Sarkar, Soumya and Das, Probal Kumar (2014) Role of interface on electrical conductivity of carbon nanotube/alumina nanocomposite. Ceramics International, 40 (2). pp. 2723-2729. ISSN 0272-8842

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Interface of multiwalled carbon nanotube (MWCNT)/alumina (Al2O3) nanocomposites have been studied using TEM. At low sintering temperature (T-sin = 1500 degrees C), a 3-5 nm thick amorphous interface region was noticed. Nanocomposite sintered at 1700 degrees C possessed a well-defined graphene layer coating on matrix grains as the interface between CNT and Al2O3. A mechanism of such layered interface formation has been proposed. No traceable chemical reaction product was observed at the interface even after sintering at 1700 degrees C. It was noticed that while DC electrical conductivity (sigma(DC)) of 1500 degrees C sintered 2.4 vol% MWCNT/Al2O3 nanocomposite was only similar to 0.02 S/m, it raised to similar to 21 S/m when sintering was done at 1700 degrees C. Such 10(3) times increase in sigma(DC) of present nanocomposite at a constant CNT loading was not only resulted from the exceptionally high electron mobility of CNT but the well-crystallized graphene interface on insulating type Al2O3 grains also significantly contributed in the overall increase of electrical performance of the nanocomposite, especially, when sintering was done at 1700 degrees C. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Item Type: Article
Subjects: Engineering Materials
Divisions: Non-Oxide Ceramics & Composites
Depositing User: Bidhan Chaudhuri
Date Deposited: 12 Dec 2014 10:32
Last Modified: 12 Dec 2014 10:32

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