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XPS and Raman characterization of single-walled carbon nanotubes grown from pretreated Fe2O3 nanoparticles
Birck and NCN Publications
  • Placidus B Amama, Birck Nanotechnology Center, Purdue University
  • Dmitry Zemlyanov, Birck Nanotechnology Center, Purdue University
  • B Sundarakannan, Department of Physics and Institute for Functional Materials, University of Puerto Rico
  • Ram S Katiyar, School of Mechanical Engineering, Purdue University
  • Timothy Fisher, Birck Nanotechnology Center, Purdue University
Abstract

X-ray photoelectron (XPS) and Raman spectroscopic techniques have been used to study the influence of the annealing ambient (N2, Ar and H2) of nearly monodispersed Fe2O3 nanoparticles (mean size = 3.2 ± 1 nm) on the growth of carbon nanotubes by microwave plasma chemical vapour deposition. XPS characterization of the catalytic templates reveals that a N2 ambient reduces sintering of the Fe2O3 nanoparticles and confirms that the chemical phase involved in the nucleation of nanotubes is the metal state Fe0. Multi-excitation wavelength Raman spectroscopy (514, 574, 633 and 785 nm) reveals that the single-walled carbon nanotubes (SWCNTs) grown from N2-annealed catalyst nanoparticles range between 0.8 and 1.1 nm while SWCNTs grown from Ar-annealed catalyst nanoparticles exhibit a broader diameter distribution in the range 0.8–1.8 nm. The narrowness in the distribution of SWCNTs grown from the N2-annealed catalysts has been attributed to the enhanced stability of Fe2O3 nanoparticles in an N2 ambient.

Date of this Version
7-31-2008
Citation
J. Phys. D: Appl. Phys. 41 (2008) 165306 (5pp)
Citation Information
Placidus B Amama, Dmitry Zemlyanov, B Sundarakannan, Ram S Katiyar, et al.. "XPS and Raman characterization of single-walled carbon nanotubes grown from pretreated Fe2O3 nanoparticles" (2008)
Available at: http://works.bepress.com/dmitry_zemlyanov/5/