A computational study of electronic structures of graphene allotropes with electrical bias, 2011

Collection:
Atlanta University and Clark Atlanta University Theses and Dissertations
Title:
A computational study of electronic structures of graphene allotropes with electrical bias, 2011
Creator:
Nathaniel, James Edward, II
Contributor to Resource:
Wang, Xiao-Qian
Date of Original:
2011-12-01
Subject:
Degrees, Academic
Dissertations, Academic
Location:
United States, Georgia, Fulton County, Atlanta, 33.749, -84.38798
Medium:
dissertations
theses
Type:
Text
Format:
application/pdf
Description:
Degree Type: thesis
Degree Name: Master of Science (MS)
Date of Degree: 2011
Granting Institution: Clark Atlanta University
Department/ School: School of Arts and Sciences, Physics
Graphene is a two-dimensional system consisting of a single planar layer of carbon atoms with hexagonal arrangement. Various approaches have been proposed to control its physical and electronic properties. When appropriately cut, rolled, and bonded, graphene generates single-walled carbon nanotubes of varying diameters. Graphite intercalation compounds are materials formed by inserting molecular layers of compounds between stacked sheets of graphene. We have studied the physical and electronic responses of two graphene layers intercalated with FeCl3 and of metallic, semi-metallic and semiconducting nanotubes when normally biased using electric fields of various magnitudes. By means of first-principles density functional calculations, our results indicate that the band structures of the aforementioned graphene structures are modified upon application of a bias voltage. In the case of nanotubes, electric biasing allows tuning of the band gap leading to a transition from semiconducting to metallic state, or vice versa. In the case of the FeCl3 intercalant compounds, electric biasing results in shifting of the Dirac point.
Metadata URL:
http://hdl.handle.net/20.500.12322/cau.td:2011_nathaniel_james_e_ii
Language:
eng
Holding Institution:
Clark Atlanta University
Rights:
Rights Statement information

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