Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.525270
Title: Electronic band structure of carbon nanomaterials
Author: Chuang, Kai-Chieh
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2009
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Abstract:
This thesis reports the study of electronic structures for single-walled carbon nanotubes, single layer graphene and thin graphite. A brief introduction is given in Chapter 1 for the geometric and electronic structures of the materials studied while a review for the theory and experimental results relevant to this thesis is given in Chapter 2. The effects of hydrostatic pressure on surfactant-wrapped-single walled carbon nanotubes are studied in Chapter 3 by using photoluminscence and photoluminscence excitation mapping. It is found that the changes to the optical properties can be explained by the compression in carbon-carbon bonds, an effective uniaxial strain exerted on the nanotubes and changes in the surrounding environment leading to changes in the many-body interactions experienced by the nanotubes. Chapter 4 reports the study of cross-polarized photoluminescence of nanotubes isolated by conjugated polymers dispersed in solvents. The effects of Coulomb interactions on the optical bandgaps of the nanotubes are discussed here. Chapter 5 reports Cyclotron resonances studies of graphene monolayers. It is found that a significant asymmetry exists between the electron and hole band structures near the Dirac point, and the asymmetry is bigger than that is expected in a simple tight-binding model. Chapter 6 reports a magnetoabsorption study of the electronic structures near the K- and H- points. It is found that the transitions are not describe well by the conventional Slonczewski-Weiss-McClure model, but can be described instead with a simplified asymmetric effective bilayer model.
Supervisor: Nicholas, Robin J. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.525270  DOI: Not available
Keywords: Physical Sciences ; Physics ; Condensed matter theory ; Nanotubes ; Graphene ; Photoluminescence ; Cyclotron Resonance
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