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In situ formation of tungsten oxycarbide, tungsten carbide and tungsten nitride nanoparticles in micro- and mesoporous polymer-derived ceramics

Bazarjani, Mahdi Seifollahi and Müller, Mathis M. and Kleebe, Hans-Joachim and Fasel, Claudia and Riedel, Ralf and Gurlo, Aleksander (2014):
In situ formation of tungsten oxycarbide, tungsten carbide and tungsten nitride nanoparticles in micro- and mesoporous polymer-derived ceramics.
In: Journal of Materials Chemistry A, Royal Society of Chemistry Publishing, pp. 10454-10464, 2, (27), ISSN 2050-7488,
[Online-Edition: http://dx.doi.org/10.1039/C4TA01509F],
[Article]

Abstract

We present a facile approach to design micro- and mesoporous ceramic nanocomposites, which avoids the sintering of nanoparticles even at high synthesis temperatures and in situ forms nanoparticles in high temperature stable porous silicon oxycarbonitride (SiOC(N)) matrices. Our case study includes the synthesis of micro- and mesoporous polymer nanocomposites (c-WO3−x/WO3×H2O/[–Si(O)CH2–]n) which contain cubic tungsten oxide and tungsten oxide monohydrate (c-WO3−x/WO3×H2O) nanowhiskers in highly micro- and mesoporous polycarbosilane–siloxane matrices. The thermolysis of c-WO3−x/WO3×H2O/[–Si(O)CH2–]n nanocomposites under a suitable atmosphere and temperature leads to the in situ formation of well-dispersed nanoparticles of cubic tungsten oxide (c-WO3−x), tungsten oxycarbide (W2CO), tungsten carbide (WC) and tungsten nitride (WN) in micro- and mesoporous matrices.

Item Type: Article
Erschienen: 2014
Creators: Bazarjani, Mahdi Seifollahi and Müller, Mathis M. and Kleebe, Hans-Joachim and Fasel, Claudia and Riedel, Ralf and Gurlo, Aleksander
Title: In situ formation of tungsten oxycarbide, tungsten carbide and tungsten nitride nanoparticles in micro- and mesoporous polymer-derived ceramics
Language: English
Abstract:

We present a facile approach to design micro- and mesoporous ceramic nanocomposites, which avoids the sintering of nanoparticles even at high synthesis temperatures and in situ forms nanoparticles in high temperature stable porous silicon oxycarbonitride (SiOC(N)) matrices. Our case study includes the synthesis of micro- and mesoporous polymer nanocomposites (c-WO3−x/WO3×H2O/[–Si(O)CH2–]n) which contain cubic tungsten oxide and tungsten oxide monohydrate (c-WO3−x/WO3×H2O) nanowhiskers in highly micro- and mesoporous polycarbosilane–siloxane matrices. The thermolysis of c-WO3−x/WO3×H2O/[–Si(O)CH2–]n nanocomposites under a suitable atmosphere and temperature leads to the in situ formation of well-dispersed nanoparticles of cubic tungsten oxide (c-WO3−x), tungsten oxycarbide (W2CO), tungsten carbide (WC) and tungsten nitride (WN) in micro- and mesoporous matrices.

Journal or Publication Title: Journal of Materials Chemistry A
Volume: 2
Number: 27
Publisher: Royal Society of Chemistry Publishing
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 02 Jul 2014 11:53
Official URL: http://dx.doi.org/10.1039/C4TA01509F
Identification Number: doi:10.1039/C4TA01509F
Funders: R. R. thanks the Fonds der Chemischen Industrie, Frankfurt, Germany, for continuous financial support. , The financial support by the priority program “ Adapting surfaces for high temperature applications ” (SPP 1299) of the German Research Foundation (DFG) is greatly acknowledged.
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