Publications

The origin of room temperature ferromagnetism mediated by Co-VZn complexes in the ZnO grain boundary

Year: 2016

Authors: Assa Aravindh Sasikalav Devi, Iman Salem Roqan

Dilute Magnetic Semiconductor Materials
Ferromagnetism
ZnO

The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films

Year: 2016

Authors: S. Venkatesh, A. Baras, J.-S. Lee, Iman Salem Roqan

Zinc Oxide Films
Magnetoresistance
Polarons
Percolation

Identifying the influence of the intrinsic defects in Gd-doped ZnO thin-films

Year: 2016

Authors: T. H. Flemban, M. C. Sequeira, Zhenkui Zhang, S. Venkatesh, E. Alves, K. Lorenz, Iman Salem Roqan

Zinc
Zinc Oxide Films
Lattice constants
Doping

Defect-band mediated ferromagnetism in Gd-doped ZnO thin films

Year: 2015

Authors: S. Venkatesh, J. B. Franklin, M. P. Ryan, J.-S. Lee, H. Ohldag, M. A. McLachlan, N. M. Alford, Iman Salem Roqan

Thin Films

Defect induced d0 ferromagnetism in a ZnO grain boundary

Year: 2015

Authors: Assa Aravindh Sasikalav Devi, Udo Schwingenschloegl, Iman Salem Roqan

Zinc
Vacancies
Ferromagnetism
Zinc Oxide Films

Defect-impurity complex induced long-range ferromagnetism in GaN nanowires

Year: 2015

Authors: Assa Aravindh Sasikalav Devi, Iman Salem Roqan

GaN Nanowire
Density Functional Theory
Magnetism
Electronic Structure

Homogeneous vertical ZnO nanorod arrays with high conductivity on an in situ Gd nanolayer

Year: 2015

Authors: Tahani Hassan Flemban, Venkatesh Singaravelu, Assa Aravindh Sasikalav Devi, Iman Salem Roqan

ZnO
Nanorods

−201 β-Gallium oxide substrate for high quality GaN materials

Year: 2015

Authors: Iman Salem Roqan, Mufasila Mumthaz Muhammed

GaN
Ga203
LED
High Efficiency
Optical Properties

Obtaining strong ferromagnetism in diluted Gd-doped ZnO thin films through controlled Gd-defect complexes

Year: 2015

Authors: Iman Salem Roqan, S. Venkatesh, Zhenkui Zhang, S. Hussain, Ioannis Bantounas, J. B. Franklin, T. H. Flemban, B. Zou, J.-S. Lee

Zinc Oxide Films
Doping
Magnetic Films
Zinc

Thin Film growth and characterization of Ti doped ZnO by RF/DC magnetron sputtering

Year: 2014

Authors: M. B. Haider, M. F. Al-Kuhaili, S. M. A. Durrani, S. Venkatesh, Iman Salem Roqan

Ti doped ZnO

Ferromagnetism in Gd doped ZnO nanowires: A first principles study

Year: 2014

Authors: Assa Aravindh, Udo Schwingenschloegl, Iman Salem Roqan

Gd doped ZnO

Structural and magnetic properties of Gd-doped ZnO

Year: 2014

Authors: Ioannis Bantounas, Venkatesh Singaravelu, Iman Salem Roqan, Udo Schwingenschloegl

Gd doped ZnO
Density Functional Theory

Vacancy complexes induce long-range ferromagnetism in GaN

Year: 2014

Authors: Zhenkui Zhang, Udo Schwingenschloegl, Iman Salem Roqan

Vacancies
III-V semiconductors
Ferromagnetism
Density functional
Antiferromagnetism

Possible mechanism for d0 ferromagnetism mediated by intrinsic defects

Year: 2014

Authors: Zhenkui Zhang, Udo Schwingenschloegl, Iman Salem Roqan

Zn vacancies
ZnS Nanostructures
Intrinsic Defects
Density Functional Theory

Excitonic localization in AlN-rich AlxGa1−xN/AlyGa1−yN multi-quantum-well grain boundaries

Year: 2014 ISSN:0003-6951

Authors: Idris A. Ajia, P. R. Edwards, Z. Liu, J.C. Yan, R.W. Martin, Iman Salem Roqan

Multiple Quantum Wells
Grain boundaries
Photoluminescence
Excitons

High optical and structural quality of GaN epilayers grown on

Year: 2014

Authors: Mufasila Mumthaz Muhammed, M. Peres, Y. Yamashita, Y. Morishima, S. Sato, N. Franco, K. Lorenz, A. Kuramata, Iman Salem Roqan

III-V semiconductors
Epitaxy
X-Ray Diffraction
Photoluminescence

Neocellularization and neovascularization of nanosized bioactive glass-coated decellularized trabecular bone scaffolds

Year: 2013

Authors: L-C. Gerhardt, K. L. Widdows, M. M. Erol, A. Nandakumar, Iman Salem Roqan, T. Ansari, A. R. Boccaccini

Decellularized Bone
Scaffold
Bioactive glass
Angiogenesis
Coating
Vascular endothelial growth factor
Stereology
Vascularisation

Hydrocarbon analysis using desorption atmospheric pressure chemical ionization

Year: 2013

Authors: Fred P.M. Jjunju, Abraham K. Badu-Tawiah, Anyin Li, Santosh Soparawalla, Iman Salem Roqan, R. Graham Cooks

Ambient Ionization Mass Spectrometry
Petroleum Constituents
Charge Exchange
Ion-Molecule reactions
Polynuclear Aromatics
Fuels

In situ analysis of corrosion inhibitors using a portable mass spectrometer with paper spray ionization

Year: 2013

Authors: Fred P.M. Jjunju, Anyin Li, Abraham K. Badu-Tawiah, Pu Wei, Linfan Li, Zheng Ouyang, Iman Salem Roqan, R. Graham Cooks

Mass Spectrometer
Corrosion Inhibitor

Sequential multiple-step europiumion implantation and annealing of GaN

Year: 2013

Authors: S. M. C. Miranda, P. R. Edwards, K.P. O’Donnell, M. Bockowski, E. Alves, Iman Salem Roqan, A. Vantomme, K. Lorenz

Gallium Nitride
Ion Implantation
Crystal Quality
Europium

Publications

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