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

Liu, Xingmin and Yu, Zhaoju and Ishikawa, Ryo and Chen, Lingqi and Yin, Xiaowei and Ikuhara, Yuichi and Riedel, Ralf (2017):
Single-source-precursor synthesis and electromagnetic properties of novel RGO–SiCN ceramic nanocomposites.
In: Journal of Materials Chemistry C, Royal Society of Chemistry, pp. 7950-7960, 5, (31), ISSN 2050-7526, DOI: 10.1039/c7tc00395a, [Online-Edition: https://doi.org/10.1039/c7tc00395a],
[Article]

Abstract

Single-source-precursors (SSPs) have been synthesized through chemical modification of 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 comprising 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.

Item Type: Article
Erschienen: 2017
Creators: Liu, Xingmin and Yu, Zhaoju and Ishikawa, Ryo and Chen, Lingqi and Yin, Xiaowei and Ikuhara, Yuichi and Riedel, Ralf
Title: Single-source-precursor synthesis and electromagnetic properties of novel RGO–SiCN ceramic nanocomposites
Language: English
Abstract:

Single-source-precursors (SSPs) have been synthesized through chemical modification of 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 comprising 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.

Journal or Publication Title: Journal of Materials Chemistry C
Volume: 5
Number: 31
Publisher: Royal Society of Chemistry
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 17 Jan 2018 11:36
DOI: 10.1039/c7tc00395a
Official URL: https://doi.org/10.1039/c7tc00395a
Funders: Z. Y. thanks the Alexander von Humboldt Foundation, the Natural Science Foundation of China (No. 50802079), the Natural Science Foundation of Fujian Province of China (No. 2015J01221) ., and Creative Research Foundation of Science and Technology on Thermostructural Composite Materials Laboratory (No. 6142911040114) for financial support., X.L. acknowledges the financial support from China Scholarship Council (No. 201406290019)., R. I. and Y. I. acknowledge support from the Joint Research Project between Japan and Germany through JSPS Bilateral Program and the Exploratory Research program of MEXT, Core-to-Core Program of JSPS.
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