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Authors
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Krause, B. ; Konidakis, I. ; Arjmand, M. ; Sundararaj, U. ; Fuge, R. ; Liebscher, M. ; Hampel, S. ; Klaus, M. ; Serpetzoglou, E. ; Stratakis, E. ; Pötschke, P.
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Title
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Nitrogen-doped carbon nanotube/polypropylene composites with negative seebeck coefficient
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Date
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05.02.2020
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Number
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57962
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Abstract
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This study describes the application of multi-walled carbon nanotubes that were nitrogen-doped during their synthesis (N-MWCNTs) in melt-mixed polypropylene (PP) composites. Different types of N-MWCNTs, synthesized using different methods, were used and compared. Four of the five MWCNT grades showed negative Seebeck coefficients (S), indicating n-type charge carrier behavior. All prepared composites (with a concentration between 2 and 7.5 wt% N-MWCNTs) also showed negative S values, which in most cases had a higher negative value than the corresponding nanotubes. The S values achieved were between 1.0 µV/K and -13.8 µV/K for the N-MWCNT buckypapers or powders and between -4.7 µV/K and -22.8 µV/K for the corresponding composites. With a higher content of N-MWCNTs, the increase in electrical conductivity led to increasing values of the power factor (PF) despite the unstable behavior of the Seebeck coefficient. The highest power factor was achieved with 4 wt% N-MWCNT, where a suitable combination of high electrical conductivity and acceptable Seebeck coefficient led to a PF value of 6.1 × 10-3 µW/(m·K2). First experiments have shown that transient absorption spectroscopy (TAS) is a useful tool to study the carrier transfer process in CNTs in composites and to correlate it with the Seebeck coefficient.
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Publisher
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Journal of Composites Science
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Wikidata
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Citation
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Journal of Composites Science 4 (2020) 14
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DOI
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https://doi.org/10.3390/JCS4010014
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Tags
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polypropylene nitrogen doping carbon nanotube thermoelectric
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