Abstract
We describe in this report a wet chemical reduction synthetic strategy for synthesizing urchin-like Ni microspherical structures, in which the nanowires self-assembled by Ni nanoparticles with the size of 5–20[Formula: see text]nm are assembled in a radial form from the center to the surface of the spherical oriented arrays. Urchin-like Ni microspherical structures exhibit the strong magnetic natural resonance peak at 7.0[Formula: see text]GHz and superior magnetic loss at 2–18[Formula: see text]GHz, originated from relatively high anisotropy energy of urchin-like shape. Electromagnetic absorption measurements show that the urchin-like Ni microspherical structures possess outstanding microwave absorption performance at 2–18[Formula: see text]GHz. An optimal reflection loss of [Formula: see text]21.98[Formula: see text]dB can be observed at 17.4[Formula: see text]GHz with a matching thickness of 1.4[Formula: see text]mm and the effective absorption (below −10 dB, 90% absorption) bandwidth is 5 GHz (12–17 GHz) with a thickness of 1.7[Formula: see text]mm. The excellent microwave absorption performance may be attributed to the good impedance, large attenuation constant and novel magnetic loss ability.
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