期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 534, 期 -, 页码 110-121出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.09.016
关键词
Thistle-like CoNi; Dielectric Ag decorated graphene; Interfacial polarization; Microwave absorption
资金
- National Natural Science Foundation of China [51672222]
- Doctorate Foundation of Northwestern Polytechnical University [CX201720]
- Spaceflight Foundation of China [2014-HT-XGD]
- Natural Science Basic Research Plan in Shaanxi Province of China [2018JQ5160]
- Fundamental Research Funds for the Central Universities [3102017zy048]
A novel hierarchical composites for coupling thistle-like CoNi with dielectric Ag decorated graphene in paraffin wax as high performance microwave absorber has been synthesized by a facile two-step strategy. The components, particle size, microstructure and morphology of the resulting composites are characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectra, scanning electron microscope, transmission electron microscopy and energy dispersive X-ray spectroscopy, etc. Due to the unique flower structure and good synergistic effect of dielectric loss and magnetic loss, thistle-like CoNi@dielectric Ag decorated graphene composites have showed glorious microwave absorption intensity and frequency width. The maximum reflection loss of 61.9 dB can be gained at 6.96 GHz, which has rarely been reported yet. In addition, the corresponding effective bandwidth with reflection loss less than -10 dB is 5.6 GHz ranging from 12.4 to 18 GHz at only 1.67 mm thickness. This highly efficient and broad band features endow thistle-like CoNi@dielectric Ag decorated graphene composites with promising applications in microwave absorption, electromagnetic shielding, information safety, direct broadcast satellite and military radar fields. (C) 2018 Published by Elsevier Inc.
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