负载在球形碳块上的 CoNi 合金纳米粒子增强的微波吸收性能。

Enhanced microwave absorbing performance of CoNi alloy nanoparticles anchored on a spherical carbon monolith.

机构信息

Key Laboratory of Cluster Science, Ministry of Education of China, Department of Chemistry, Beijing Institute of Technology, Beijing 100081, PR China.

出版信息

Phys Chem Chem Phys. 2013 May 28;15(20):7685-9. doi: 10.1039/c3cp50778e. Epub 2013 Apr 17.

DOI:10.1039/c3cp50778e

PMID:23595353

Abstract

CoNi alloy nanoparticles anchored on a spherical carbon monolith (CoNi-C) were prepared by a solvothermal route and subsequent heat treatment without any templates. Their permittivity and permeability behaviors were studied in the frequency range of 2-18 GHz. The CoNi-C composites showed the best microwave absorbing performances compared to those of Co-C and Ni-C. The maximum reflection loss of the CoNi-C nanocomposites can reach -50.2 dB at 7.7 GHz with samples of 4 mm in thickness, better than that of the Ni-C composites, while the Co-C composites showed almost no absorption at all. The absorption mechanism of the three absorbents was also discussed.

摘要

采用溶剂热法和后续热处理制备了负载在球形碳块上的 CoNi 合金纳米粒子（CoNi-C），无需使用任何模板。在 2-18GHz 的频率范围内研究了它们的介电常数和磁导率特性。与 Co-C 和 Ni-C 相比，CoNi-C 复合材料表现出最佳的微波吸收性能。在厚度为 4mm 的样品中，CoNi-C 纳米复合材料在 7.7GHz 时的最大反射损耗可达-50.2dB，优于 Ni-C 复合材料，而 Co-C 复合材料几乎没有吸收。还讨论了三种吸收剂的吸收机制。