Nanoparticles of Lanthanide Metals and Their Compounds: A Study of Deposition Conditions and Thin Film Formation

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Researchers from Charles University in Prague, Czech Republic, have conducted a study on the preparation of thin films composed of ytterbium (Yb) nanoparticles using a gas deposition technique. The study explored the influence of deposition conditions, such as temperature, time, and gas pressure, on the formation of Yb nanoparticles. The researchers employed atomic force microscopy (AFM) and x-ray reflectivity to analyze the structural properties of the thin films. The results showed that spherical nanoparticles of varying diameters (1-140 nm) can be obtained by depositing Yb in both helium (He) and nitrogen (N-2) atmospheres. The thin films were found to consist of face-centered cubic (fcc) crystals with a small amount of hexagonal close-packed (hcp) phase. The top surface of the films was observed to be covered with an oxide layer due to natural oxidation.

Key Takeaways:

  • Researchers from Charles University used a gas deposition technique to prepare thin films composed of ytterbium (Yb) nanoparticles on a glass substrate.
  • The study explored the influence of deposition conditions, such as temperature, time, and gas pressure, on the formation of Yb nanoparticles.
  • AFM and x-ray reflectivity were employed to analyze the structural properties of the thin films, revealing spherical nanoparticles of varying diameters (1-140 nm) in both He and N-2 atmospheres.
  • The thin films consisted of face-centered cubic (fcc) crystals with a small amount of hexagonal close-packed (hcp) phase.
  • The top surface of the films was covered with an oxide layer due to natural oxidation.
  • The use of N-2 as a gas atmosphere was found to be a feasible alternative to the ordinary gas deposition method with an inert gas like He.
  • Some self-organized hexagonally shaped structures were observed upon deposition in N-2, which were more frequently observed than in He.

Statistics:

  • The diameter of Yb nanoparticles ranged from 1-140 nm.
  • The thickness of the thin films ranged from 5-30 nm.
  • The density of the films ranged from 4-9 g/cm^3.
  • The use of N-2 as a gas atmosphere resulted in the formation of small amounts of nitrides in many cases.

Sources:

  • M. Jerab et al. (2010). Structures of Yb nanoparticle thin films grown by deposition in He and N-2 gas atmospheres: AFM and x-ray reflectivity studies. Journal of Physics - Condensed Matter, 22(47), 74010.
  • Charles University Prague, Faculty of Mathematics and Physics.
  • IOP Publishing Ltd. (Publisher of Journal of Physics - Condensed Matter).
  • Nanotechnology Weekly (via VerticalNews.com).