Origin of n type properties in single wall carbon nanotube films with anionic surfactants investigated by experimental and theoretical analyses

Abstract We investigated the origin of n-type thermoelectric properties in single-wall carbon nanotube (SWCNT) films with anionic surfactants via experimental analyses and first-principles calculations. Several types were employed to fabricate SWCNT drop-casting, followed by heat treatment at various temperatures. In particular, sodium dodecylbenzene sulfonate (SDBS) surfactant heated 350 °C exhibited a longer retention period, wherein Seebeck coefficient lasted for maximum 35 days. x-ray photoelectron spectroscopy, SDBS larger amount than oxygen on surface. The electronic band structure density states SWCNTs atoms, molecules, water sulfur atoms analyzed using calculations showed that molecules moved Fermi level closer conduction valence bands, respectively. oxygen, did not affect level. Therefore, when interaction between was SWCNTs.