Electronic Transport on Aligned Carbon Nanotube Assemblies

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dc.contributor.advisorKono, Junichiroen_US
dc.creatorYu, Shengjieen_US
dc.date.accessioned2025-05-16T14:39:56Zen_US
dc.date.available2025-05-16T14:39:56Zen_US
dc.date.created2025-05en_US
dc.date.issued2025-02-14en_US
dc.date.submittedMay 2025en_US
dc.date.updated2025-05-16T14:39:56Zen_US
dc.description.abstractIndividual carbon nanotubes (CNTs) offer high electrical conductivity, tensile strength, and flexibility, but these properties are diminished in randomly oriented structures. Aligned CNT fibers retain good conductivity (up to 10.9 MS/m) but are still inferior to individual CNTs. We have investigated electronic transport phenomena in these fibers through temperature- and magnetic field-dependent measurements, finding that the conductivity decreases with decreasing temperature at low temperatures due to quantum conductance corrections. Using a combination of 3D and 1D weak localization (WL) models, we explained the observed magnetoresistance and discuss their dimensionality in detail. Low-temperature studies on individual CNT bundles showed significant quantum corrections, with WL and universal conductance fluctuations (UCF) providing consistent phase coherence length estimates (tens of nanometers). However, UCF amplitude and magnetic field asymmetry suggest a coherence length scale similar to the few-micron distance between the voltage probes. This study enhances the understanding of electronic transport mechanisms in aligned CNT fibers, essential for improving conductivity for various applications.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.urihttps://hdl.handle.net/1911/118352en_US
dc.language.isoenen_US
dc.subjectCarbon Nanotube Fibers Electronic Transporten_US
dc.titleElectronic Transport on Aligned Carbon Nanotube Assembliesen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentApplied Physicsen_US
thesis.degree.disciplineApplied Physics/Electrical Eng, Applied Physics/Electrical Engen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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