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Chen, Z.X.; Smith, Geoff; Putman, Constant A.J.; Voert, E.J.M. ter

doi:10.1023/a:1019062901616

Cited by 6 publications

(6 citation statements)

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“…Sintering of supported catalytically active nanoparticles during chemical reactions at elevated temperatures often leads to the loss of the catalytic activity and selectivity of these particles [1][2][3]. Previous studies of the thermal stability region on a sample of Pt nanoparticles formed upon deposition of non-size selected clusters at a surface coverage of 6.8 · 10 14 (±10%) Pt atoms per cm 2 on SiO 2 /Si(111) (corresponds to 34% of one atomic monolayer) showed the onset of nanoparticle aggregation at around 320°C [4].…”

Section: Introductionmentioning

confidence: 99%

Reactivity of supported platinum nanoclusters studied by in situ GISAXS: clusters stability under hydrogen

et al. 2006

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This paper is an initial study of the reactivity and thermal stability of atomic platinum clusters supported on Al 2 O 3 /SiO 2 /Si(100) as a function of the thickness of the alumina film and presence of hydrogen. Extremely high thermal stability of Pt 7-10 clusters in vacuo as well as in the presence of hydrogen is observed on SiO 2 /Si(100) coated with six cycles of Al 2 O 3 film prepared by an atomic layer deposition technique.

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Section: Introductionmentioning

confidence: 99%

Reactivity of supported platinum nanoclusters studied by in situ GISAXS: clusters stability under hydrogen

et al. 2006

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“…For this purpose, various methods are used to produce and stabilize particles of the desired size in solution before impregnation. 6,7 To deposit particles under vacuum, evaporated metal clusters can be selected according to size in the gas phase. 8 Lithography can be used to create well-ordered arrays of catalytically active material on flat supports.…”

Section: Introductionmentioning

confidence: 99%

“…Since small metal particles on a flat oxide support resemble industrial catalysts, a great effort has been made to improve the deposition of well-defined metal clusters onto flat surfaces. For this purpose, various methods are used to produce and stabilize particles of the desired size in solution before impregnation. , To deposit particles under vacuum, evaporated metal clusters can be selected according to size in the gas phase …”

Section: Introductionmentioning

confidence: 99%

Foils, Films, and Nanostructured Surfaces: A Comparative XPS and AFM Study of Model Catalyst Surfaces

and¹,

Prins²,

Bonetti

2000

J. Phys. Chem. B

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A polycrystalline palladium foil and palladium films of various thickness, supported on oxidized silicon wafers, were treated under catalytic conditions in a gas-flow reactor. Their topography and chemical composition were investigated before and after exposure to oxygen and hydrogen by atomic force microscopy and X-ray photoelectron spectroscopy. The results were compared with those of nanostructured palladium model catalysts measured under the same conditions. The nanostructured samples were prepared on oxidized silicon wafers by laser interference lithography and subsequent metal evaporation. Hydrogen and carbon monoxide oxidation were used as test reactions in a quartz reactor at 1 atm pressure and at temperatures up to 600 °C. All palladium-containing systems were catalytically active after several activation cycles. Nanostructured silver model catalysts were treated in the same way for comparison. The high-temperature treatment at atmospheric pressures in oxygen and hydrogen proved to be highly effective in decontaminating the surface of the catalysts and especially in ridding it of carbon-containing species. Significant changes in the topography of the metal surfaces due to catalytic etching were observed after treatments at 400 and 600 °C in the presence of oxygen and hydrogen. While larger palladium clusters on the flat SiO2 surface tended to sinter and form larger aggregates, the silver particles started to split and spread over the substrate.

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“…[1][2][3] This paper is devoted to the study of the thermal stability of deposited platinum nanoparticles by employing grazing incidence small-angle X-ray scattering technique (GISAXS).…”

Section: Introductionmentioning

confidence: 99%

“…Sintering of supported catalytically active nanoparticles during chemical reactions at elevated temperatures often leads to the loss of the catalytic activity and selectivity of these particles. − This paper is devoted to the study of the thermal stability of deposited platinum nanoparticles by employing grazing incidence small-angle X-ray scattering technique (GISAXS).…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability of Supported Platinum Clusters Studied by in Situ GISAXS

et al. 2004

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Sintering of supported nanocatalysts often leads to the loss of the catalytic activity and selectivity. This paper reports on synchrotron X-ray studies of the thermal stability of supported platinum nanoparticles produced by cluster deposition on the naturally oxidized surface of a silicon wafer (SiO 2 /Si(111)). The temperature region of aggregation was determined by gradually heating the samples up to above 400 °C, and recording two-dimensional in situ X-ray scattering images during the heat treatment. The data analysis reveals an unexpectedly high stability of the supported particles, which preserve their original size up to about 320 °C, at which an abrupt onset of the agglomeration takes place.

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Untitled

Cited by 6 publications

References 0 publications

Reactivity of supported platinum nanoclusters studied by in situ GISAXS: clusters stability under hydrogen

Reactivity of supported platinum nanoclusters studied by in situ GISAXS: clusters stability under hydrogen

Foils, Films, and Nanostructured Surfaces: A Comparative XPS and AFM Study of Model Catalyst Surfaces

Thermal Stability of Supported Platinum Clusters Studied by in Situ GISAXS

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