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Authors
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Arjmand, M. ; Chizarim, K. ; Krause, B. ; Pötschke, P. ; Sundararaj, U.
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Title
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Effect of synthesis catalyst on structure of nitrogen-doped carbon nanotubes and electrical conductivity and electromagnetic interference shielding of their polymeric nanocomposites
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Date
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01.03.2016
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Number
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49204
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Abstract
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Different catalysts including Co, Fe, and Ni were used to synthesize nitrogen-doped carbon nanotubes (N-CNTs) by chemical vapor deposition technique. Synthesized N-CNTs were melt mixed with a polyvinylidene fluoride (PVDF) matrix using a small scale mixer at different concentrations ranging from 0.3 to 3.5 wt%, and then compression molded. The characterization techniques revealed significant differences in the synthesis yield and the morphological and electrical properties of both N-CNTs and nanocomposites depending on the catalyst type. Whereas Co and Fe resulted in yields comparable to industrial multiwalled CNTs, Ni was much less effective. The N-CNT aspect ratio was the highest for Co catalyst, followed by Ni and Fe, whereas nitrogen content was the highest for Ni. Raman spectroscopy revealed lowest defect number and highest N-CNT crystallinity for Fe catalyst. Characterization of N-CNT/PVDF nanocomposites showed better dispersion for N-CNTs based on Co and Fe as compared to Ni, and the following order of electrical conductivity and electromagnetic interference shielding (from high to low): Co > Fe > Ni. The superior electrical properties of (N-CNT)Co nanocomposites were ascribed to a combination of high synthesis yield, high aspect ratio, low nitrogen content and high crystallinity of N-CNTs combined with a good state of N-CNT dispersion.
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Publisher
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Carbon
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Wikidata
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Q60157873
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Citation
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Carbon 98 (2016) 358-372
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DOI
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https://doi.org/10.1016/J.CARBON.2015.11.024
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Tags
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chemical-vapor-deposition ray photoelectron-spectroscopy band dielectric-properties fiber-composite foams c-n nanotubes nanotube/polystyrene composites thermogravimetric analysis raman-spectroscopy field-emission electronic-properties
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