Abstract
The core–shell structured Ni/ZnO mixture with excellent microwave absorbing (MA) capability was prepared through a facile solvothermal reduction technique. The crystallographic structure, morphology and MA performance of Ni/ZnO composites were measured by X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM) and Vector network analyzer (VNA), respectively. The smooth Ni microspheres were coated by densely ZnO particles and the Ni/ZnO mixture was shown the best MA properties while the concentration of Zn2+ was 0.017 M. When the absorption layer thickness was only 2.0 mm, the optimal reflection loss (RL) can be reached − 45.4 dB at 14.8 GHz. At this time, the value of RL < − 10 dB was found in the range of 12.6–17.2 GHz. It is demonstrated that the as-synthesized Ni/ZnO composites can be expected to be candidates for a new generation of absorbing materials.
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