Authors Gnanaseelan, M. ; Samanta, S. ; Pionteck, J. ; Jehnichen, D. ; Simon, F. ; Pötschke, P. ; Voit, B.
Title Vanadium salt assisted solvothermal reduction of graphene oxide and the thermoelectric characterisation of the reduced graphene oxide in bulk and as composite
Date 01.05.2019
Number 56254
Abstract The solvothermal reduction of graphene oxide (GO), modified by the addition of vanadium chloride, resulted in an increased reduction degree of the reduced graphene oxide (rGO), which is reflected by a remarkably increased electrically conductivity of up to 8.5·S/cm, a value 30 times higher than that of rGO prepared without vanadium salt addition. Parallel with this increase, the thermoelectrical properties of rGO are improved, with a reached maximum Seebeck coefficient of 13.7·µV/K. The rGOs were used as fillers in flexible styrene-butadiene-styrene triblock copolymer composites prepared by solution mixing. Compared to the traditionally prepared reduced graphene oxide, the new product provides up to 60 times higher conductivity to the composite, while the Seebeck coefficient is nearly the same. The highest power factor of 4.6·×·10-4 µW/(m·K2) was achieved at 100·°C with 30·wt% loading, which is 30 times higher than that of the traditional reduced graphene oxide containing composite.
Publisher Materials Chemistry and Physics
Citation Materials Chemistry and Physics 229 (2019) 319-329

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