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Core–shell Cu@Ni chains were successfully synthesized through a mild hydrothermal reaction. The morphology, structure and microwave electromagnetic properties of the composite were then characterized by X-ray diffraction, energy-dispersive spectroscopy, scanning electron microscopy and vector network analysis. The formation mechanisms of the core–shell structure and one-dimensional chains were ascribed to the varying redox potentials of Cu and Ni ions and the magnetic dipole–dipole attraction. Furthermore, a minimal reflection loss (RL) of -20.7 dB was observed at 9.6 GHz with a thickness of 2.0mm and the effective absorption ( ≤10 dB, 90% microwave attenuation) bandwidth can be adjusted between 5.2 GHz and 16.6 GHz for the thin absorber thickness of 2.0–4.0 mm. The novel core–shell chain-like Cu@Ni alloy can be used as a promising absorbing material because it shows numerous features such as thin thickness, strong absorption, low cost and lightweight.
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