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      Analysis of charge transfer for in situ li intercalated carbon nanotubes

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      Author(s)
      Rana, K.
      Kucukayan-Dogu, G.
      Sen, H. S.
      Boothroyd, C.
      Gulseren, O.
      Bengu, E.
      Date
      2012
      Source Title
      Journal of Physical Chemistry C
      Print ISSN
      1932-7447
      Electronic ISSN
      1932-7455
      Publisher
      American Chemical Society
      Volume
      116
      Issue
      20
      Pages
      11364 - 11369
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      Vertically aligned carbon nanotube (VA-CNT) arrays have been synthesized with lithium (Li) intercalation through an alcohol-catalyzed chemical vapor deposition technique by using a Li-containing catalyst. Scanning electron microscopy images display that synthesized carbon nanotubes (CNTs) are dense and vertically aligned. The effect of the Li-containing catalyst on VA-CNTs has been studied by using Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and electron energy loss spectroscopy (EELS). XPS results show the change in binding energy of Li 1s and C 1s peaks, which indicates that Li is inserted in VA-CNTs during growth. Analysis of Raman spectra reveals that the G-band profile of CNTs synthesized with the Li-containing catalyst is shifted, suggesting an electronic interaction between Li and neighboring C atoms of the CNTs. The EELS spectra of the C K edge and Li K edge from CNTs also confirmed that Li is inserted into CNTs during synthesis. We have performed ab inito calculations based on density functional theory for a further understanding of the structural and electronic properties of Li intercalated CNTs, especially addressing the controversial charge-transfer state between Li and C.
      Permalink
      http://hdl.handle.net/11693/21465
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/jp301369u
      Collections
      • Department of Chemistry 640
      • Department of Physics 2397
      • Institute of Materials Science and Nanotechnology (UNAM) 1930
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