Single-walled carbon nanotubes (SWNTs) have attracted strong attention as thermoelectric (TE) material due to their extremely high electrical conductivity (σ),light weight, mechanical toughness and flexibility. However, SWNTs are produced as a mixture of metallic (m-) and semiconducting SWNTs (s-SWNTs). S-SWNT sheet is proved to have large Seebeck coefficient (S) theoretically and experimentally [1,2], however, its improvement in ZT value is still uncertain compared with the unsorted SWNT sheet. In this study, we systematically characterized the TE properties of s-SWNT sheets with different ratio of m-SWNTs as well as the unsorted SWNT sheet to evaluate the necessity of s-SWNT extraction from its SWNT mixture.
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