In-plane Thermoelectric Properties of Nano-TiS₂/CNT/PEDOT–PSS Hybrid Films

We present the details of in-plane thermoelectric properties of nano-titanium disulfide (nano-TiS₂) / Carbon nanotube (CNT) / poly(3,4- ethylenedioxythiophene)–poly(styrenesulfonate) (PEDOT–PSS) hybrid films, in which PEDOT–PSS was used as a binder with high electrical conductivity. We attempted to reduce thermal conductivity, κ, of PEDOT–PSS/CNT hybrid film by enhancing the phonon scattering at the interface between CNT and nano-TiS₂ by the addition of nano-TiS₂. The Seebeck coefficient (S), electrical conductivity (σ), and power factor (PF) of a nano- TiS₂/CNT/PEDOT–PSS hybrid film at 50 °C for a weight ratio of 1:9:23 (CNT content 70 wt%) were S = 33.3 μV/K, σ= 406 S/cm, and PF = 45.0 µW/(mK²), respectively. The in-plane thermal conductivity (κ//) was 0.91 W/(mK) at room temperature for the hybrid film with a weight ratio of 1:9:23 (CNT content = 70 wt%). Moreover, the in-plane ZT of the hybrid film was 0.0163, which is about 4 times greater than that for PEDOT–PSS and CNT buckypaper (BP). (paper)