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Thermal decomposition of carbon-rich polymer-derived silicon carbonitrides leading to ceramics with high specific surface area and tunable micro- and mesoporosity

Prasad, Ravi Mohan and Mera, Gabriela and Morita, Koji and Müller, Mathis and Kleebe, Hans-Joachim and Gurlo, Aleksander and Fasel, Claudia and Riedel, Ralf (2012):
Thermal decomposition of carbon-rich polymer-derived silicon carbonitrides leading to ceramics with high specific surface area and tunable micro- and mesoporosity.
In: Journal of the European Ceramic Society, pp. 477-484, 32, (2), ISSN 09552219,
[Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2011.08.020],
[Article]

Abstract

Herein we report on the thermal decomposition of SiCN polymer-derived ceramics leading to materials with high specific surface area and defined pore sizes. The ceramics were obtained by means of pyrolysis of a carbon-rich poly(diphenylsilylcarbodiimide) precursor and by varying the thermolysis parameters, namely temperature, annealing time and using additional annealing steps. The thermal decomposition of SiCN ceramics is correlated with the carbothermal reaction of amorphous silicon nitride phase with excess carbon and this detrimental event leads to high specific surface area up to 568 m2 g−1 and micro- and mesopores formation in these materials. High-resolution TEM investigations have confirmed that the pores are embedded only in the carbon phase. Moreover, the relationship between the pore sizes and the organization of free carbon phase is discussed.

Item Type: Article
Erschienen: 2012
Creators: Prasad, Ravi Mohan and Mera, Gabriela and Morita, Koji and Müller, Mathis and Kleebe, Hans-Joachim and Gurlo, Aleksander and Fasel, Claudia and Riedel, Ralf
Title: Thermal decomposition of carbon-rich polymer-derived silicon carbonitrides leading to ceramics with high specific surface area and tunable micro- and mesoporosity
Language: English
Abstract:

Herein we report on the thermal decomposition of SiCN polymer-derived ceramics leading to materials with high specific surface area and defined pore sizes. The ceramics were obtained by means of pyrolysis of a carbon-rich poly(diphenylsilylcarbodiimide) precursor and by varying the thermolysis parameters, namely temperature, annealing time and using additional annealing steps. The thermal decomposition of SiCN ceramics is correlated with the carbothermal reaction of amorphous silicon nitride phase with excess carbon and this detrimental event leads to high specific surface area up to 568 m2 g−1 and micro- and mesopores formation in these materials. High-resolution TEM investigations have confirmed that the pores are embedded only in the carbon phase. Moreover, the relationship between the pore sizes and the organization of free carbon phase is discussed.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 32
Number: 2
Uncontrolled Keywords: Precursor-organic, Electron microscopy, Microstructure-final, Porosity, Carbon-rich polymer-derived SiCN ceramic
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 Apr 2012 09:26
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2011.08.020
Identification Number: doi:10.1016/j.jeurceramsoc.2011.08.020
Funders: DFG, priority program SPP 1299, LOEWE-Zentrum AdRIA (Adaptronik—Research, Innovation, Application), funded by the state of Hesse, Germany
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