Structural and electronic stability of Russian-doll -style Sc4C2C80, 2011

Collection:
Atlanta University and Clark Atlanta University Theses and Dissertations
Title:
Structural and electronic stability of Russian-doll -style Sc4C2C80, 2011
Creator:
Kah, Cherno Baba
Contributor to Resource:
Wang, Xiao-Qian
Williams, Michael D.
Date of Original:
2011-07-01
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
Recent experimental work reported the synthesis, isolation and characterization of a Russian-doll-style endohedral fullerene, encompassing a carbon dimer within a scandium tetrahedron, all encased by a C80 cage. We have first investigated the equilibrium conformations and the associated charge transfer of the endohedral fullerene Sc4C2C80 based on first-principles density functional calculations; and secondly its electronic properties based on first-principles density functional calculations coupled with many-body GW correction. In the first part our results show that a distorted tetrahedron Sc4 cluster enfolding around the C2 dimer has the desired electronic structure that leads to efficient charge transfer to the open-shell icosahedral C80. A detailed analysis of the charge transfer between the Sc4C2 configurations and the icosahedral C80 cage indicate that the structural stability of the Russian-doll structured Sc4C2@C80 can be attributed to the donor-acceptor effects. In the second part, the calculation results yield a GW rectified gap of 1.8 eV for the Russian-doll structured Sc4C2@C80, in very good conformity with experimental observed value of 1.6 eV. The calculated electronic characteristics of the Russian-doll fullerene reveal distinct shell structures which are embellished in the GW approach. The analysis of vibrational frequency demonstrates profound hybridizations associated with the interactions between the Sc4C2 core and the C80 shell.
Metadata URL:
http://hdl.handle.net/20.500.12322/cau.td:2011_kah_cherno_b
Language:
eng
Holding Institution:
Clark Atlanta University
Rights:
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