High-density localized spins in helical carbon nanotubes

We performed systematic experiments to qualitatively investigate the localized spins of curved helical graphite carbon nanotubes (HCNTs). Our results show that the HCNTs have strong Curie-like paramagnetism and a high density of localized spins, which can be enhanced further by annealing the as-prepared HCNTs at 500 °C.