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Visible cathodoluminescence from carbon nanotubes: the role of impurities
Author(s) -
Barberio M.,
Barone P.,
Bonanno A.,
Camarca M.,
Oliva A.,
Pingitore V.,
Xu F.
Publication year - 2008
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200778109
Subject(s) - cathodoluminescence , x ray photoelectron spectroscopy , impurity , carbon nanotube , materials science , luminescence , carbon fibers , nickel , analytical chemistry (journal) , oxide , chemical engineering , nanotechnology , chemistry , composite material , metallurgy , optoelectronics , organic chemistry , chromatography , composite number , engineering
Abstract Luminescence spectra obtained by electron bombardment (cathodoluminescence, CL) on bundles of pristine single walled (SWCNT) and multi walled carbon nanotubes (MWCNT) show several common peaks at 1.76, 1.94, 2.06, and 2.22 eV which disappear after heating the samples up to 1300 K. We show that these transitions are extrinsic to nanotubes and originate from nickel oxide impurities, residual catalyst material used in the growth processes. Our conclusions are confirmed by X‐ray photoelectron spectroscopy (XPS) and energy dispersed X‐ray analysis measurements. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)