We have investigated the electronic states of highly oriented pyrolitic graphite and single-walled carbon nanotubes using x-ray absorption spectroscopy XAS before and after annealing treatment in ultrahigh vacuum, and observed that the small peak between * and * features, which has been previously assigned to free-electron-like interlayer states, disappears after in situ annealing treatment, suggesting that the signal may be assigned to a surface contamination, especially oxygen contamination introduced by chemical processing or gas adsorption. Additional experiments by photoelectron spectroscopy as well as XAS methods, performed after aging in air, fully support this interpretation.
Abbas, M., Wu, Z., Ibrahim, K., Fiori, A., Orlanducci, S., Sessa, V., et al. (2005). X-ray absorption and photoelectron spectroscopic studies of graphite and single-walled carbon nanotubes: oxygen effect. APPLIED PHYSICS LETTERS, 87, 0519231-0519234 [10.1063/1.2006214].
X-ray absorption and photoelectron spectroscopic studies of graphite and single-walled carbon nanotubes: oxygen effect
ORLANDUCCI, SILVIA;SESSA, VITO;TERRANOVA PERSICHELLI, MARIA LETIZIA;DAVOLI, IVAN
2005-01-01
Abstract
We have investigated the electronic states of highly oriented pyrolitic graphite and single-walled carbon nanotubes using x-ray absorption spectroscopy XAS before and after annealing treatment in ultrahigh vacuum, and observed that the small peak between * and * features, which has been previously assigned to free-electron-like interlayer states, disappears after in situ annealing treatment, suggesting that the signal may be assigned to a surface contamination, especially oxygen contamination introduced by chemical processing or gas adsorption. Additional experiments by photoelectron spectroscopy as well as XAS methods, performed after aging in air, fully support this interpretation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.