Electrical properties of carbon structures : carbon nanotubes and graphene nanoribbons

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dc.contributor.advisor Khatun, Mahfuza
dc.contributor.author Kan, Zhe
dc.date.accessioned 2013-12-18T21:00:10Z
dc.date.available 2013-12-18T21:00:10Z
dc.date.created 2013-12-14
dc.date.issued 2013-12-14
dc.identifier.uri http://cardinalscholar.bsu.edu/handle/123456789/197806
dc.description.abstract Graphene is a one-atom thick sheet of graphite which made of carbon atoms arranged in a hexagonal lattice. Carbon nanotubes and graphene nanoribbons can be viewed as single molecules in nanometer scale. Carbon nanotubes are usually labeled in terms of the chiral vectors which are also the directions that graphene sheets are rolled up. Due to their small scale and special structures, carbon nanotubes present interesting electrical, optical, mechanical, thermal, and toxic properties. Graphene nanoribbons can be viewed as strips cut from infinite graphene. Graphene nanoribbons can be either metallic or semiconducting depending on their edge structures. These are robust materials with excellent electrical conduction properties and have the potential for device applications. In this research project, we present a theoretical study of electrical properties of the carbon structures. Electronic band structures, density of states, and conductance are calculated. The theoretical models include a tight-binding model, a Green’s function methodology, and the Landauer formalism. We have investigated the effects of vacancy and weak disorder on the conductance of zigzag carbon nanoribbons. The resulting local density of states (LDOS) and conductance bands show that electron transport has interesting behavior in the presence of any disorder. In general, the presence of any disorder in the GNRs causes a decrease in conductance. In the presence of a vacancy at the edge site, a maximum decrease in conductance has been observed which is due to the presence of quasi-localized states.
dc.description.sponsorship Department of Physics and Astronomy
dc.description.tableofcontents Theory -- Band structure and density of states of carbon nanotubes -- Band structure and density of states of graphene nanoribbons -- Quantum conductance of zigzag graphene nanoribbons -- Quantum conductance of a zigzag graphene nanoribbon with defects.
dc.subject.lcsh Graphene.
dc.subject.lcsh Nanostructured materials -- Electric properties.
dc.subject.lcsh Carbon nanotubes -- Electric properties.
dc.title Electrical properties of carbon structures : carbon nanotubes and graphene nanoribbons en_US
dc.description.degree Thesis (M.S.)
dc.identifier.cardcat-url http://liblink.bsu.edu/catkey/1741647

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  • Master's Theses [5577]
    Master's theses submitted to the Graduate School by Ball State University master's degree candidates in partial fulfillment of degree requirements.

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