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Yuping Sun,Zhengwu Pan,Hongming Long,Siu Wing Or,S. L. Ho,Chao Feng,Xianguo Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.3
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 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 GHz and superior magnetic loss at 2–18 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 GHz. An optimal reflection loss of –21.98 dB can be observed at 17.4 GHz with a matching thickness of 1.4 mm and the effective absorption (below –10 dB, 90% absorption) bandwidth is 5 GHz (12–17 GHz) with a thickness of 1.7 mm. The excellent microwave absorption performance may be attributed to the good impedance, large attenuation constant and novel magnetic loss ability.