In this work, one-dimensional core–shell Cu@Ni nanorods which were anchored on two dimensional reduced graphene oxide (rGO) heterostructures were successfully prepared by a simple co-reduction method. The characteristics of Cu@Ni/rGO composites were measured and collected by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and Raman spectroscopy. The formation mechanisms of these unique Cu@Ni nanorods–rGO heterostructures were discussed in detail. Compared with pure Cu@Ni and rGO, the Cu@Ni/rGO composite showed strong microwave absorption performance with a minimal reflection loss value of −41.2 dB at 8.8 GHz. The excellent microwave absorption properties could be attributed to the suitable impedance match, eddy current loss, multiple reflection and intense interfacial polarization of multiple interfaces existing in Ni/Cu, Cu@Ni/rGO, Ni/rGO, and Cu/rGO systems. The effective bandwidth with a reflection loss lower than −10 dB can be tuned in a frequency range of 3.8–18 GHz with an absorber thickness of 1.0–4.0 mm. This proves that the Cu@Ni/rGO heterostructure is a promising candidate as a highly efficient and lightweight absorber in C (4–8 GHz), X (8–12 GHz) and Ku (12–18 GHz) bands.

中文翻译：

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通过界面工程将一维Cu @ Ni纳米棒固定在二维还原氧化石墨烯上，以增强微波吸收性能

在这项工作中，通过简单的共还原方法成功制备了锚固在二维还原氧化石墨烯（rGO）异质结构上的一维核-壳Cu @ Ni纳米棒。通过X射线衍射，扫描电子显微镜，透射电子显微镜，X射线光电子能谱，傅里叶变换红外光谱和拉曼光谱对Cu @ Ni / rGO复合材料的特性进行了测量和收集。详细讨论了这些独特的Cu @ Ni纳米棒-rGO异质结构的形成机理。与纯Cu @ Ni和rGO相比，Cu @ Ni / rGO复合材料显示出强大的微波吸收性能，在8.8 GHz时的最小反射损耗值为−41.2 dB。优异的微波吸收性能可归因于合适的阻抗匹配，涡流损耗，Ni / Cu，Cu @ Ni / rGO，Ni / rGO和Cu / rGO系统中存在的多个界面的多次反射和强烈的界面极化。反射损耗低于-10 dB的有效带宽可以在3.8–18 GHz的频率范围内，吸收层厚度为1.0–4.0 mm的情况下进行调整。这证明了Cu @ Ni / rGO异质结构有望成为C（4–8 GHz），X（8–12 GHz）和Ku（12–18 GHz）频段上高效，​​轻质的吸收体。