Morphology-Control Synthesis of a Core鈥揝hell Structured NiCu Alloy with Tunable Electromagnetic-Wave Absorption Capabilities

详细信息    查看全文

• 作者：Biao Zhao ; Wanyu Zhao ; Gang Shao ; Bingbing Fan ; Rui Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：June 17, 2015
• 年：2015
• 卷：7
• 期：23
• 页码：12951-12960
• 全文大小：579K
• ISSN：1944-8252

文摘

In this work, dendritelike and rodlike NiCu alloys were prepared by a one-pot hydrothermal process at various reaction temperatures (120, 140, and 160 掳C). The structure and morphology were analyzed by scanning electron microscopy, energy-dispersive spectrometry, X-ray diffraction, and transmission electron microscopy, which that demonstrate NiCu alloys have core鈥搒hell heterostructures with Ni as the shell and Cu as the core. The formation mechanism of the core鈥搒hell structures was also discussed. The uniform and perfect dendritelike NiCu alloy obtained at 140 掳C shows outstanding electromagnetic-wave absorption properties. The lowest reflection loss (RL) of 鈭?1.13 dB was observed at 14.3 GHz, and the effective absorption (below 鈭?0 dB, 90% attenuation) bandwidth can be adjusted between 4.4 and 18 GHz with a thin absorber thickness in the range of 1.2鈥?.0 mm. The outstanding electromagnetic-wave-absorbing properties are ascribed to space-charge polarization arising from the heterogeneous structure of the NiCu alloy, interfacial polarization between the alloy and paraffin, and continuous micronetworks and vibrating microcurrent dissipation originating from the uniform and perfect dendritelike shape of NiCu prepared at 140 掳C.