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| - Electron Spin Resonance Studies of Hydrogen Adsorption on Defect-Induced CarbonNanotubes
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| - Multi-walled carbon nanotubes were subjected to harsh acid treatment for subsequently increasing periodsof time. Transmission electron micrographs show that metallic particles are largely removed in this processand that nanofibers are preferentially destroyed. Acid treatment induces defects through segmentation of thetube walls. These changes were studied using electron spin resonance spectroscopy, and the response of thedefects to hydrogen adsorption was monitored over a temperature range from ambient to 5 K. The interactionof hydrogen mainly with defects is manifested in the largest increase in signal amplitude for the sample withthe most defects and in the increase of the spin lattice relaxation time at temperature below 10 K.
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