Journal article

Reversible control of the electronic density of states at the Fermi level of Ca₃Co₄O9+δ misfit-layered oxide single crystals through O⁺/H⁺ plasma exposure

  • Moser, D. Laboratory for Solid State Chemistry and Catalysis, EMPA, Dübendorf, Switzerland
  • Garnier, Michael G. Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
  • Karvonen, L. Laboratory for Solid State Chemistry and Catalysis, EMPA, Dübendorf, Switzerland
  • Shkabko, A. Laboratory for Solid State Chemistry and Catalysis, EMPA, Dübendorf, Switzerland
  • Aebi, Philipp Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
  • Weidenkaff, A. Laboratory for Solid State Chemistry and Catalysis, EMPA, Dübendorf, Switzerland
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    26.09.2012
Published in:
  • Journal of Materials Science. - 2012
English Misfit-layered Ca₃Co₄O₉ crystals were grown and characterized via XRD, SEM, and photo-emission spectroscopy (PES). The evolution of the intensity at the Fermi level (E F) with varying oxygen content was studied by PES. Oxygen species were successfully introduced and removed through O⁺ and H⁺ microwave-plasma (2.45 GHz, 2–5 mbar) treatments, respectively. A 5 min O⁺ plasma exposure was observed to result into a drastic enhancement in the E F intensity, demonstrating the influence of oxygen content to the charge carrier population in layered cobalt-oxide materials.
Faculty
Faculté des sciences
Department
Physique
Language
  • English
Classification
Physics
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Persistent URL
https://folia.unifr.ch/unifr/documents/302629
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