resumo
By unzipping multi-walled carbon nanotubes (MWCNTs) it is possible to obtain graphene nanoribbons (GNRs) that could then be used as fillers in ceramic composites. Here we report the fabrication of silicon nitride (Si3N4) ceramics with different contents of GNRs by spark plasma sintering. The GNR fillers confer electrical conductivity to the Si3N4 composites, following a semiconducting-like behavior at relatively low volume filler concentrations (0.04). In addition, a toughening effect, produced by GNRs bridging the cracks was observed. GNRs appear to be an efficient alternative to graphene-based composites, useful in the fabrication of novel multifunctional ceramic composites. (C) 2015 Elsevier Ltd. All rights reserved.
palavras-chave
CARBON NANOTUBES; SI3N4 CERAMICS; MICROSTRUCTURE; PARTICLES; TOUGHNESS; GROWTH
categoria
Chemistry; Materials Science
autores
Ramirez, C; Osendi, MI; Miranzo, P; Belmonte, M; Figueiredo, F; Castro-Beltran, A; Terrones, M
nossos autores
Filipe Miguel H Lebre R Figueiredo
Investigador Principalagradecimentos
Present work financed by CSIC (Spain) under project PIE201360E063 and MINECO (Spain) with project MAT2012-32944. M. Terrones thanks support from the U.S. Air Force Office of Scientific Research MURI Grant FA9550-12-1-0035. F. Figueiredo thanks support by the Portuguese Foundation for Science and Technology (FCT) through projects CICECO-FCOMP-01-0124-FEDER-037271 (Ref. FCT PEst-C/CTM/LA0011/2013) and Investigador FCT 2013 contract number IF/01174/ 2013.