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Strong microwave absorption of Fe@SiO2 nanocapsules fabricated by one-step high energy plasma
Javid, Muhammad; Zhou, Yuanliang; Wang, Dongxing; Liang, Jingshuang; Li, Da; Shi, Guimei; Shah, Asif; Zhou, Lei; Zhang, Xuefeng; Dong, Xinglong; Zhang, Zhidong
2019-06-01
Source PublicationJOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
ISSN0022-3697
Volume129Pages:242-251
AbstractHerein, the spherical Fe@SiO2 nanocapsules (NCs) has been synthesized by a one-step way of DC arc-discharge plasma under a mixture atmosphere of H-2 and Ar. The high energy states of excited ions (Ar, H, Fe, Si) within plasma region are in situ recorded by online optical emission spectroscopy (OES) and become visible evidence for the energy conditions in the fabrication of Fe@SiO2 NCs. It indicates that the evaluated electron temperature of plasma reaches up to 3 x 10(4) K (similar to 2.6 eV) and can significantly influence the characters of the final product of Fe@SiO2. Magnetic measurement reveals that Fe@SiO2 NCs is dominant ferromagnetism exhibiting partial transition into superparamagnetism at T-B = 160 K. Electromagnetic parameters (permittivity, permeability) in frequency range of 2-18 GHz show that an appropriate impedance matching has been established in Fe@SiO2/paraffin composite, which brings about excellent reflection loss (RL) of -6/.6 dB at 9.3 GHz with thickness of 2.81 mm, and a wide bandwidth from 6 to 18 GHz with RL <= - 10 dB. The significant impact of a SiO2 layer on the electromagnetic performances of Fe@SiO2 NCs has been emphasized here, with respect to behaviors of the counterpart, i.e. pure Fe nanoparticles (NPs).
KeywordFe@SiO2 NCs Fe NPs Arc-plasma Magnetic behavior Electromagnetic parameter Reflection loss
Indexed BySCI
Language英语
WOS IDWOS:000466250300030
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81051
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Javid, Muhammad,Zhou, Yuanliang,Wang, Dongxing,et al. Strong microwave absorption of Fe@SiO2 nanocapsules fabricated by one-step high energy plasma[J]. JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS,2019,129:242-251.
APA Javid, Muhammad.,Zhou, Yuanliang.,Wang, Dongxing.,Liang, Jingshuang.,Li, Da.,...&Zhang, Zhidong.(2019).Strong microwave absorption of Fe@SiO2 nanocapsules fabricated by one-step high energy plasma.JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS,129,242-251.
MLA Javid, Muhammad,et al."Strong microwave absorption of Fe@SiO2 nanocapsules fabricated by one-step high energy plasma".JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 129(2019):242-251.
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