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李雪琪,李晓杰,王小红,闫鸿浩,曾翔宇.碳包覆坡莫合金纳米颗粒的爆轰法制备及吸波性能研究[J].稀有金属材料与工程(英文),2019,48(5):1657~1663.[Li Xueqi,Li Xiaojie,Yan Honghao,Wang Xiaohong and Pan Xuncen.Formation mechanism and Electromagnetic Microwave Absorbing Properties of Carbon-encapsulated Permalloy Nanoparticles Prepared through Detonation[J].Rare Metal Materials and Engineering,2019,48(5):1657~1663.]
Formation mechanism and Electromagnetic Microwave Absorbing Properties of Carbon-encapsulated Permalloy Nanoparticles Prepared through Detonation
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Received:October 12, 2017  Revised:October 17, 2017
DOI:
Key words: Carbon coating  Fe Ni alloy  Electromagnetic wave absorption  Detonation synthesis  Characterization of nanomaterials
Foundation item:国家自然科学基金资助(项目号11272081, 11672067, 11672068)
Author NameAffiliation
Li Xueqi,Li Xiaojie,Yan Honghao,Wang Xiaohong and Pan Xuncen  
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Abstract:
      Carbon-encapsulated Fe–Ni alloy nanoparticles were synthesized through detonation using safety composite explosive precursors doped with Fe (NO3)3? 9H2O and Ni(NO3)2?6H2O. The morphology, components, and structure of the synthesized carbon-encapsulated alloy nanoparticles were characterized through X-ray diffraction studies, Raman spectroscopy and Transmission electron microscopy attached with energy dispersive X-ray spectroscopy (EDS). Results showed that the carbon-encapsulated Fe–Ni nanoparticles with a core–shell structure. The grains exhibited sizes ranging from 40 nm to 60 nm and were uniformly distributed. The encapsulated metal core was mainly composed of different proportions of Fe and Ni. The outer shell was composed of graphite and amorphous carbon, also there were onion carbon formed by the graphitization of diamond clusters in the vicinity of the nanoparticles. The electromagnetic characteristics of Fe–Ni alloy nanoparticles composites were measured by Agilent microwave network analyzer in the band of 2~ 18 GHz. The experimental results show that, 2 mm in thickness reflection loss R(dB) of the nanoparticles which the atomic ratio of iron and nickel is 1: 4, the absorption layer has double absorption peak, peak values are -14.6dB (9.7GHz) and -7.7dB (14.3GHz), the absorption band ranges of -10dB is from 8.5 to 11.8GHz. The reflection loss R(dB)of the nanoparticles which the atomic ratio of iron and nickel is 1: 1, 2 mm in thickness reaches to 30 dB at 12.88 GHz, the absorption band of -10dB is 9.7 ~ 14.4GHz, which has wide absorption band and excellent absorbing property.