title: Positive electron affinity of fullerenes: Its effect and origin.
abstract: The universal variation pattern of the total energy of various fullerenes including single-walled carbon nanotubes with respect to their extra charge is revealed by the density-functional-theory calculations. The parabolic energy-charge curve with its lowest energy value corresponding to a negatively charged fullerene indicates that these carbon materials have positive electron affinity and are not in the most stable state. The positive electron affinity seems to originate from the pi-electrons and is found to be related to the aggregation property of fullerenes.
authors.affiliation: Department of Electronics, Peking University, Beijing 100871, China.
authors.forename: Ji
authors.initials: J
authors.lastname: Luo
authors.forename: L-M
authors.initials: LM
authors.lastname: Peng
authors.forename: Z Q
authors.initials: ZQ
authors.lastname: Xue
authors.forename: J L
authors.initials: JL
authors.lastname: Wu