Thermoelectric and Electronic Transport Studies of Ultrahigh-Conductivity Carbon Nanotube Fibers

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dc.contributor.advisorKono, Junichiroen_US
dc.creatorKomatsu, Natsumien_US
dc.date.accessioned2022-09-23T21:28:06Zen_US
dc.date.available2022-09-23T21:28:06Zen_US
dc.date.created2022-05en_US
dc.date.issued2022-04-20en_US
dc.date.submittedMay 2022en_US
dc.date.updated2022-09-23T21:28:06Zen_US
dc.description.abstractCarbon nanotubes (CNTs) are marvelous one-dimensional (1D) materials with extraordinary electronic, mechanical, thermal, magnetic, and optical properties. However, the 1D properties of individual CNTs are often lost in randomly ordered macroscopic assemblies. Recently, macroscopic fibers of aligned carbon nanotubes (CNTs) with ultrahigh conductivity (> 10 MS/m) have emerged. Understanding of transport processes in these ordered CNT assemblies is critical for further conductivity improvement, but systematic experimental investigations have not been performed to date. Here, we have studied thermoelectric and electrical properties of CNT fibers produced by the solution spinning method. We first measured thermoelectric quantities while tuning the Fermi energy and obtained a giant thermoelectric power factor. In probing the temperature and magnetic field dependence of the electrical conductivity of the fibers, we observed a metallic behavior in a wide temperature range (40-300 K) – i.e., the conductivity monotonically increased with decreasing temperature. At low temperatures (< 50 K), strongly temperature-dependent negative magnetoresistance appeared, which is a hallmark of the phenomenon of weak localization, suggesting that the electron transport at low temperatures is quantum coherent. In addition to macroscopic CNT fibers with diameters of ~10 μm, we also performed conductivity measurements on individual crystalline CNT bundles (with diameters ~ 20 nm and lengths ~ 10 μm) that constitute the fibers, to determine the dimensionality and coherence lengths of carriers.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationKomatsu, Natsumi. "Thermoelectric and Electronic Transport Studies of Ultrahigh-Conductivity Carbon Nanotube Fibers." (2022) Diss., Rice University. <a href="https://hdl.handle.net/1911/113332">https://hdl.handle.net/1911/113332</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/113332en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectCarbon nanotubesen_US
dc.subjectelectronic transporten_US
dc.subjectthermoelectric properties nanomaterialsen_US
dc.titleThermoelectric and Electronic Transport Studies of Ultrahigh-Conductivity Carbon Nanotube Fibersen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentElectrical and Computer Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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