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Enhanced microwave absorption performance of highly dispersed CoNi nanostructures arrayed on graphene

机译:石墨烯上高度分散的CoNi纳米结构的增强的微波吸收性能

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摘要

Magnetic metals (Fe, Co, Ni) and alloys thereof are easily synthesized as nanoparticles, but obtaining highly dispersed graphene-based magnetic nanomaterials remains challenging. Here, three CoNi/graphene nanocomposites (CoNi/GN) are successfully assembled for the first time via a one-pot strategy without templating by manipulating the reaction time and solvents used for the same precursors. Moreover, the reduction of graphene oxide utilizing this method is more effective than that by conventional methods and the alloy particles are firmly embedded on the GN substrate. Compared to n- and p-CoNi/GN nanocomposites, o-CoNi/GN nanocomposites show the best electromagnetic wave absorption properties with the maximum reflection loss of -31.0 dB at 4.9 GHz for a thickness of 4 mm; the effective absorption bandwidth (< 10.0 dB) is 7.3 GHz (9.5-16.8 GHz) for a thickness of 2 mm. The structures and electromagnetic wave absorption mechanisms of the three composites were also investigated. This research provides a new platform for the development of magnetic alloy nanoparticles in the field of microwave-absorbing devices.
机译:磁性金属(Fe,Co,Ni)及其合金易于合成为纳米颗粒,但是获得高度分散的基于石墨烯的磁性纳米材料仍然具有挑战性。在这里,通过单罐策略首次成功组装了三种CoNi /石墨烯纳米复合材料(CoNi / GN),而无需通过操纵相同前体的反应时间和溶剂进行模板化。此外,使用该方法还原氧化石墨烯比通过常规方法还原氧化石墨烯更有效,并且合金颗粒牢固地嵌入在GN基板上。与n和p-CoNi / GN纳米复合材料相比,o-CoNi / GN纳米复合材料显示出最佳的电磁波吸收特性,在4.9 GHz的厚度为4 mm的情况下,最大反射损耗为-31.0 dB。对于2 mm的厚度,有效吸收带宽(<10.0 dB)为7.3 GHz(9.5-16.8 GHz)。还研究了三种复合材料的结构和电磁波吸收机理。该研究为微波吸收装置领域中磁性合金纳米粒子的开发提供了新的平台。

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  • 来源
    《纳米研究(英文版)》 |2018年第5期|2689-2704|共16页
  • 作者单位

    State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;

    Beijing Key Laboratory of Energy Conversion and Storage Materials and College of Chemistry, Beijing Normal University, Beijing 100875, China;

    Beijing Key Laboratory of Energy Conversion and Storage Materials and College of Chemistry, Beijing Normal University, Beijing 100875, China;

    State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;

  • 收录信息 中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
  • 原文格式 PDF
  • 正文语种 eng
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  • 入库时间 2022-08-19 03:47:26
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