ESR investigations on polyethylene-single wall carbon nanotube composites
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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.
KeywordsCarbon Nanotubes Electron Spin Resonance Electron Spin Resonance Spectrum HDPE Resonance Line
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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