin/_processed/e/7/csm_Au-Insel_2_28647cef14.pnghttps://uol.de/fileadmin/_processed/a/e/csm_Au-Insel_3_33bacc07b8.png

HOMO, morphology and LUMO (left to right) of an 18-atom Au-island

For details: Quantum well states in two-dimensional gold clusters on MgO films, Lin et al., Phys. Rev. Lett. 102 (2009) 206801.

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