Title: Electron spin resonance investigation of ultra-small double walled carbon nanotubes embedded in zeolite nanochannels
Authors: Rao, S.S. ×
Stesmans, Andre
Van Noyen, J.
Jacobs, Pierre
Sels, Bert #
Issue Date: Nov-2011
Publisher: IOP Pub.
Series Title: Journal of Physics - Condensed Matter vol:23 issue:45 pages:455801/1-455801/6
Article number: 455801
Abstract: We report on the low temperature electron spin resonance (ESR) properties of ultra-small (0.45 nm) double walled carbon nanotubes (DWCNTs) embedded in zeolite nanochannels. An isotropic ESR signal is observed at g(c) = 2.002 77 with the spin density (S = 1/2) similar to 10(19) g(-1), which is suggested to originate from the carbon related point defects in the DWCNTs. Measurements of the ESR line width and signal intensity as a function of temperature indicate that the spins are of a localized nature as opposed to the conduction type electrons observed in large diameter CNTs. The results are consistent with the suggestion that electrons are trapped at interstitial defects. The observed linear frequency dependence of the ESR line width of embedded DWCNTs points to 'strain' as the prime source of broadening. By contrast, the study of free standing DWCNTs shows the presence of a distinctly superlinear frequency dependence of the signal width at low temperatures. The possible origin of the frequency dependence is discussed.
ISSN: 0953-8984
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
Semiconductor Physics Section
× corresponding author
# (joint) last author

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