Abstract
Electrical conductivity and Seebeck coefficient of freestanding paper of graphene oxide (GO) and GO reduced by heat treatment at 180 °C (rGO) are tuned by addition of carbon nanotubes (CNT). The electrical conductivity of rGO with 50% of CNT is raised to ∼2940 S/m from ∼613 S/m for pure rGO or ∼34 S/m for GO with 50% of CNT without reduction. Moreover, Seebeck coefficient of rGO increases with addition of CNT from −7.04 μV/K for pure rGO to −20.82 μV/K for rGO with 50% of CNT, presenting n-type conductivity. As result, calculated power factor PF is enhanced with increasing CNT concentration and the highest PF ∼1.28 μW/(K2m) is obtained for rGO with 50% of CNT.
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