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Synthesis of polymer-derived graphene/silicon nitride-based nanocomposites with tunable dielectric properties

Wang, Xifan and Mera, Gabriela and Morita, Koji and Ionescu, Emanuel (2016):
Synthesis of polymer-derived graphene/silicon nitride-based nanocomposites with tunable dielectric properties.
In: Journal of the Ceramic Society of Japan, The Ceramic Society of Japan, pp. 981-988, 124, (10), ISSN 1882-0743,
[Online-Edition: http://dx.doi.org/10.2109/jcersj2.16089],
[Article]

Abstract

Within the present work, reduced-graphene oxide (rGO)/silicon nitride (Si3N4) nanocomposites were prepared upon pyrolysis of a graphene oxide (GO)-filled polysilazane. The novel preparative approach consists in the synthesis of the polysilazane in the presence of different concentrations of GO, yielding a homogeneous GO/polysilazane composite which was subsequently thermally converted in Ar atmosphere into rGO/Si3N4 nanocomposites. Hot-pressing of the obtained nanocomposite powders delivered monolithic rGO/Si3N4. All prepared samples exhibited the presence of homogeneously dispersed rGO phase within an amorphous or crystalline silicon nitride matrix, as for the as-prepared and hot-pressed samples, respectively. An increasing amount of rGO in the nanocomposites was found to gradually suppress the crystallization of the silicon nitride matrix into α-Si3N4. Moreover, depending on the volume fraction of the graphene phase in the ceramic nanocomposites, different dielectric properties were observed, indicating a facile preparative method to produce materials with tunable electromagnetic waves (EMW) behavior.

Item Type: Article
Erschienen: 2016
Creators: Wang, Xifan and Mera, Gabriela and Morita, Koji and Ionescu, Emanuel
Title: Synthesis of polymer-derived graphene/silicon nitride-based nanocomposites with tunable dielectric properties
Language: English
Abstract:

Within the present work, reduced-graphene oxide (rGO)/silicon nitride (Si3N4) nanocomposites were prepared upon pyrolysis of a graphene oxide (GO)-filled polysilazane. The novel preparative approach consists in the synthesis of the polysilazane in the presence of different concentrations of GO, yielding a homogeneous GO/polysilazane composite which was subsequently thermally converted in Ar atmosphere into rGO/Si3N4 nanocomposites. Hot-pressing of the obtained nanocomposite powders delivered monolithic rGO/Si3N4. All prepared samples exhibited the presence of homogeneously dispersed rGO phase within an amorphous or crystalline silicon nitride matrix, as for the as-prepared and hot-pressed samples, respectively. An increasing amount of rGO in the nanocomposites was found to gradually suppress the crystallization of the silicon nitride matrix into α-Si3N4. Moreover, depending on the volume fraction of the graphene phase in the ceramic nanocomposites, different dielectric properties were observed, indicating a facile preparative method to produce materials with tunable electromagnetic waves (EMW) behavior.

Journal or Publication Title: Journal of the Ceramic Society of Japan
Volume: 124
Number: 10
Publisher: The Ceramic Society of Japan
Uncontrolled Keywords: Silicon nitride, Reduced graphene oxide (rGO), rGO/Si3N4, Polymer-derived ceramic nanocomposites, Dielectric properties
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 04 Jan 2017 09:09
Official URL: http://dx.doi.org/10.2109/jcersj2.16089
Identification Number: doi:10.2109/jcersj2.16089
Funders: The authors acknowledge the financial support from European Commission through the Marie-Curie ITN project “ Functional Nitrides for Energy Applications, FUNEA ” (FP7-PITN-GA-2010- 264873), The authors acknowledge the financial support from the R&D Convergence Program of MSIP (Ministry of Science, ICT and Future Planning) and NST (National Research Council of Science & Technology) of Republic of Korea (Grant: CMIP-13-4-KIMS)., Also funding within the frame of a Joint Research Project between Japan (JSPS - Japan Society for the Promotion of Science) and Germany (DAAD - German Academic Exchange Service) is gratefully acknowledged.
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