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Journal articleMukhopadhyay S, Finnis MW, Harrison NM, 2013,
Electronic structures and phonon free energies of LaCoO<sub>3</sub> using hybrid-exchange density functional theory
, PHYSICAL REVIEW B, Vol: 87, ISSN: 1098-0121- Author Web Link
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- Citations: 32
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Journal articleHuesges Z, Mueller C, Paulus B, et al., 2013,
Characterising MgF<sub>2</sub> surfaces with CO adsorption calculations
, SURFACE SCIENCE, Vol: 609, Pages: 73-77, ISSN: 0039-6028- Author Web Link
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- Citations: 19
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Journal articleWu W, Rochford LA, Felton S, et al., 2013,
Magnetic properties of copper hexadecaphthalocyanine (F<sub>16</sub>CuPc) thin films and powders
, JOURNAL OF APPLIED PHYSICS, Vol: 113, ISSN: 0021-8979- Author Web Link
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- Citations: 15
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Journal articleAhmad EA, Mallia G, Kramer D, et al., 2013,
The stability of LaMnO<sub>3</sub> surfaces: a hybrid exchange density functional theory study of an alkaline fuel cell catalyst
, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 1, Pages: 11152-11162, ISSN: 2050-7488- Author Web Link
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- Citations: 25
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Journal articleParkes M, Refson K, d'Avezac M, et al., 2013,
Determining Surface Chemistry and Vibrational Properties of SOFC Anode Materials Through <i>ab initio</i> Calculations
, SOLID OXIDE FUEL CELLS 13 (SOFC-XIII), Vol: 57, Pages: 2419-2427, ISSN: 1938-5862- Author Web Link
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- Citations: 2
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Journal articleRisplendi F, Cicero G, Mallia G, et al., 2013,
A quantum-mechanical study of the adsorption of prototype dye molecules on rutile-TiO<sub>2</sub>(110): a comparison between catechol and isonicotinic acid
, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 15, Pages: 235-243, ISSN: 1463-9076- Author Web Link
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- Citations: 19
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Journal articleMukhopadhyay S, Harrison NM, 2012,
Influence of background carriers on magnetic properties of Mn-doped dilute magnetic Si
, JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, Vol: 324, Pages: 3748-3753, ISSN: 0304-8853- Author Web Link
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- Citations: 4
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Conference paperHarrison N, 2012,
Predictive modeling of solar adsorber materials: Structure, equilibrium defect concentrations, optical and vibrational spectra
, 244th National Fall Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727 -
Journal articlePatel M, Mallia G, Liborio L, et al., 2012,
Water adsorption on rutile TiO<sub>2</sub>(110) for applications in solar hydrogen production: A systematic hybrid-exchange density functional study
, PHYSICAL REVIEW B, Vol: 86, ISSN: 2469-9950- Author Web Link
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- Citations: 22
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Journal articleAhmad EA, Mallia G, Kramer D, et al., 2012,
Comment on "2D Atomic Mapping of Oxidation States in Transition Metal Oxides by Scanning Transmission Electron Microscopy and Electron Energy-Loss Spectroscopy"
, PHYSICAL REVIEW LETTERS, Vol: 108, ISSN: 0031-9007- Author Web Link
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- Citations: 7
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Journal articleFerretti A, Mallia G, Martin-Samos L, et al., 2012,
<i>Ab initio</i> complex band structure of conjugated polymers: Effects of hydrid density functional theory and <i>GW</i> schemes
, PHYSICAL REVIEW B, Vol: 85, ISSN: 2469-9950- Author Web Link
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- Citations: 35
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Journal articleLiborio L, Chew SC, Harrison N, 2012,
Atomic structure of the (001) surface of CuGaSe<sub>2</sub>
, SURFACE SCIENCE, Vol: 606, Pages: 496-504, ISSN: 0039-6028- Author Web Link
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- Citations: 4
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Conference paperWu W, Fisher AJ, Harrison NM, et al., 2012,
Theoretical modeling of the electronic structure and exchange interactions in Cu(II)Pc
, International Conference on Strongly Correlated Electron Systems (SCES), Publisher: IOP PUBLISHING LTD, ISSN: 1742-6588- Author Web Link
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- Citations: 1
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Conference paperBernasconi L, Webster R, Tomic S, et al., 2012,
Optical response of extended systems from time-dependent Hartree-Fock and time-dependent density-functional theory
, 3rd Workshop on Theory, Modelling and Computational Methods for Semiconductor Materials and Nanostructures (TMCS), Publisher: IOP PUBLISHING LTD, ISSN: 1742-6588- Author Web Link
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- Citations: 9
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Conference paperRisplendi F, Cicero G, Mallia G, et al., 2012,
A quantum-mechanical study of ZnO and TiO2 based DSC
, APS March Meeting 2012, Publisher: American Physical SocietySince the pioneering work of Graetzel, Dye Sensitized Cells (DSCs) have attracted great attention as cheap and effective solar power devices based on wide bandgap metal oxide electrode. Optimization of the DSC is a challenging task as it is a highly complex interacting molecular system. Surface properties of the metal-oxide and proper sensitization with dyes may strongly affect the efficiency. Optimizated DSCs based on TiO2 photoanodes and organic dye have reached conversion efficiency of about 10{\%} whereas the efficiency of ZnO based DSC has been found to be much lower, although this material has photochemical properties similar to TiO2, in general due to the nature of the binding between sensitizer and semiconductor. For this reason understanding how anchoring groups interact with the metal-oxide is fundamental to shed light on the different behaviour of these materials in DSC. Aim of this work is to address the binding of small organic sensitizers, such as catechol and isonicotinic acid molecules, to TiO2 and ZnO surfaces, in terms of geometry, stability, electronic structure and absorption properties. To this end, we employed quantum-mechanical simulations based on hybrid DFT and hybrid TDDFT.
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Journal articleAhmad EA, Liborio L, Kramer D, et al., 2011,
Thermodynamic stability of LaMnO<sub>3</sub> and its competing oxides: A hybrid density functional study of an alkaline fuel cell catalyst
, PHYSICAL REVIEW B, Vol: 84, ISSN: 2469-9950- Author Web Link
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- Citations: 37
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Journal articleWu W, Fisher AJ, Harrison NM, 2011,
Theoretical modeling of the electronic structure and exchange interactions in a Cu(II)Pc one-dimensional chain
, PHYSICAL REVIEW B, Vol: 84, ISSN: 2469-9950- Author Web Link
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- Citations: 20
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Journal articleBush IJ, Tomic S, Searle BG, et al., 2011,
Parallel implementation of the <i>ab initio</i> CRYSTAL program: electronic structure calculations for periodic systems
, PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 467, Pages: 2112-2126, ISSN: 1364-5021- Author Web Link
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- Citations: 32
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Journal articleBernasconi L, Tomic S, Ferrero M, et al., 2011,
First-principles optical response of semiconductors and oxide materials
, PHYSICAL REVIEW B, Vol: 83, ISSN: 1098-0121- Author Web Link
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- Citations: 44
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Journal articleScaranto J, Mallia G, Harrison NM, 2011,
An efficient method for computing the binding energy of an adsorbed molecule within a periodic approach. The application to vinyl fluoride at rutile TiO<sub>2</sub>(110) surface
, COMPUTATIONAL MATERIALS SCIENCE, Vol: 50, Pages: 2080-2086, ISSN: 0927-0256- Author Web Link
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- Citations: 45
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Journal articleLiborio LM, Bailey CL, Mallia G, et al., 2011,
Chemistry of defect induced photoluminescence in chalcopyrites: The case of CuAlS<sub>2</sub>
, JOURNAL OF APPLIED PHYSICS, Vol: 109, ISSN: 0021-8979- Author Web Link
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- Citations: 32
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Journal articleMartinez-Casado R, Mallia G, Usvyat D, et al., 2011,
Periodic quantum mechanical simulation of the He-MgO(100) interaction potential
, JOURNAL OF CHEMICAL PHYSICS, Vol: 134, ISSN: 0021-9606- Author Web Link
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- Citations: 30
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Journal articleMartinez-Casado R, Mallia G, Usvyat D, et al., 2011,
He-atom scattering from MgO(100): calculating diffraction peak intensities with a semi <i>ab initio</i> potential
, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 13, Pages: 14750-14757, ISSN: 1463-9076- Author Web Link
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- Citations: 9
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Journal articleMartinez-Casado R, Mallia G, Harrison NM, 2011,
<i>Ab initio</i> calculation of the MgO(100) interaction with He and Ne: a HF+MP2 and HF+MP2(B3LYP) comparison
, CHEMICAL COMMUNICATIONS, Vol: 47, Pages: 11630-11632, ISSN: 1359-7345- Author Web Link
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- Citations: 1
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Conference paperPatel M, Mallia G, Liborio L, et al., 2011,
A Hybrid Density Functional Study of Water Adsorption on Rutile TiO2(110) for Applications in Solar Hydrogen Production
, http://www.nsti.org/procs/Nanotech2011v1/9/W3.183, Nanotech 2011, Publisher: NSTITheoretical and experimental methods are adopted in order to gain further understanding of photocatalytic water splitting over the semiconductor TiO2. Periodic density functional theory calculations are used to study the adsorption of water on the rutile TiO2(110) surface. Results of studying the influence of acidic surface species on the energetics of the system are compared with new experimental measurements of the kinetics (using transient absorption spectroscopy) and photocurrent (photoelectrochemical set-up) as a function of pH.
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Journal articleMartinez-Casado R, Mallia G, Harrison NM, 2011,
An alternative approach for the calculation of correlation energy in periodic systems: a hybrid MP2(B3LYP) study of the He-MgO(100) interaction
, CHEMICAL COMMUNICATIONS, Vol: 47, Pages: 4385-4387, ISSN: 1359-7345- Author Web Link
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- Citations: 6
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Journal articleDe Fusco GC, Montanari B, Harrison NM, 2010,
Half-metallicity in the ferrimagnet Nb(TCNE)<sub>2</sub> from first principles
, PHYSICAL REVIEW B, Vol: 82, ISSN: 1098-0121- Author Web Link
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- Citations: 14
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Journal articleKaur R, Mallia G, Harrison NM, 2010,
A hybrid exchange density functional study of CrO<inf>2</inf> as a spin polarised material for spintronics
, Nanotechnology 2010: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational - Technical Proceedings of the 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010, Vol: 2, Pages: 613-616Hybrid exchange density functional theory calculations have been carried out to investigate the effects of strain due to a distortion of the lattice parameter(s) on the electronic properties of CrO2, a half metallic ferromagnet. The variation in the density of states near the Fermi level for the majority spin states and the bandgap in the minority spin channel are reported. Understanding such variations is vital to study interface properties of heterostructures based on CrO2.
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Journal articleVirk N, Montanari B, Harrison NM, 2010,
Ab-initio investigation of graphane
, Nanotechnology 2010: Advanced Materials, CNTs, Particles, Films and Composites - Technical Proceedings of the 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010, Vol: 1, Pages: 296-299First-principles calculations employing the hybrid exchange functional B3LYP are used to determine the structural parameters, electronic structure and associated properties of a graphene sheet, graphane chair and graphane boat confirmations. Graphane is found to have a band gap corresponding to an electronic insulator at room temperature. The relative performance of the B3LYP functional in comparison to calculations employing generalized gradient approximations (PBE) is also assessed. The B3LYP functional finds the band gap to be almost double that predicted by PBE methods. The choice of functional is found to be insignificant in the determination of the structural parameters.
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Book chapterBailey CL, Mukhopadhyay S, Wander A, et al., 2010,
Predictive Modelling of Aluminium Fluoride Surfaces
, Functionalized Inorganic Fluorides, Editors: Tressaud, Publisher: Wiley, ISBN: 9780470740507
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