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Optimal electromagnetic-wave absorption by enhanced dipole polarization in Ni/C nanocapsules
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10.1063/1.4747811
/content/aip/journal/apl/101/8/10.1063/1.4747811
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/8/10.1063/1.4747811
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Figures

Image of FIG. 1.
FIG. 1.

Microstructure of Ni/C nanocapsules. (a) TEM image of sample S1 and (b)–(d) HRTEM images of samples S1, S2, and S3 with graphite shell thicknesses of 2 nm, 4 nm, and 9 nm, respectively. The insets of (b) and (c) show HRTEM images of the Ni core and the graphite shell.

Image of FIG. 2.
FIG. 2.

Ensemble average of both the shell thickness and the core magnetism of Ni/C nanocapsules. (a) and (b) DSC (blue line) and TGA (red line) curves of the samples S1 and S3, and (c) magnetic hysteresis loops at 295 K for samples S1–S3, showing similar magnetic properties of the Ni core.

Image of FIG. 3.
FIG. 3.

(a)–(c) Frequency dependence of RL of S1, S2, and S3 for different values of the thickness d of the absorbing layer and (d) comparison of the match frequency and RL values of S1, S2, and S3 at different d values.

Image of FIG. 4.
FIG. 4.

Permittivity ε and permeability μ of the samples S1, S2, and S3. (a) and (b) Frequency dependence of the real and imaginary parts of ε and (c) frequency dependence of the real and imaginary parts of μ.

Image of FIG. 5.
FIG. 5.

Increase of the permittivity with increasing thickness of the graphite shell. The solid line represents a fit to the experimental data (red star with error bar) based on the Bruggeman theory. The inset shows the uniform structure that mimics the Ni/C nanocapsule core/shell structure.

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/content/aip/journal/apl/101/8/10.1063/1.4747811
2012-08-23
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optimal electromagnetic-wave absorption by enhanced dipole polarization in Ni/C nanocapsules
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/8/10.1063/1.4747811
10.1063/1.4747811
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