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.com
Volume 5, Issue 6 (Suppl)
J Mat. Sci.
ISSN: 2321-6212
Advanced Materials 2017
October 26-28, 2017
OCTOBER 26-28, 2017 OSAKA, JAPAN
13
TH
INTERNATIONAL CONFERENCE ON
Advanced Materials and Nanotechnology
Influence of reaction gases on the structural and optical characteristics of Ce-oxide thin film coatings
Zainab N Jaf
1, 2
, Hussein A Miran
1, 2
, Zhong-Tao Jiang
1
, Jean-Pierre Veder
3
and Mohammed Noor Altarawneh
1
1
Murdoch University, Australia
2
University of Bagdad, Iraq
3
Curtin University, Australia
C
e-oxide thin film coatings present unique optical properties. In this study, structural, chemical bonding and optical
properties of the thin films in relation to the composition of reaction gas via sputtering process were investigated. All the
thin films exhibited a polycrystalline character with cubic fluorite-structure for cerium dioxide along (111), (200) and (222)
orientations. XPS analysis revealed that two oxidation states of CeO
2
and Ce
2
O
3
are present in the films prepared at lower
argon-oxygen flow ratios, whereas the films are totally oxidized into CeO
2
as the aforementioned ratio increases. Optical
parameters (α, ε1, ε2, n and k) derived from UV-Vis reflectance data indicate that the thin films have indirect optical band gaps
in the range of 2.25-3.1 eV. Density Functional Theory (DFT+U) implemented in the Cambridge Serial Total Energy Package
(CASTEP) has been employed to model some optical properties of CeO
2
cluster at ground state. The simulated electronic
Density of State (DOS) of the relaxed structure of CeO
2
demonstrates a band gap, agrees well with the measured optical band
gap. The experimental and calculated absorption coefficient (α), have analogous trends and to some extent a similar range of
values in the wave length. All in all, our theoretical findings consistently support the experimental results.
Biography
Zainab N Jaf has completed her Master’s degree from College of Education for Pure Sciences/Ibn Al-Haitham, Department of Physics, University of Bagdad, Iraq.
She is currently pursuing her PhD degree.
z.jaf@Murdoch.edu.auZainab N Jaf et al., J Mat. Sci. 2017, 5:6
DOI: 10.4172/2321-6212-C1-009