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

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

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.

Originalsprog	Engelsk
Tidsskrift	Physical Chemistry Chemical Physics
Vol/bind	16
Nummer	39
Sider (fra-til)	21289-21299
Antal sider	11
ISSN	1463-9076
DOI	https://doi.org/10.1039/c4cp02716g
Status	Udgivet - 1 okt. 2014

Adgang til dokumentet

10.1039/c4cp02716g

http://pubs.rsc.org.ez.statsbiblioteket.dk:2048/en/Content/ArticleLanding/2014/CP/C4CP02716G#!divAbstract

Citationsformater

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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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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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SN - 1463-9076

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EP - 21299

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

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