Projects per year
Abstract
The response of nanoparticles to exposure to ambient conditions and especially oxidation is fundamental to the application of nanotechnology. Bimetallic platinum–titanium nanoparticles of selected mass, 30 kDa and 90 kDa, were produced using a magnetron sputtering gas condensation cluster source and deposited onto amorphous carbon TEM grids. The nanoparticles were analysed with a Cs-corrected Scanning Transmission Electron Microscope (STEM) in High Angle Annular Dark Field (HAADF) mode. It was observed that prior to full Ti oxidation, Pt atoms were dispersed within a Ti shell. However, after full oxidation by prolonged exposure to ambient conditions prior to STEM, the smaller size 30 kDa particles form a single Pt core and the larger size 90 kDa particles exhibit a multi-core structure. Electron beam annealing induced a single core morphology in the larger particles. First principles density functional theory (DFT) calculations were employed to calculate the lowest energy structure of the Pt–Ti nanoparticles with and without the presence of oxygen. It was demonstrated that, as the concentration of oxygen increases, the lowest energy structure changes from dispersed Pt to multiple Pt cores and finally a single Pt core, which is in good agreement with the experimental observations.
Original language | English |
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Pages (from-to) | 27276-27282 |
Number of pages | 7 |
Journal | RSC Advances |
Volume | 8 |
Issue number | 48 |
DOIs | |
Publication status | Published - 31 Jul 2018 |
Bibliographical note
© 2018, The Royal Society of ChemistryProjects
- 1 Finished
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Non-equilibrium electron-ion dynamics in thin metal-oxide
McKenna, K. P. (Principal investigator)
1/01/13 → 30/04/18
Project: Research project (funded) › Research
Datasets
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Exposure of Mass-Selected Bimetallic Pt-TiO2 to Oxygen explored using the Scanning Transmission Electron Microscopy and Density Functional Theory
McKenna, K. P. (Creator) & Hung, S.-H. (Creator), University of York, 2018
DOI: 10.15124/a0a87163-b553-4077-9371-a97572d97d00
Dataset