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Dispersion assessment and studies on AC percolative conductivity in polymer-derived Si–C–N/CNT ceramic nanocomposites

Ionescu, E. and Francis, A. and Riedel, R. (2009):
Dispersion assessment and studies on AC percolative conductivity in polymer-derived Si–C–N/CNT ceramic nanocomposites.
In: Journal of Materials Science, 44 (8), Springer, pp. 2055-2062, ISSN 0022-2461,
[Online-Edition: http://dx.doi.org/10.1007/s10853-009-3304-3],
[Article]

Abstract

Nanocomposites comprise polysilazane-derived SiCN ceramic charged with carbon nanotubes (CNTs) have been prepared by dispersion of multi-walled CNTs with a diameter of 80 nm in a cross-linked polysilazane (HTT 1800, Clariant) using a simple roll-mixer method. Subsequently, the composites were warm pressed and pyrolyzed in argon atmosphere. Scanning electron microscopy (SEM) and 3D Raman imaging techniques were used as major tools to assess the dispersion of CNTs throughout the ceramic matrix. Furthermore, studies on the effect of the volume fraction of CNTs in the nanocomposites on their electrical properties have been performed. The specific bulk conductivities of the materials were analyzed by AC impedance spectroscopy, revealing percolation thresholds (ρc) at CNT loadings lower than 1 vol%. Maximum conductivity amounted to 7.6 × 10−2 S/cm was observed at 5 vol% CNT. The conductivity exponent in the SiCN/CNT composites was found equal to 1.71, indicating transport in three dimensions.

Item Type: Article
Erschienen: 2009
Creators: Ionescu, E. and Francis, A. and Riedel, R.
Title: Dispersion assessment and studies on AC percolative conductivity in polymer-derived Si–C–N/CNT ceramic nanocomposites
Language: English
Abstract:

Nanocomposites comprise polysilazane-derived SiCN ceramic charged with carbon nanotubes (CNTs) have been prepared by dispersion of multi-walled CNTs with a diameter of 80 nm in a cross-linked polysilazane (HTT 1800, Clariant) using a simple roll-mixer method. Subsequently, the composites were warm pressed and pyrolyzed in argon atmosphere. Scanning electron microscopy (SEM) and 3D Raman imaging techniques were used as major tools to assess the dispersion of CNTs throughout the ceramic matrix. Furthermore, studies on the effect of the volume fraction of CNTs in the nanocomposites on their electrical properties have been performed. The specific bulk conductivities of the materials were analyzed by AC impedance spectroscopy, revealing percolation thresholds (ρc) at CNT loadings lower than 1 vol%. Maximum conductivity amounted to 7.6 × 10−2 S/cm was observed at 5 vol% CNT. The conductivity exponent in the SiCN/CNT composites was found equal to 1.71, indicating transport in three dimensions.

Journal or Publication Title: Journal of Materials Science
Volume: 44
Number: 8
Publisher: Springer
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: 12 Apr 2012 08:36
Official URL: http://dx.doi.org/10.1007/s10853-009-3304-3
Identification Number: doi:10.1007/s10853-009-3304-3
Funders: Alexander von Humboldt fellowship program, Fonds der Chemischen Industrie for financial support
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