Formation and sintering of Pt nanopartictes on vicinal rutile TiO2 surfaces

Felix Rieboldt; S. Helveg; Ralf Bechstein; Lutz Lammich; Flemming Besenbacher; Jeppe Vang Lauritsen; Stefan Wendt

doi:10.1039/c4cp02716g

Formation and sintering of Pt nanopartictes on vicinal rutile TiO₂ surfaces

Felix Rieboldt, S. Helveg, Ralf Bechstein, Lutz Lammich, Flemming Besenbacher, Jeppe Vang Lauritsen, Stefan Wendt

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

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Abstract

By means of scanning tunnelling microscopy (STM) the nucleation, growth and sintering of platinum nanoparticles (Pt NP's) was studied on vicinal and flat rutile titanium dioxide (TiO2) surfaces. Utilising physical vapour deposition, the nucleation of Pt NP's on TiO2 surfaces at room temperature (RT) was found to be random and invariant towards different surface morphologies and reduction states. Thus, the nucleation of Pt on TiO2 at RT is rather insensitive to the surface structure and surface defects. Vacuum-annealing at 600 K, 700 K and 800 K, respectively, led to lower densities of Pt NP's as a result of sintering. Sintering occurred at different rates at the TiO2 surfaces studied, indicating that the surface morphology and the amount of Ti3+ excess charge do have an influence on the particle stability. Observed changes in the NP distribution as a result of sintering can be explained inferring facile diffusion of Pt NP's along the [001] direction.

Original language	English
Journal	Physical Chemistry Chemical Physics
Volume	16
Issue	39
Pages (from-to)	21289-21299
Number of pages	11
ISSN	1463-9076
DOIs	https://doi.org/10.1039/c4cp02716g
Publication status	Published - 1 Oct 2014

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Cite this

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title = "Formation and sintering of Pt nanopartictes on vicinal rutile TiO2 surfaces",

abstract = "By means of scanning tunnelling microscopy (STM) the nucleation, growth and sintering of platinum nanoparticles (Pt NP's) was studied on vicinal and flat rutile titanium dioxide (TiO2) surfaces. Utilising physical vapour deposition, the nucleation of Pt NP's on TiO2 surfaces at room temperature (RT) was found to be random and invariant towards different surface morphologies and reduction states. Thus, the nucleation of Pt on TiO2 at RT is rather insensitive to the surface structure and surface defects. Vacuum-annealing at 600 K, 700 K and 800 K, respectively, led to lower densities of Pt NP's as a result of sintering. Sintering occurred at different rates at the TiO2 surfaces studied, indicating that the surface morphology and the amount of Ti3+ excess charge do have an influence on the particle stability. Observed changes in the NP distribution as a result of sintering can be explained inferring facile diffusion of Pt NP's along the [001] direction.",

author = "Felix Rieboldt and S. Helveg and Ralf Bechstein and Lutz Lammich and Flemming Besenbacher and Lauritsen, {Jeppe Vang} and Stefan Wendt",

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TY - JOUR

T1 - Formation and sintering of Pt nanopartictes on vicinal rutile TiO2 surfaces

AU - Rieboldt, Felix

AU - Helveg, S.

AU - Bechstein, Ralf

AU - Lammich, Lutz

AU - Besenbacher, Flemming

AU - Lauritsen, Jeppe Vang

AU - Wendt, Stefan

PY - 2014/10/1

Y1 - 2014/10/1

N2 - By means of scanning tunnelling microscopy (STM) the nucleation, growth and sintering of platinum nanoparticles (Pt NP's) was studied on vicinal and flat rutile titanium dioxide (TiO2) surfaces. Utilising physical vapour deposition, the nucleation of Pt NP's on TiO2 surfaces at room temperature (RT) was found to be random and invariant towards different surface morphologies and reduction states. Thus, the nucleation of Pt on TiO2 at RT is rather insensitive to the surface structure and surface defects. Vacuum-annealing at 600 K, 700 K and 800 K, respectively, led to lower densities of Pt NP's as a result of sintering. Sintering occurred at different rates at the TiO2 surfaces studied, indicating that the surface morphology and the amount of Ti3+ excess charge do have an influence on the particle stability. Observed changes in the NP distribution as a result of sintering can be explained inferring facile diffusion of Pt NP's along the [001] direction.

AB - By means of scanning tunnelling microscopy (STM) the nucleation, growth and sintering of platinum nanoparticles (Pt NP's) was studied on vicinal and flat rutile titanium dioxide (TiO2) surfaces. Utilising physical vapour deposition, the nucleation of Pt NP's on TiO2 surfaces at room temperature (RT) was found to be random and invariant towards different surface morphologies and reduction states. Thus, the nucleation of Pt on TiO2 at RT is rather insensitive to the surface structure and surface defects. Vacuum-annealing at 600 K, 700 K and 800 K, respectively, led to lower densities of Pt NP's as a result of sintering. Sintering occurred at different rates at the TiO2 surfaces studied, indicating that the surface morphology and the amount of Ti3+ excess charge do have an influence on the particle stability. Observed changes in the NP distribution as a result of sintering can be explained inferring facile diffusion of Pt NP's along the [001] direction.

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DO - 10.1039/c4cp02716g

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