期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 6, 期 32, 页码 8812-8822出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc02127a
关键词
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资金
- Qilu Young Scholar Program in Shandong University
- Natural Science Foundation of Shandong Province [ZR2014EMM001, ZR2017BEM018]
- Science and Technology Planning Project of Guangdong Province [2017A010103039]
- Natural Science Foundation of Guangdong Province [2015A030313506]
- National Natural Science Foundation of China [51771108]
A bio-gel derived strategy was used to construct Ni/C nanocomposites consisting of three-dimensional (3-D) carbon networks with embedded nickel nanoparticles. The amorphous carbon prevents agglomeration of the nickel nanoparticles and thus contributes to a good impedance match. The microwave absorption properties of the Ni/C nanocomposites were optimized according to percolation theory for good impedance matching. As a result, microwave absorbing coatings, which have the advantages of thin thickness (1.75 and 1.5 mm) and light weight (25 and 30 wt%), were achieved with excellent absorbing properties (90% microwave absorption) and a broad bandwidth (13.6-18 GHz and 13.2-18 GHz). The absorbing properties were mainly attributed to the dielectric relaxation processes at 2-18 GHz from the multilevel interface, porous carbon materials and nanoscale nickel nanoparticles in the Ni/C nanocomposites. It is believed that this work not only helps to elucidate the mechanism of absorption but also provides a new design paradigm for determining the optimal content of absorbers using percolation theory. The bio-gel derived strategy paves a possible way for the mass synthesis of microwave absorbers.
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