title: Direct imaging of the alkali metal site in K-doped fullerene peapods.
abstract: The structure of K-doped fullerene peapods has been investigated by means of high-resolution transmission electron microscopy and electron energy-loss spectroscopy (EELS). It is proven that the potassium atoms can be doped at the intermolecular sites within C60 peapods. The EELS spectrum of potassium (K) L edge clearly exhibits the feature of K+ in the doped peapod and consequently suggests n-type doping. These results encourage the realization of a one-dimensional superconducting wire based on the nanotube peapods.
authors.affiliation: Department of Chemistry, Peking University, Beijing 100871, People's Republic of China.
authors.forename: Lunhui
authors.initials: L
authors.lastname: Guan
authors.forename: Kazu
authors.initials: K
authors.lastname: Suenaga
authors.forename: Zujin
authors.initials: Z
authors.lastname: Shi
authors.forename: Zhennan
authors.initials: Z
authors.lastname: Gu
authors.forename: Sumio
authors.initials: S
authors.lastname: Iijima