Microstructure and electromagnetic characteristics of Ni nanoparticle film coated carbon microcoils
Bi, Hui, Kou, Kai-Chang, Ostrikov, Kostya, Yan, Lu-Ke, & Wang, Zhi-Chao (2009) Microstructure and electromagnetic characteristics of Ni nanoparticle film coated carbon microcoils. Journal of Alloys and Compounds, 478(1-2), pp. 796-800.
Carbon microcoils (CMCs) have been coated with a Ni nanoparticle film using an electroless plating process. The morphology, the elemental composition and the phases in the coating layer, complex permittivity and permeability of the CMCs and Ni-coated CMCs were, respectively, investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and microwave vector network analysis at room temperature. A homogeneous dispersion of Ni nanoparticles on the outer surface of the CMCs was obtained, with a mean particle size of ∼34.4 nm and the phosphorus content of about 8.5 wt%. When comparing the coated and uncoated CMC samples, the real (ε′) and imaginary (ε″) part of the complex permittivity as well as dielectric dissipation factor (tgδε = ε″/ε′) of the Ni-coated CMCs were much smaller, while the real (μ′) and imaginary (μ″) part of the complex permeability and the magnetic dissipation factor (t g σμ = μ″ / μ′) were larger. The enhanced microwave absorption of Ni-coated CMCs resulted from stronger dielectric and magnetic losses. In contrast, the microwave absorption of uncoated CMCs was mainly attributed to the dielectric rather than magnetic losses.
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|Item Type:||Journal Article|
|Keywords:||Carbon microcoils, Chemical vapor deposition, Magnetic properties, Nanocomposites, Scanning electron microscopy|
|Divisions:||Current > QUT Faculties and Divisions > Science & Engineering Faculty|
|Deposited On:||15 Jul 2014 01:38|
|Last Modified:||16 Jul 2014 00:42|
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