title: High dielectric loss in graphite-coated Ti nanocapsules.
abstract: Graphite-coated Ti nanocapsules, with Ti nanoparticles as core and onion-like graphite layers as shell, have been prepared by a modified arc-discharge method in ethanol atmosphere, and characterized by means of X-ray diffraction, transmission electron microscopy and Raman spectroscopy. The dielectric properties of the graphite-coated Ti nanocapsules have been investigated in the 2-18 GHz range. An equivalent circuit model was used to interpret the non-linear dielectric resonance behavior of the graphite-coated Ti nanocapsules. The high dielectric loss is mainly attributed to conductance loss and dipole-relaxation loss in the graphite-coated Ti nanocapsules. The graphite-coated Ti nanocapsules exhibit promising properties for application as a new type of shield or absorbent of electromagnetic waves.
authors.affiliation: Shenyang National Laboratory for Material Science, Institute of Metal Research, and International Centre for Material Physics, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People's Republic of China.
authors.forename: X G
authors.initials: XG
authors.lastname: Liu
authors.forename: D Y
authors.initials: DY
authors.lastname: Geng
authors.forename: J J
authors.initials: JJ
authors.lastname: Jiang
authors.forename: J
authors.initials: J
authors.lastname: Du
authors.forename: F
authors.initials: F
authors.lastname: Yang
authors.forename: Z G
authors.initials: ZG
authors.lastname: Xie
authors.forename: D J
authors.initials: DJ
authors.lastname: Kang
authors.forename: Z D
authors.initials: ZD
authors.lastname: Zhang