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Crystal Defects on Multi-Walled Carbon Nanotubes by Cobalt Oxide

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This paper reports a new method to make crystal defects on the surface of multi-walled carbon nanotubes (MWCNTs) using the cobalt oxide as the oxidant for breaking carbon surface. The air oxidation of cobalt oxide (CoO) deposited on MWCNTs created various kinds of defects on their surface. Transmission Electron Micrograph (TEM) images showed clear defects such as broken crystal lines and asymmetric wall after air oxidation. X-ray powder diffraction (XRD) data showed that CoO on MWCNTs changed into Co3O4 after air oxidation. After removing Co3O4 from MWCNTs by acid, defective MWCNTs were obtained and showed defects of a clear trace where cobalt oxide had existed. This resulted from the reaction of air oxidation of CoO and carbon reduction of Co3O4, leading to the crystallinity defect of MWCNTs.
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Keywords: COBALT OXIDE; DEFECT; GASIFICATION; METAL OXIDE; MULTI-WALLED CARBON NANOTUBES

Document Type: Research Article

Publication date: 2010-04-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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