Abstract
Abstract Novel highly electrically conducting nanocomposites consisting of a silicon nitride (Si 3 N 4 ) ceramic matrix containing up to 13.6 vol.% of nitrogen-doped multi-walled carbon nanotubes (CNx) were fabricated. As-synthesized CNx were treated with hydrogen peroxide in order to efficiently detach/isolate the nanotubes from bundles, then they were mixed with the ceramic powders and fully densified using the spark plasma sintering (SPS) technique. Composites containing 13.6 vol.% CNx reached an electrical conductivity of 2174 S m −1 that is the highest value reported hitherto for carbon nanotubes/Si 3 N 4 nanocomposites. The nitrogen doping also favored a strong mechanical interlocking between the nanotubes and the Si 3 N 4 matrix; when compared to the undoped carbon nanotubes. These novel nanocomposites could be used in devices associated to power generation or telecommunications.
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