Microporous Ni@NiO nanoparticles prepared by chemically dealloying Al 3 Ni 2 @Al nanoparticles as a high microwave absorption material
Microporous Ni@NiO nanoparticles prepared by chemically dealloying Al 3 Ni 2 @Al nanoparticles as a high microwave absorption material
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DOI：
10.1016/j.jmmm.2016.11.093
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发表时间：
2017-03
影响因子：
2.7
通讯作者：
Yu Pang;Xiubo Xie;Da Li;W. Chou;Tong Liu
中科院分区：
文献类型：
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作者：
Yu Pang;Xiubo Xie;Da Li;W. Chou;Tong Liu
采用氢等离子体-金属反应法从Ni 45 Al 55中间合金中制备了Al3Ni2@Al纳米颗粒（NPs），并对其进行了脱合金处理，得到了36 nm的多孔Ni@NiO纳米颗粒。孔径为0.7 ~ 1.6 nm，比表面积为69.5 m2/g，孔容为0.507 cc/g。微孔Ni@NiO纳米颗粒的饱和磁化强度（MS）和磁化率（HC）分别为11.5 emu/g和5.2 Oe。它们具有高微波吸收性能，最小反射系数（RC）为−86.9 dB，在4.5 mm厚度下的吸收带宽为2.6 GHz（RC≤−10 dB）。磁性Ni核和介电NiO壳的协同效应以及纳米结构是复合材料吸波性能提高的主要原因。纳米粒子具有独特的形貌和核/壳结构，为改性微波吸收性能开辟了新的途径。
The Al3Ni2@Al nanoparticles (NPs) were prepared from Ni45Al55master alloy by hydrogen plasma-metal reaction method, and were subsequently dealloyed to produce porous Ni@NiO NPs of 36 nm. The pore size ranges from 0.7 to 1.6 nm, leading to large specific surface area of 69.5 m2/g and big pore volume of 0.507 cc/g. The saturation magnetization (MS) and coercivity (HC) of the microporous Ni@NiO NPs are 11.5 emu/g and 5.2 Oe. They exhibit high microwave absorption performance with a minimum reflection coefficient (RC) of −86.9 dB and an absorption bandwidth of 2.6 GHz (RC≤−10 dB) at thickness of 4.5 mm. The enhanced microwave absorption properties are attributed to the synergistic effect of the magnetic Ni core and dielectric NiO shell, and the micropore architecture. The NPs with micropore morphology and core/shell structure open a new way to modify the microwave absorption performance.