Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 25, Issue 49, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/25/49/495506
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Funding
- Spanish MICINN [ENE2010-21198-C04-04, CSD2008-0023]
- European Community's Seventh Framework Programme [312284]
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We have studied the electronic structure of nanocrystalline NiO thin films, grown by radio-frequency magnetron sputtering under different experimental conditions, using x-ray absorption spectroscopy. The O 1s and Ni 2p spectra showed distinct changes as a function of O-2 content in the plasma, which were reproduced with cluster model calculations. These changes are attributed to the incrementing of the surface contribution due to a decrease of the crystallite size as the O-2 content in the plasma increases, and to the presence of induced nickel vacancies. Thus, the changes in the electronic structure can be related to the modification of structural and transport properties of these nanocrystalline films.
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