Title Polypropylene-based melt mixed composites with singlewalled carbon nanotubes for thermoelectric applications: switching from p-type to n-type by the addition of polyethylene glycol
Date 13.01.2017
Number 52350
Abstract The thermoelectric properties of melt processed conductive nanocomposites consisting of an insulating polypropylene (PP) matrix filled with singlewalled carbon nanotubes (CNTs) and copper oxide (CuO) were evaluated. An easy and cheap route to switch p-type composites into n-type was developed by adding polyethylene glycol (PEG) during melt mixing. At the investigated CNT concentrations of 0.8 wt% and 2 wt% (each above the electrical percolation threshold of ~0.1 wt%), and a fixed CuO content of 5 wt%, the PEG addition converted p-type composites (positive Seebeck coefficient (S)) into n-type (negative S). PEG was also found to improve the filler dispersion inside the matrix. Two composites were prepared: P-type polymer/CNT composites with high S (up to 45 µV/K), and n-type composites (with S up to -56 µV/K) through the addition of PEG. Two prototypes with 4 and 49 thermocouples of these p- and n-type composites were fabricated, and delivered an output voltage of 21 mV and 110 mV, respectively, at a temperature gradient of 70 K.
Publisher Polymer
Citation Polymer 108 (2017) 513-520
Authors Luo, J. ; Cerretti, G. ; Krause, B. ; Zhang, L. ; Otto, T. ; Jenschke, W. ; Ullrich, M. ; Tremel, W. ; Voit, B. ; Pötschke, P.
Tags thermoelectric composite polymer carbon nanotube copper oxide n-type

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