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Bio-gel Derived Nickel/Carbon Nanocomposites with Enhanced Microwave Absorption

Abstract

A bio-gel derived strategy is used to construct the Ni/C nanocomposites consisting of a three-dimensional (3-D) carbon networks with embedded nickel nanoparticles. The amorphous carbon prevents the agglomeration of nickel nanoparticles to suppress the eddy current and skin effect. The microwave adsorption properties of the Ni/C nanocomposites are optimized according to percolation theory for good impedance matching. As a result, the microwave absorbing coatings with advantages of thin thickness (1.75 and 1.5 mm) and light weight (25 and 30 wt%) are achieved with excellent absorbing property (90% microwave being absorbed) and broad bandwidth (13.6-18 GHz and 13.2-18 GHz). The absorbing property is mainly attributed to the dielectric relaxation processes in 2-18 GHz from the multilevel interface, porous carbon materials and nanoscaled nickel nanoparticles in the Ni/C nanocomposites. It is believed that this work not only discloses the mechanism of absorption but also provides a new design paradigm for determining the optimal content of absorber using percolation theory. The bio-gel derived strategy paves a possible way for the mass synthesis of microwave absorbers.

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Publication details

The article was received on 02 May 2018, accepted on 11 Jun 2018 and first published on 11 Jun 2018


Article type: Paper
DOI: 10.1039/C8TC02127A
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Bio-gel Derived Nickel/Carbon Nanocomposites with Enhanced Microwave Absorption

    Z. Guo, P. Xie, F. Dang, B. He, J. Lin, R. Fan, C. Hou, H. Liu, J. Zhang and Y. Ma, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC02127A

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