Finely modulating the morphology and composition of Cu(x)Ni(1-x)for enhanced microwave absorption capability
Finely modulating the morphology and composition of Cu(x)Ni(1-x)for enhanced microwave absorption capability
复制标题
精细调控Cu(x)Ni(1-x)的形貌和成分以增强微波吸收能力
DOI：
10.1007/s10853-020-04958-z
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发表时间：
2020
影响因子：
4.5
通讯作者：
Wu Wenhua
中科院分区：
文献类型：
--
作者：
Liu Minmin;Chen Yue;Wei Haiyan;Ke Lifeng;Tong Guoxiu;Wu Wenhua
铜基吸波材料在微波吸收领域的应用不可避免地存在一些缺点（厚度大、质量大、带宽窄），通过对一维结构的形貌和成分进行精细调控可以克服这些缺点。在这里，我们报道了乙二胺操纵原位两步还原反应，这使得可调制备CuxNi 1 −x（x= 0，0.005，0.02，0.0344，0.0934，0.1581，0.2243和1）复合材料具有连续可调的组分和形态从光滑棒到海胆状棒和微球。Ni与Cu复合成CuxNi 1 − x复合材料可以调节晶粒尺寸、内应力、晶格常数、成分、形状以及性能。CuxNi 1 −x（x= 0.0344-0.1581）复合材料在较低的填充质量分数和较薄的样品下表现出比其他Cu基吸收体更强和更宽的吸收带。由于双介电弛豫、双磁共振、高衰减和良好阻抗匹配的综合作用。Cu0.0344Ni0.9656微球具有最佳的微波吸收能力（MACs），在14.74 GHz处的最大RL值为− 67.5 dB，宽频带（99%衰减）为15.41 GHz，对应于1.7-10 mm的样品厚度。CuxNi 1 − x复合材料具有可调的饱和磁化强度和优异的磁性能，是一种很有前途的吸波材料，在电子设备和器件中有着广泛的应用。
Some inevitable disadvantages (being thick and heavy with narrow broadband) restrict the application of Cu-based absorbers in microwave absorption field, which can be overcome by finely modulating the morphology and component of 1D structures. Here, we reported ethylenediamine-steered in situ two-step reduction reactions, which allowed the tunable preparation of CuxNi1−x(x= 0, 0.005, 0.02, 0.0344, 0.0934, 0.1581, 0.2243, and 1) composites with continuously tunable components and morphology varying from smooth rods to urchin-like rods and microspheres. The recombination of Ni with Cu into CuxNi1−xcomposites can tune crystallite size, inner stress, lattice constant, component, shape as well as properties. The CuxNi1−x(x= 0.0344–0.1581) composites exhibited stronger and wider absorption band under a lower filling mass fraction and thinner sample than other Cu-based absorbers. Due to the combined action of double dielectric relaxation, double magnetic resonances, high attenuation, and good impedance match. The optimal microwave absorption capability (MACs) was achieved for Cu0.0344Ni0.9656microspheres with a maximum RL value of − 67.5 dB at 14.74 GHz and a broad frequency band (99% attenuation) of 15.41 GHz, corresponding to 1.7–10 mm sample thickness. Owing to tunable saturation magnetization and excellent MACs, the CuxNi1−xcomposites can work as a kind of promising absorber for applications in electronic equipment and devices.