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Nitrogen-doped-CNTs/Si3N4 nanocomposites with high electrical conductivity |
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| Affiliation: | 1. Institute of Ceramics and Glass (ICV-CSIC) Campus Cantoblanco, c/ Kelsen 5, 28049 Madrid, Spain;2. Research Center for Exotic Nanocarbons (JST), Shinshu University, Wakasato 4-17-1, Nagano 380-853, Japan;3. Institute of Carbon Science and Technology, Shinshu University, Wakasato 4-17-1, Nagano 380-853, Japan;4. Department of Physics, Department of Chemistry, Department of Materials Science and Engineering & Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA 16802, USA;1. Department of Physics, Konkuk University, Seoul 143-701, Republic of Korea;2. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 130-743, Republic of Korea;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China |
| Abstract: | Novel highly electrically conducting nanocomposites consisting of a silicon nitride (Si3N4) 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/Si3N4 nanocomposites. The nitrogen doping also favored a strong mechanical interlocking between the nanotubes and the Si3N4 matrix; when compared to the undoped carbon nanotubes. These novel nanocomposites could be used in devices associated to power generation or telecommunications. |
| Keywords: | Carbon nanotubes Silicon nitride Ceramics Nanocomposites Electrical conductivity |
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