Facile Fabrication of Extremely Small CoNi/C Core/Shell Nanoparticles for Efficient Microwave Absorber

Facile Fabrication of Extremely Small CoNi/C Core/Shell Nanoparticles for Efficient Microwave Absorber
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轻松制造极小的 CoNi/C 核/壳纳米粒子,用于高效微波吸收器

DOI:
10.1142/s1793292019500905
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发表时间:
2019-08
期刊:
影响因子:
1.2
通讯作者:
Wang Shiliang
Wang Shiliang
中科院分区:
材料科学4区
文献类型:
--
作者:
Wen Xiang;Hou Lizhen;Deng Lianwen;Kuang Daitao;Luo Heng;Wang Shiliang

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ConI磁性纳米颗粒及其杂化结构在众多应用领域引起了极大的关注。在本研究中,开发了一种基于一步金属-有机化学气相沉积(MOCVD)的简便方法来制备极小的核尺寸[公式:见文本]3.7[公式:见文本]nm和超薄壳层厚度1-3[公式:见文本]nm的CONI/C核/壳纳米粒子。只有厚度为1.6[公式:见文本]mm的10[公式:见文本]wt.%CONI/C核/壳NP填充复合材料的最佳反射损耗值为25.7[公式:见文本]分贝和高达6.2[公式:见文本]GHz的吸收带宽值。与相对较大的核壳纳米粒子相比,极小的核壳纳米粒子具有更高的电磁参数(即复介电常数和磁导率)、反射损耗和更宽的有效吸收带宽。良好的吸波性能应归功于比表面积的增大和界面极化的丰富。所合成的极小的CONI/C核/壳纳米粒子有望成为轻薄高效吸波材料的候选材料。
CoNi magnetic nanoparticles (NPs) and hybrid architectures have attracted tremendous attention from numerous applications. In this study, a facile approach based on one-step metal-organic chemical vapor deposition (MOCVD) was developed to fabricate CoNi/C core/shell NPs with an extremely small core size of [Formula: see text]3.7[Formula: see text]nm and an ultrathin shell thickness of 1–3[Formula: see text]nm. Only 10[Formula: see text]wt.% CoNi/C core/shell NP-filled composites with thickness of 1.6[Formula: see text]mm exhibit an optimal reflection loss value of [Formula: see text]25.7[Formula: see text]dB and an absorbing bandwidth value up to 6.2[Formula: see text]GHz. The extremely small core/shell NPs are demonstrated to have enhanced electromagnetic parameters (i.e., complex permittivity and permeability), reflection loss and broadened effective absorption bandwidth, as compared to the relatively larger NPs. The superior microwave absorbing performance should be attributed to the increased specific area with enriched interfacial polarization. The as-synthesized extremely small CoNi/C core/shell NPs are expected to be a fascinating candidate for efficient microwave absorption material with lightweight and thin thickness.
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