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Electron spin resonance on single‐walled carbon nanotubes obtained from different sources
Author(s) -
FerrerAnglada Núria,
Monge Aida Abiad,
Roth Siegmar
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201000231
Subject(s) - electron paramagnetic resonance , carbon nanotube , raman spectroscopy , spectral line , materials science , impurity , line (geometry) , resonance (particle physics) , electron , spin (aerodynamics) , spectroscopy , ion , nuclear magnetic resonance , analytical chemistry (journal) , atomic physics , chemistry , nanotechnology , physics , optics , organic chemistry , geometry , mathematics , astronomy , quantum mechanics , thermodynamics
Abstract We used electron spin resonance (ESR) to analyze several kinds of single‐walled carbon nanotubes (SWNTs) synthesized by different methods. We observed that ESR is a sensitive probe that can be used to observe major differences between samples of carbon nanotubes (CNTs), in relation to their proportion of magnetic catalysts, impurities or defects. We analyzed the ESR spectra of CNTs in the usual way, by three overlapping lines. We then, implemented a function to fit the spectra, which gave us the intensity, line width (Δ H PP ), and resonance line position ( g factor) of each component line. The asymmetric line, which is assigned to the conduction electrons, could be used as a fingerprint of CNT purity. However, this asymmetric line is not always observed, since the three ESR lines often overlap, particularly when there is a large amount of paramagnetic ions. We studied the ESR spectra for different samples and estimated their purity by comparing the resulting parameters with data obtained by Raman spectroscopy on the same samples.