One of our latest publications is When anatase nanoparticles become bulk-like: Properties of realistic TiO2 nanoparticles in the 1 – 6 nm size range from all-electron relativistic density functional theory based calculations (O. Lamiel-Garcia, K. C. Ko, J. Y. Lee, S. T. Bromley, F. Illas, J. Chem. Theory and Comput., 13 1785 (2017)).

Photocatalysis by TiO2 anatase nanoparticles has an immense number of applications even if this process is triggered by UV radiation. This feature precludes its use under sunlight since only a fraction of UV radiation reaches the Earth surface. Modifying TiO2 nanoparticles so as to have activity in the sunlight is paramount; imagine simply that by a suitable modification one can use these nanoparticles and sunlight to split water into H2 and O2 that can recombine in a exothermic reaction. The implications are obvious: a clean, inexhaustible source of energy and no more greenhouse emissions. Clearly, obtaining such a “philosopher stone” and motivated a huge research effort from theory and experiment. Unfortunately, this goal seems to be a complex one and required understanding at an atomic level. Even more, it requires realistic models going beyond those employed in surface science and solid state studies which make use of periodic symmetry so as to be able to address the importance of nanoparticles size in defining the photocatalytic activity. Here, we used state of the art computational methods with hybrid density functional theory to address the important question of at what size these nanoparticles become bulk-like. Our results show that, for realistic morphologies, electronic structure properties, and hence reactivity, for the large anatase nanoparticles considered in this study, containing up to 1,365 atoms, will be similar to those exhibited by even larger mesoscale particles or by bulk system and present convincing evidence that anatase nanoparticles become effectively bulk-like when reaching a size of ~20 nm diameter.

Details on the models of the different nanoparticles such as those displayed in the above images can be obtained from the NOMAD Archive.

Open access versions of our publications can be accessed from the PDF links below. In some cases, the publications will be available soon, after the publisher embargo.


F. Haque, S. Chenot, S. Stankic, J. Jupille, F. Viñes, F. Illas
ZnO Powders As Multi-Facet Single Crystals
Phys. Chem. Chem. Phys. 19, 10622 (2017). PDF available after April 2018

O. Lamiel-Garcia, K. C. Ko, J. Y. Lee, S. T. Bromley, F. Illas,
When anatase nanoparticles become bulk-like: Properties of realistic TiO2 nanoparticles in the 1 – 6 nm size range from all-electron relativistic density functional theory based calculations
J. Chem. Theory and Comput. 13, 1785 (2017). PDF available after April 2018

F. Viñes, O. Lamiel-Garcia, F. Illas, S. T. Bromley
Size Dependent Structural and Polymorphic Transitions in ZnO: from Nanocluster to Bulk
Nanoscale 9, 10067 (2017). PDF

M. Boley, B. R. Goldsmith, L. M. Ghiringhelli, J. Vreeken
Identifying consistent statements about numerical data with dispersion-corrected subgroup discovery
Data Min. Knowl. Discov. (2017). PDF

R. García-Hernández, D. Kranzlmüller
Virtual Reality Toolset for Material Science: NOMAD VR Tools
International Conference on Augmented Reality, Virtual Reality and Computer Graphics, AVR 2017: Augmented Reality, Virtual Reality, and Computer Graphics, 309-319. PDF

A. Glielmo, P. Sollich, A. De Vita
Accurate interatomic force fields via machine learning with covariant kernels
Phys. Rev. B 95, 214302 (2017). PDF

X. Liu, C. Kunkel, P. Ramírez de la Piscina, N. Homs, F. Viñes, F. Illas
Effective and Highly Selective CO Generation
from CO2 Using a Polycrystalline a-Mo2C Catalyst
ACS Catalysis 7, 4323 (2017). PDF available after May 2018

H. Shang, C. Carbogno, P. Rinke, M. Scheffler
Lattice Dynamics Calculations based on Density-functional Perturbation Theory in Real Space

Comp. Phys. Comm. 215, 26 (2017). PDF

A. Bhattacharya, C. Carbogno, B. Böhme, M. Baitinger, Y. Grin, M. Scheffler
Formation of Vacancies in Si- and Ge-based Clathrates: Role of Electron Localization and Symmetry Breaking,
Phys. Rev. Lett. 118, 236401 (2017). PDF

C. Carbogno, R. Ramprasad, M. Scheffler
Ab Initio
Green-Kubo Approach for the Thermal Conductivity of Solids
Phys. Rev. Lett. 118, 175901 (2017). PDF

M. Gjerding, K. S. Thygesen
Band structure engineered layered metals for low-loss plasmonics
Nature Commun. 8, 15133 (2017). PDF

M. Troppenz, S. Rigamonti, C. Draxl
Predicting Ground-State Configurations and Electronic Properties of the Thermoelectric Clathrates Ba8AlxSi46–x and Sr8AlxSi46–x

Chem. Mater 29, 2414 (2017). PDF

N.P. Bellafont, F. Viñes, W. Hieringer, F. Illas
Predicting core level binding energies shifts: Suitability of the projector augmented wave approach as implemented in VASP
J. Comput. Chem. 38, 518  (2017). PDF available after January 2018

F. Viñes, F. Illas
Electronic structure of stoichiometric and reduced ZnO from periodic relativistic all electron hybrid density functional calculations using numeric atom-centered orbitals
J. Comput. Chem. 38, 523 (2017). PDF available after January 2018

F. Viñes, O. Lamiel-Garcia, K.C. Ko, J.Y. Lee, F. Illas
Systematic study of the effect of HSE functional internal parameters on the electronic structure and band gap of a representative set of metal oxides
J. Comput. Chem. 38, 781 (2017). PDF available after March 2018

P. Janthon, F. Viñes, J. Sirijaraensre, J. Limtrakul, F. Illas
Adding Pieces to the CO/Pt(111) Puzzle: The Role of Dispersion
J. Phys. Chem. C 121, 3970 (2017). PDF available after Feb 2018

S. Posada-Pérez, F. Viñes, R. Valero, J.A. Rodriguez, F. Illas
Adsorption and dissociation of molecular hydrogen on orthorhombic beta-Mo2C and cubic delta-MoC (001) surfaces

Surf. Sci. 656, 24 (2017). PDF

O. Lamiel-Garcia, A. Cuko, M. Calatayud, F. Illas, S. T. Bromley
Predicting size-dependent emergence of crystallinity in nanomaterials: titania nanoclusters versus nanocrystals
Nanoscale 9, 1049 (2017). PDF

A. Cuko, A. Macià, M. Calatayud, S. T. Bromley
Global optimisation of hydroxylated silica clusters: A cascade Monte Carlo Basin Hopping approach,
Comp. Theor. Chem. 1102, 38 (2017). PDF available after embargo

M. A. Zaidan, F. F. Canova, L. Laurson, A. S. Foster
Mixture of Clustered Bayesian Neural Networks for Modeling Friction Processes at the Nanoscale
J. Chem. Theory Comput. 13, 3 (2017). PDF

L. M. Ghiringhelli, J. Vybiral, E. Ahmetcik, R. Ouyang, S. V. Levchenko, C. Draxl, M. Scheffler
Learning physical descriptors for materials science by compressed sensing
New J. Phys. 19 023017 (2017). PDF 

B. R Goldsmith, M. Boley, J. Vreeken, M. Scheffler, L. M. Ghiringhelli
Uncovering structure-property relationships of materials by subgroup discovery,
New J. Phys. 19 013031 (2017). PDF

A. Hjorth Larsen, J. Jørgen Mortensen, J. Blomqvist et al. 
The Atomic Simulation Environment — A Python library for working with atoms
Psi-k Scientific Highlight Of The Month Jan 2017 No. 134  (2017). PDF



K. Lejaeghere et al.
Reproducibility in density functional theory calculations of solids
Science 351, aad3000-1 (2016). PDF (Reprint download password: Fritz-Haber)

D. Reta, I. de P. R. Moreira, F. Illas
Magnetic Coupling Constants in Three Electrons Three Centers Problems from Effective Hamiltonian Theory and Validation of Broken Symmetry-Based Approaches
J. Chem. Theory Comput. 12, 3228 (2016). PDF

S. Posada-Pérez, P. J. Ramírez, J. Evans, F. Viñes, P. Liu, F. Illas, J. A. Rodriguez
Highly Active Au/δ-MoC and Cu/δ-MoC Catalysts for the Conversion of CO2: The Metal/C Ratio as a Key Factor Defining Activity, Selectivity, and Stability 
J. Am. Chem. Soc. 138, 8269 (2016). PDF

D. Cho, K. Chul Ko, O. Lamiel-García, S. T. Bromley, J. Yong Lee, F. Illas
Effect of Size and Structure on the Ground-State and Excited-State Electronic Structure of TiO2 Nanoparticles

J. Chem. Theory Comput. 12, 3751 (2016). PDF

L. M. Ghiringhelli, C. Carbogno, S. Levchenko, F. Mohamed, G. Huhs, M. Lueders, M. Oliveira, M. Scheffler
Towards a Common Format for Computational Materials Science Data
Psi-k Scientific Highlight Of The Month, July No. 131 (2016). PDF

K.C. Ko, O. Lamiel-Garcia, J.Y. Lee, F. Illas
Performance of a modified hybrid functional in the simultaneous description of stoichiometric and reduced TiO2 polymorphs
Phys. Chem. Chem. Phys. 18, 12357 (2016). PDF

H. Muñoz-Galán, F. Viñes, J. Gebhardt, A. Görling, F. Illas
The contact of graphene with Ni(111) surface: description by modern dispersive forces approaches
Theor. Chem. Acc. 135, 165 (2016). PDF

S. Kim, K.C. Ko, J.Y. Lee, F. Illas
Single oxygen vacancies of (TiO2)35 as a prototype reduced nanoparticle: implication for photocatalytic activity
Phys. Chem. Chem. Phys. 18, 23755 (2016). PDF

H. Prats, P. Gamallo, F. Illas, R. Sayos
Comparing the catalytic activity of the water gas shift reaction on Cu(321) and Cu(111) surfaces: Step sites do not always enhance the overall reactivity
J. Catal. 342, 75 (2016). PDF available after Oct 2018

F. Viñes, M. Bernechea, G. Konstantatos, F. Illas
Matildite versus schapbachite: First-principles investigation of the origin of photoactivity in AgBiS2
Phys. Rev. B 94 235203 (2016). PDF