title: Fabrication of ion-induced carbon-cobalt nanocomposite fibers: effect of cobalt supply rate.
abstract: Graphite surfaces were irradiated by argon (Ar+) ions at 1 keV with a simultaneous cobalt (Co) supply at room temperature. Various kinds of carbon nanocomposites, such as nanocones with and without single nanofibers on their tops, nanorods and fish-scale-like nanoprotrusions, were formed depending on Co supply rates. It has been observed that with increasing the Co supply rate the formation of nanoprotrusions without nanofibers became prominent. Both nanofibers and nanoprotrusions were surely composed of carbon and Co, as confirmed by energy-dispersive X-ray analysis. The cobalt carbon nanocomposite fibers (CCNFs), -1.5 microm in average length, were grown on the top of the nanocones at the Co supply rate of 1.0 nm/min. The field electron emission characteristics of CCNFs thus grown indicated that there is an optimum parameter for the CCNF growth to achieve the better emission performance than that of pristine Ar(+)-induced carbon nanofibers.
authors.affiliation: Department of Frontier Materials, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan.
authors.forename: Zhipeng
authors.initials: Z
authors.lastname: Wang
authors.forename: Mohd Zamri Mohd
authors.initials: MZ
authors.lastname: Yusop
authors.forename: Takehiko
authors.initials: T
authors.lastname: Hihara
authors.forename: Pradip
authors.initials: P
authors.lastname: Ghosh
authors.forename: Akari
authors.initials: A
authors.lastname: Hayashi
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Hayashi
authors.forename: Masaki
authors.initials: M
authors.lastname: Tanemura