Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/118828
Title: | Predicting size-dependent emergence of crystallinity in nanomaterials: titania nanoclusters versus nanocrystals |
Author: | Lamiel Garcia, Josep Oriol Cuko, Andi Calatayud, Mònica Illas i Riera, Francesc Bromley, Stefan Thomas |
Keywords: | Diòxid de titani Nanopartícules Nanocristalls semiconductors Nanoestructures Titanium dioxide Nanoparticles Semiconductor nanocrystals Nanostructures |
Issue Date: | 21-Jan-2017 |
Publisher: | Royal Society of Chemistry |
Abstract: | Bottom-up and top-down derived nanoparticle structures refined by accurate ab initio calculations are used to investigate the size dependent emergence of crystallinity in titania from the monomer upwards. Global optimisation and data mining are used to provide a series of ( TiO2) N global minima candidates in the range N = 1-38, where our approach provides many new low energy structures for N > 10. A range of nanocrystal cuts from the anatase crystal structure are also considered up to a size of over 250 atoms. All nanocrystals considered are predicted to be metastable with respect to non-crystalline nanoclusters, which has implications with respect to the limitations of the cluster approach to modelling large titania nanosystems. Extrapolating both data sets using a generalised expansion of a top-down derived energy expression for nanoparticles, we obtain an estimate of the non-crystalline to crystalline crossover size for titania. Our results compare well with the available experimental results and imply that anatase-like crystallinity emerges in titania nanoparticles of approximately 2-3 nm diameter. |
Note: | Reproducció del document publicat a: https://doi.org/10.1039/c6nr05788h |
It is part of: | Nanoscale, 2017, vol. 9, num. 3, p. 1049-1058 |
URI: | http://hdl.handle.net/2445/118828 |
Related resource: | https://doi.org/10.1039/c6nr05788h |
ISSN: | 2040-3364 |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) Publicacions de projectes de recerca finançats per la UE |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
673116.pdf | 5.28 MB | Adobe PDF | View/Open |
This item is licensed under a Creative Commons License