Gubó, R;
Yim, CM;
Allan, M;
Pang, CL;
Berkó, A;
Thornton, G;
(2017)
Variation of SMSI with the Au:Pd Ratio of Bimetallic
Nanoparticles on TiO2(110).
Topics in Catalysis
10.1007/s11244-017-0854-5.
(In press).
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Abstract
Au/Pd nanoparticles are important in a number of catalytic processes. Here we investigate the formation of Au–Pd bimetallic nanoparticles on TiO 2 (110) and their susceptibility to encapsulation using scanning tunneling microscopy, as well as Auger spectroscopy and low energy electron diffraction. Sequentially depositing 5 MLE Pd and 1 MLE Au at 298 K followed by annealing to 573 K results in a bimetallic core and Pd shell, with TiO x encapsulation on annealing to ~ 800 K. Further deposition of Au on the pinwheel type TiO x layer results in a template-assisted nucleation of Au nanoclusters, while on the zigzag type TiO x layer no preferential adsorption site of Au was observed. Increasing the Au:Pd ratio to 3 MLE Pd and 2 MLE Au results in nanoparticles that are enriched in Au at their surface, which exhibit a strong resistance towards encapsulation. Hence the degree of encapsulation of the nanoparticles during sintering can be controlled by tuning the Au:Pd ratio.
| Type: | Article |
|---|---|
| Title: | Variation of SMSI with the Au:Pd Ratio of Bimetallic Nanoparticles on TiO2(110) |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/s11244-017-0854-5 |
| Publisher version: | http://doi.org/10.1007/s11244-017-0854-5 |
| Language: | English |
| Additional information: | © 2017 The Author(s). This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
| Keywords: | Core–shell nanoparticles; Au–Pd alloys; Scanning tunneling microscopy; SMSI; Encapsulation |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10026200 |
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