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High thermoelectric performance of post mechanical treated carbon nanotube films with polystyrene binder

The addition of external force to carbon nanotube (CNT)-based thermoelectric composites causes a large change in their microstructure, and thus, it is a promising approach to improve their thermoelectric performance. In this study, we report on CNT/polystyrene composites whose thermoelectric characteristics were enhanced by a post mechanical treatment method consisting of heating and pressing, which caused the condensation of the conducting network of CNTs. Polystyrene acts as a binder for maintaining the microstructure of the composites after the mechanical treatment. The post mechanical treated composite films with a small amount of polystyrene binder showed significantly higher electrical conductivity and thermoelectric power factor than the films made from pure CNTs. A high power factor of 789 μW/K2 m was observed in the post mechanical treated CNT-polystyrene composites with a CNT concentration of 75 wt. %.