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 of anionic surfactants were employed to fabricate SWCNT films via drop-casting, fol...

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Autores principales:	Susumu Yonezawa, Tomoyuki Chiba, Yuhei Seki, Masayuki Takashiri
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d4a2ca37f6484c80a6eb6d551272f325
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spelling	oai:doaj.org-article:d4a2ca37f6484c80a6eb6d551272f3252021-12-02T11:35:57ZOrigin of n type properties in single wall carbon nanotube films with anionic surfactants investigated by experimental and theoretical analyses10.1038/s41598-021-85248-92045-2322https://doaj.org/article/d4a2ca37f6484c80a6eb6d551272f3252021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-85248-9https://doaj.org/toc/2045-2322Abstract 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 of anionic surfactants were employed to fabricate SWCNT films via drop-casting, followed by heat treatment at various temperatures. In particular, SWCNT films with sodium dodecylbenzene sulfonate (SDBS) surfactant heated to 350 °C exhibited a longer retention period, wherein the n-type Seebeck coefficient lasted for a maximum of 35 days. In x-ray photoelectron spectroscopy, SWCNT films with SDBS surfactant exhibited a larger amount of sodium than oxygen on the SWCNT surface. The electronic band structure and density of states of SWCNTs with oxygen atoms, oxygen molecules, water molecules, sulfur atoms, and sodium atoms were analyzed using first-principles calculations. The calculations showed that sodium atoms and oxygen molecules moved the Fermi level closer to the conduction and valence bands, respectively. The water molecules, oxygen, and sulfur atoms did not affect the Fermi level. Therefore, SWCNT films exhibited n-type thermoelectric properties when the interaction between the sodium atoms and the SWCNTs was larger than that between the oxygen molecules and the SWCNTs.Susumu YonezawaTomoyuki ChibaYuhei SekiMasayuki TakashiriNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Susumu Yonezawa Tomoyuki Chiba Yuhei Seki Masayuki Takashiri Origin of n type properties in single wall carbon nanotube films with anionic surfactants investigated by experimental and theoretical analyses
description	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 of anionic surfactants were employed to fabricate SWCNT films via drop-casting, followed by heat treatment at various temperatures. In particular, SWCNT films with sodium dodecylbenzene sulfonate (SDBS) surfactant heated to 350 °C exhibited a longer retention period, wherein the n-type Seebeck coefficient lasted for a maximum of 35 days. In x-ray photoelectron spectroscopy, SWCNT films with SDBS surfactant exhibited a larger amount of sodium than oxygen on the SWCNT surface. The electronic band structure and density of states of SWCNTs with oxygen atoms, oxygen molecules, water molecules, sulfur atoms, and sodium atoms were analyzed using first-principles calculations. The calculations showed that sodium atoms and oxygen molecules moved the Fermi level closer to the conduction and valence bands, respectively. The water molecules, oxygen, and sulfur atoms did not affect the Fermi level. Therefore, SWCNT films exhibited n-type thermoelectric properties when the interaction between the sodium atoms and the SWCNTs was larger than that between the oxygen molecules and the SWCNTs.
format	article
author	Susumu Yonezawa Tomoyuki Chiba Yuhei Seki Masayuki Takashiri
author_facet	Susumu Yonezawa Tomoyuki Chiba Yuhei Seki Masayuki Takashiri
author_sort	Susumu Yonezawa
title	Origin of n type properties in single wall carbon nanotube films with anionic surfactants investigated by experimental and theoretical analyses
title_short	Origin of n type properties in single wall carbon nanotube films with anionic surfactants investigated by experimental and theoretical analyses
title_full	Origin of n type properties in single wall carbon nanotube films with anionic surfactants investigated by experimental and theoretical analyses
title_fullStr	Origin of n type properties in single wall carbon nanotube films with anionic surfactants investigated by experimental and theoretical analyses
title_full_unstemmed	Origin of n type properties in single wall carbon nanotube films with anionic surfactants investigated by experimental and theoretical analyses
title_sort	origin of n type properties in single wall carbon nanotube films with anionic surfactants investigated by experimental and theoretical analyses
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d4a2ca37f6484c80a6eb6d551272f325
work_keys_str_mv	AT susumuyonezawa originofntypepropertiesinsinglewallcarbonnanotubefilmswithanionicsurfactantsinvestigatedbyexperimentalandtheoreticalanalyses AT tomoyukichiba originofntypepropertiesinsinglewallcarbonnanotubefilmswithanionicsurfactantsinvestigatedbyexperimentalandtheoreticalanalyses AT yuheiseki originofntypepropertiesinsinglewallcarbonnanotubefilmswithanionicsurfactantsinvestigatedbyexperimentalandtheoreticalanalyses AT masayukitakashiri originofntypepropertiesinsinglewallcarbonnanotubefilmswithanionicsurfactantsinvestigatedbyexperimentalandtheoreticalanalyses
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Origin of n type properties in single wall carbon nanotube films with anionic surfactants investigated by experimental and theoretical analyses

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