title: A new type of molybdenum oxide crystal encapsulated inside a single-walled carbon nanotube.
abstract: The crystal structure of a new type of molybdenum oxide crystal encapsulated in a single-walled carbon nanotube (CNT) was examined via diffraction and spectroscopic techniques using both X-rays and electron beams. This new type of molybdenum oxide crystal has a chemical bonding state of MoO3, as confirmed by X-ray absorption spectroscopy, and the MoO3 units exhibit axial symmetry, as clarified by electron diffraction from bundled and individual CNTs encapsulating the crystal. To obtain three-dimensional information on the structure, a cross-sectional sample was prepared using a conventional dimple and ion-mill method. High-resolution transmission electron microscopy images exhibit ring-like shapes that originated from the arrangement of the MoO3 units inside the CNTs, as observed along the tube axis. The units are spaced 0.36 nm from each other in a ring arrangement and the distance between each ring is 0.391 nm.
authors.affiliation: Department of Material and Life Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan. sagawa@atom.mls.eng.osaka-u.ac.jp
authors.forename: Ryusuke
authors.initials: R
authors.lastname: Sagawa
authors.forename: Wataru
authors.initials: W
authors.lastname: Togashi
authors.forename: Tomoki
authors.initials: T
authors.lastname: Akita
authors.forename: Yoshizo
authors.initials: Y
authors.lastname: Takai