Journal
APPLIED PHYSICS LETTERS
Volume 87, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2133912
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We report on cathodoluminescence (CL) of monosized and well-aligned 4 angstrom single-walled carbon nanotubes in a zeolite template (AlPO4-5 single crystal). The CL exhibits three emission bands centered at 1.87, 2.22, and 2.98 eV, which are assigned to three possible 4 angstrom tube structures (4,2), (5,0), and (3,3), respectively. The assignation is based on first-principles calculations, Raman scattering measurement, and CL behavior of various samples. The emission peak shift of the (5, 0) tube is explained by the transition mechanism being different from photoluminescence due to the excitation of electrons with high energy. (c) 2005 American Institute of Physics.
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