Liu, Xingmin ; Yu, Zhaoju ; Ishikawa, Ryo ; Chen, Lingqi ; Yin, Xiaowei ; Ikuhara, Yuichi ; Riedel, Ralf (2017)
Single-source-precursor synthesis and electromagnetic properties of novel RGO–SiCN ceramic nanocomposites.
In: Journal of Materials Chemistry C, 5 (31)
doi: 10.1039/c7tc00395a
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2017 |
| Autor(en): | Liu, Xingmin ; Yu, Zhaoju ; Ishikawa, Ryo ; Chen, Lingqi ; Yin, Xiaowei ; Ikuhara, Yuichi ; Riedel, Ralf |
| Art des Eintrags: | Bibliographie |
| Titel: | Single-source-precursor synthesis and electromagnetic properties of novel RGO–SiCN ceramic nanocomposites |
| Sprache: | Englisch |
| Publikationsjahr: | 11 Juli 2017 |
| Verlag: | Royal Society of Chemistry |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Materials Chemistry C |
| Jahrgang/Volume einer Zeitschrift: | 5 |
| (Heft-)Nummer: | 31 |
| DOI: | 10.1039/c7tc00395a |
| URL / URN: | https://doi.org/10.1039/c7tc00395a |
| Kurzbeschreibung (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. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 17 Jan 2018 11:36 |
| Letzte Änderung: | 17 Jan 2018 11:36 |
| PPN: | |
| Sponsoren: | 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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