Electron spin resonance investigations on single wall carbon nanotubes dispersed in polyethylene are reported. Three resonance lines were observed; a wide line assigned to magnetic iron clusters (catalyst residues), a broad and intense line originating from uncoupled electrons delocalized over the conducting domains of carbon nanotubes (in interaction with the electronic spins assigned to magnetic impurities), and a faint line superimposed on the broad one, assigned to paramagnetic impurities. The temperature dependence of resonance line parameters (resonance line position, width, and double integral) in the range 150-450 K has been analyzed. It was observed that the parameters of the broad and narrow lines are sensitive to the glass and melting relaxations occurring within the polymeric matrix.
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Acknowledgements This work was supported by NSF Grant # DMR 0606224 (University of Texas pan American), NASA # NCC-01-0203 Grant and NCC-9-114 (Rice University), and US ARMY STTR #A2-1299 grant. The STTR #A2 1299 grant has been awarded to the Chemistry Department of Indiana University (Bloomington) and to PartTec Ltd.
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering