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Single-source-precursor synthesis and electromagnetic properties of novel RGO-SiCN ceramic nanocomposites

Abstract

Single-source-precursors (SSPs) were synthesized through chemical modification of a poly(methylvinyl)silazane (HTT 1800) with graphene oxide (GO) via an amidation reaction catalyzed by ZnCl2. With the formation of an SSP, the restacking of GO was effectively prevented by the HTT 1800 grafted at the surface of GO. After pyrolysis of warm-pressed green bodies comprised of the SSP, GO-HTT 1800, monolithic silicon carbonitride (SiCN) ceramic nanocomposites containing in-situ thermally reduced graphene oxide (RGO), namely RGO-SiCN, were successfully prepared. The resultant RGO-SiCN nanocomposites possess versatile electromagnetic (EM) properties ranging from EM absorbing to shielding behavior. With 2.5 wt.% GO in the feed, the final RGO-SiCN nanocomposite exhibits an outstanding minimal reflection coefficient (RCmin) of -62.1 dB at 9.0 GHz, and the effective absorption bandwidth reaches 3.0 GHz with a sample thickness of 2.10 mm. With the same GO content, the resultant RGO-SiCN nanocomposite prepared by mechanical blending exhibits a far inferior RCmin of -8.2 dB. This finding strongly supports the advantage of the developed SSP route suitable for the fabrication of RGO-SiCN nanocomposites with significantly enhanced EM properties. With 12.0 wt.% GO content in the feed, the obtained RGO-SiCN nanocomposite reveals an excellent shielding effectiveness of 41.2 dB with a sample thickness of 2.00 mm.

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Publication details

The article was received on 23 Jan 2017, accepted on 11 Jul 2017 and first published on 11 Jul 2017


Article type: Paper
DOI: 10.1039/C7TC00395A
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Single-source-precursor synthesis and electromagnetic properties of novel RGO-SiCN ceramic nanocomposites

    X. Liu, Z. Yu, R. Ishikawa, L. Chen, X. Yin, Y. Ikuhara and R. Riedel, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC00395A

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