Fig. 1: Thermoelectric properties of densely packed and highly aligned carbon nanotube (CNT) fibers.
From: Macroscopic weavable fibers of carbon nanotubes with giant thermoelectric power factor
a SEM image of a CNT fiber. b Schematic of the experimental setup used for measuring the electrical conductivity (σ) and Seebeck coefficient (S) of CNT fibers. c Measured S and d corresponding power factor (PF = S2σ) as a function of σ for four CNT fibers that underwent different chemical treatments: Iodine monochloride (ICl) doped (solid blue triangles), as-produced (solid black circles), annealed at 350 °C (open red squares), and annealed at 500 °C (solid red squares). The values are summarized in Supplementary Table 2. Error bars indicate standard deviation (SD). e Comparison of reported PF values for various CNT samples with σ. The plot includes unsorted CNTs (as-grown (yellow square)44, p-doped (blue square)45 and n-doped (green square)26), semiconductor-enriched SWNCTs (originally produced by arc-discharge (AD) (orange diamond)46, by laser vaporization (LV) (green diamond)46, by HiPco (blue diamond)46, by plasma torch (PT) (pink diamond)46, and (6,5) SWCNTs (red diamond)22), metal-enriched SWCNTs (un-aligned films (blue circle)22 and aligned films (green circle)22), and CNT-filled polymer nanocomposites (PANI/graphene/PANI/DWCNT (purple triangle)47, PANI/graphene-PEDOT:PSS/PANI/DWCNT-PEDOT:PSS (pink triangle)48, and PANI/graphene/PANI/DWCNT (gray triangle)27). Values are summarized in Supplementary Table 4. PF values of Bi2Te3 alloys9, graphene10, and FeSe11 serve as references. f Comparison of reported PF values for representative materials with the thermal conductivity (κ) at 300 K with a temperature difference (ΔT) of 1 K. The plot includes metals (squares) (Co49), (YbAl350, CePd351, CuNi52, and AgPd52) and conventional thermoelectric cooling materials (triangles) (Bi2Te39, Cu0.9Ni0.1AgSe53, and Mg3Bi1.25Sb54). p-type (n-type) materials are highlighted in red (blue). †The temperature was at 400 K because values at 300 K were not available. *Thermal conductivity value was taken from ref. 16. Values are summarized in Supplementary Table 5.
