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      Amorphous to tetragonal zirconia anostructures and evolution of valence and core regions

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      Author
      Vempati S.
      Kayaci-Senirmak, F.
      Ozgit-Akgun, C.
      Bıyıklı, Necmi
      Uyar, Tamer
      Date
      2015
      Source Title
      Journal of Physical Chemistry C
      Print ISSN
      1932-7447
      Publisher
      American Chemical Society
      Volume
      119
      Issue
      40
      Pages
      23268 - 23273
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      In this report, we study the evolution of valence band (VB) structure during a controlled amorphous to tetragonal transformation of ZrO2 core-shell nanostructures fabricated from electrospun nanofiber template (at 130, 200, and 250 °C). Shell-ZrO2 was formed with atomic layer deposition. X-ray diffraction and transmission electron microscopy are employed to unveil the transformation of amorphous to crystalline structure of ZrO2. O 1s core-level spectra indicated chemisorbed oxygen (OCh) of almost invariant fraction for the three samples. Zr 3s level suggested that the sample deposited at 130 °C has depicted a peak at relatively higher binding energy. Analyses on Zr 3d spectra indicated the presence of metallic-Zr (Zr+ζ, 0 ≤ |ζ| < 4), the fraction of which decreases with increasing template temperature. VB region is analyzed until ∼64 eV below the Fermi level (EF). The region close to EF depicted features that are dissimilar to the literature. This discrepancy is explained on the basis of the analyses from O 1s, Zr 3d, and Zr 4p levels including hybridization of orbitals from chemisorbed species. These levels were analyzed in terms of peak characteristics such as spectral position, area under the peak, etc. The results of this study would enhance the understanding of the evolution of various bands in the presence of OCh and changes to the crystallinity enabling the functionalities that are not available in the single-phase ZrO2.
      Keywords
      Atomic layer deposition
      Binding energy
      Chemisorption
      High resolution transmission electron microscopy
      Nanostructures
      Transmission electron microscopy
      X ray diffraction
      Zirconia
      Chemisorbed oxygen
      Core shell nano structures
      Core-level spectra
      Crystalline structure
      Crystallinities
      Electrospun nanofibers
      Spectral position
      Tetragonal zirconia
      Zirconium alloys
      Permalink
      http://hdl.handle.net/11693/20748
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/acs.jpcc.5b07904
      Collections
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
      • Nanotechnology Research Center (NANOTAM) 1006
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