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首页> 外文期刊>Journal of Materials Science >Microwave absorption response of nickel/graphene nanocomposites prepared by electrodeposition
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Microwave absorption response of nickel/graphene nanocomposites prepared by electrodeposition

机译：电沉积制备的镍/石墨烯纳米复合材料的微波吸收响应

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摘要

In this study, nanostructures of nickel have been successfully deposited on graphene nanosheet by direct electrochemical deposition. The morphology, nickel content, and magnetic properties of the graphene as well as composites were examined by scanning electron microscopy, transmission electron microscopic, elemental analysis, and vibrating sample magnetometer, respectively. Their relative complex permeability and permittivity were also measured, and reflection loss values were calculated at given thickness layer according to transmit line theory in the range 2-18 GHz. The results reveal that with the increasing of the thickness of the samples, the matching frequency tends to shift to the lower frequency region, and theoretical reflection loss becomes less at the matching frequency. When the absorbing thickness is 1 mm, the maximum absorption value of graphene is -6.5 dB at about 7 GHz. After decorating graphene sheet with magnetic nickel nanoparticles, the composites were shown to efficiently promote microwave absorbability. When the thickness is 1.5 mm, the absorption value of the composites exceeds -10 dB in the 5 GHz absorbing bandwidth and the maximum absorption value is -16.0 dB at 9.15 GHz.
机译：在这项研究中，镍的纳米结构已通过直接电化学沉积成功地沉积在石墨烯纳米片上。分别通过扫描电子显微镜，透射电子显微镜，元素分析和振动样品磁强计检查了石墨烯以及复合材料的形态，镍含量和磁性。还测量了它们的相对复磁导率和介电常数，并根据2-18 GHz范围内的传输线理论，计算了给定厚度层的反射损耗值。结果表明，随着样品厚度的增加，匹配频率趋向于移向低频区域，并且理论反射损耗在匹配频率下变小。当吸收厚度为1mm时，石墨烯的最大吸收值在约7GHz下为-6.5dB。用磁性镍纳米粒子装饰石墨烯片后，复合材料可有效提高微波吸收能力。当厚度为1.5 mm时，复合材料的吸收值在5 GHz的吸收带宽中超过-10 dB，最大吸收值在9.15 GHz时为-16.0 dB。

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