TY - JOUR
T1 - Electron spin resonance on single-walled carbon nanotubes obtained from different sources
AU - Abiad Monge, Aida
AU - Ferrer-Anglada, Núria
AU - Roth, Siegmar
N1 - Special Issue: Electronic Properties of Novel Materials (IWEPNM 2010)
PY - 2010
Y1 - 2010
N2 - 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 (ΔHPP), 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.
AB - 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 (ΔHPP), 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.
U2 - 10.1002/pssb.201000231
DO - 10.1002/pssb.201000231
M3 - Article
SN - 0370-1972
VL - 247
SP - 2823
EP - 2826
JO - Physica Status Solidi B
JF - Physica Status Solidi B
IS - 11-12
ER -