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      Transformation of polymer-ZnO core-shell nanofibers into ZnO hollow nanofibers: Intrinsic defect reorganization in ZnO and its influence on the photocatalysis

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      Author
      Kayaci, F.
      Vempati S.
      Ozgit Akgun, C.
      Donmez, I.
      Biyikli, N.
      Uyar T.
      Date
      2015
      Source Title
      Applied Catalysis B: Environmental
      Print ISSN
      0926-3373
      Publisher
      Elsevier
      Volume
      176-177
      Pages
      646 - 653
      Language
      English
      Type
      Article
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      Abstract
      Photocatalytic activity (PCA) on semiconductors is known to be majorly influenced by specific surface area and intrinsic lattice defects of the catalyst. In this report, we tested the efficiencies of 1D ZnO catalysts of varying fiber diameter (80. nm and 650. nm of inner diameter) in two formats, viz. core-shell and hollow nanofibers, where the former is calcined to yield the latter. These nanofibrous catalysts were produced by combining electrospinning and atomic layer deposition processes which were then subjected to thorough characterization including photoluminescence (PL) unveiling the details of intrinsic defects/densities. During the thermal treatment, intrinsic defects are reorganized and as a result a new PL band is observed apart from some significant changes in the intensities of other emissions. The densities of various intrinsic defects from PL are compared for all samples and juxtaposed with the PCA. Careful scrutiny of the various results suggested an anti-correlation between surface area and PCA; i.e., higher surface area does not necessarily imply better PCA. Beyond a limit, the most deterministic factor would be the density of surface defects rather than the specific surface area. The results of this study enable the researchers to fabricate 1D semiconductor photocatalysts while striking the balance between surface area and density of defects.
      Keywords
      Defect density
      Electrospinning
      Hollow nanofibers
      Photocatalysis
      ZnO
      Atomic layer deposition
      Catalysis
      Catalysts
      Defect density
      Electrospinning
      Nanofibers
      Photocatalysis
      Photocatalysts
      Shells (structures)
      Specific surface area
      Spinning (fibers)
      Zinc oxide
      Core-shell nanofibers
      Density of defects
      Fiber diameters
      Hollow nanofibers
      Intrinsic defects
      Photocatalytic activities
      Semiconductor photocatalyst
      ZnO
      Surface defects
      Permalink
      http://hdl.handle.net/11693/20903
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.apcatb.2015.04.036
      Collections
      • Institute of Materials Science and Nanotechnology 1589
      • Nanotechnology Research Center 873

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