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Size-dependent properties extend to amorphous materials. Surface analysis of amorphous aluminum oxide films revealed distinct atomic arrangements, confirming surface effects in amorphous nanometric materials.

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Physical properties of nanocrystalline materials are size-dependent due to surface effects.
  • Theoretical models suggest similar size effects may exist in amorphous materials.

Purpose of the Study:

  • To investigate the existence of size-dependent surface effects in amorphous materials.
  • To probe the local atomic environment of amorphous aluminum oxide thin films as a function of depth.

Main Methods:

  • Amorphous aluminum oxide thin films were fabricated using atomic layer deposition (ALD).
  • X-ray Absorption Near Edge Structure Spectroscopy (XANES) in grazing incidence geometry was employed.
  • XANES data was analyzed as a function of grazing angle to probe depth-dependent structural changes.

Main Results:

  • The fraction of Al6 sites was significantly lower at the surface compared to deeper within the film.
  • The surface of the amorphous aluminum oxide films was found to be relatively enriched in Al4 sites.
  • Depth-profiling analysis revealed variations in the local aluminum coordination environment.

Conclusions:

  • The study provides experimental evidence for size effects in amorphous nanometric materials.
  • Surface atomic arrangements in amorphous materials differ from the bulk, similar to nanocrystalline counterparts.
  • Findings enhance understanding of the structure-property relationships in amorphous thin films.