3D cellulose fiber networks modified by PEDOT:PSS/graphene nanoplatelets for thermoelectric applications

Organic materials have attracted considerable attention for thermoelectric (TE) applications. Given their potential as wearable power generators, there is an urgent need to develop organic TE that possess superior electronic properties well excellent mechanical and environmental stability. Here, we paper-based using the poly(3,4-ethylenedioxythiophene): polystyrenesulfonate (PEDOT:PSS), graphene nanoplatelets (GNPs), a starch-based biopolymer binder GNPs. The device fabrication consists of spraying biopolymer/GNP ink onto cellulose paper followed by PEDOT:PSS solution. Further enhancement was obtained adding ionic liquid (IL), bis(trifluoromethane)sulfonimide lithium salt Upon addition IL, electrical conductivity as-fabricated films increased nearly two orders magnitude. increases with GNPs' content due formation effective percolation network. Interestingly, incorporating GNPs simultaneously improves Seebeck coefficient. Raman measurements suggest concurrent coefficient might be related chemical bonding between conducting polymer chains filler. In addition, these composites display remarkable flexibility at various bending angles stability without losing original after three months exposure ambient conditions.