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Related Experiment Videos

Quantum confinement effect on Gd2O3 clusters.

B Mercier1, G Ledoux, C Dujardin

  • 1LPCML CNRS UMR 5620, Université de Lyon, Université Claude Bernard Lyon I, 10 rue A. M. Ampère, 69622 Villeurbanne Cedex, France.

The Journal of Chemical Physics
|February 9, 2007
PubMed
Summary
This summary is machine-generated.

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The band gap of gadolinium oxide (Gd(2)O(3)) nanoparticles shifts to blue with size reduction, mimicking semiconductor behavior despite its ionic nature. This indicates significant electron delocalization due to covalency.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Gadolinium oxide (Gd(2)O(3)) is an insulator with potential applications in nanotechnology.
  • Understanding the size-dependent properties of nanomaterials is crucial for their technological integration.

Purpose of the Study:

  • To investigate the evolution of the band gap in nanoscaled Gd(2)O(3) as a function of particle size.
  • To compare the behavior of this ionic material with that of covalent semiconductors.

Main Methods:

  • Synthesis of Gd(2)O(3) nanoparticles using low-energy cluster beam deposition.
  • Post-synthesis annealing to control nanoparticle growth.
  • Characterization of the band gap using vacuum ultraviolet excitation spectra with europium (Eu(3+)) as a dopant.

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Main Results:

  • Observed a blue shift in the band gap of Gd(2)O(3) nanoparticles with decreasing size.
  • The observed size-dependent band gap evolution follows an empirical rule typically seen in semiconductors.
  • Despite its high ionic character (0.9 on the Phillips scale), Gd(2)O(3) exhibits behavior similar to covalent materials.

Conclusions:

  • The band gap evolution in nanoscaled Gd(2)O(3) is significantly influenced by quantum confinement effects.
  • The material's behavior suggests a notable degree of covalency, leading to electron-hole delocalization.
  • This finding broadens the understanding of electronic properties in oxide nanomaterials and their parallels with semiconductors.