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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.
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.
(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.
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.
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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