The nucleation, growth, and stability of oxide-supported metal clusters

Wallace, William T.; Min, Byoung Koun; Goodman, D. W.

doi:10.1007/s11244-005-3786-4

Cited by 96 publications

(88 citation statements)

References 89 publications

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“…[12,15] for Cu/ZnO), the slopes of these curves change with v Au , indicating a variation in the growth mode of the Au cluster. In agreement with prior studies, [13,14] one can conclude that Au initially formed small two-dimensional (2D) clusters, which grew into wider and taller three-dimensional (3D) structures with increasing Au exposure. Therefore, due to screening effects, the AES intensity increased more slowly with v Au after 3D clusters began to form.…”

Section: Data Presentation and Discussionsupporting

confidence: 91%

“…Here we form more catalytically active sites and S 0 initially increases. However, increasing v Au after the nucleation regime (and within the 2D cluster growth range) results in an increase in the cluster size, but the cluster density remains essentially constant [13,16]. Thus, the fraction of lowcoordinated gold sites decreases and S 0 decreases [22].…”

Section: Data Presentation and Discussionmentioning

confidence: 97%

“…The silica support was cleaned by Ar ? sputtering and annealing in O 2 at 1,100-1,200 K, following previously published procedures [13]. Scanning electron microscopy (SEM) images were collected at Argonne National Laboratory with a JEOL JSM-7500F and at Brookhaven National Laboratory with a Hitachi S-4800 UHR.…”

Section: Methodsmentioning

confidence: 99%

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Adsorption Dynamics of CO on Silica Supported Gold Clusters: Cluster Size Effects in Molecular Beam Scattering Experiments

Kadossov

Burghaus

2010

Catal Lett

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Section: Data Presentation and Discussionsupporting

confidence: 91%

Section: Data Presentation and Discussionmentioning

confidence: 97%

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Adsorption Dynamics of CO on Silica Supported Gold Clusters: Cluster Size Effects in Molecular Beam Scattering Experiments

Kadossov

Burghaus

2010

Catal Lett

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“…4, 5) confirmed that nitrogen doping of anatase TiO 2 creates oxygen vacancies (point defects). Defects on metal-oxide supports play an essential role as metal cluster nucleation sites [27]. It has been reported that oxygen vacancies on MgO are essential for the nucleation of active Au clusters [28,29].…”

Section: Discussionmentioning

confidence: 99%

CO Oxidation over Anatase TiO2 Supported Au: Effect of Nitrogen Doping

Sakthivel¹,

Ntho²,

Witcomb³

et al. 2009

Catal Lett

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Nitrogen doped yellowish anatase phase of titania support (TiO 2-x N x ) was prepared by hydrolysis of titanium (IV) butoxide with 15% NH 4 OH followed by filtration, drying and calcination at 450°C for 3 h. For comparison, TiO 2 was prepared by hydrolysing titanium (IV) butylate with distilled water. Deposition precipitation method was used for Au loading on TiO 2-x N x and TiO 2 . These were characterised by XRD, Laser Raman spectroscopy, transmission electron microscopy, BET surface area analyser, and UV-visible spectrophotometry. UVvisible (diffused reflectance) spectrum of TiO 2-x N x support shows a distinct absorption band around 450 nm wavelength indicating for N doping. Whereas, TiO 2 does not show any absorption band in the visible region. The activity of gold loaded on these supports was tested for CO oxidation reaction. Effect of different pre-treatment conditions and effect of moisture on these catalysts were studied, and the results obtained were interpreted on the basis of nitrogen doping, optoelectronic properties, ability of oxygen uptake of the support and particle size of gold.

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“…Furthermore, STM has also made it possible to observe adsorption of gas-phase molecules onto nanoclusters-substrate systems in real time and to explore the effect of edge states, nanoparticle size and defects on catalytic activity [11,12,13,14]. Finally, the effects of edges [15], kinks [16], atomic vacancies [17,18] and other defects have been probed and are now known to play a large role in catalytic performance. It is therefore paramount to understand the growth behavior of such nanoparticles and to be able to control the size, morphology and distribution of these active sites in order to test and optimise the catalytic capability.…”

Section: Introductionmentioning

confidence: 99%

Nanoclusters and nanolines: the effect of molybdenum oxide substrate stoichiometry on iron self-assembly

et al. 2017

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Abstract. The growth of Fe nanostructures on the stoichiometric MoO 2 /Mo(110) and oxygen-rich MoO 2+x /Mo(110) surfaces has been studied using lowtemperature scanning tunneling microscopy (STM) and density functional theory calculations. STM results indicate that at low coverage Fe nucleates on the MoO 2 /Mo(110) surface, forming small, well-ordered nanoclusters of uniform size, each consisting of 5 Fe atoms. These 5-atom clusters can agglomerate into larger nanostructures reflecting the substrate geometry but retain their individual character within the structure. Linear Fe nanocluster arrays are formed on the MoO 2 /Mo(110) surface at room temperature when the surface coverage is greater than 0.6 monolayers. These nanocluster arrays follow the direction of the oxide rows of the strained MoO 2 /Mo(110) surface. Slightly altering the preparation procedure of MoO 2 /Mo(110) leads to the presence of oxygen adatoms on this surface. Fe deposition onto the oxygen-rich MoO 2+x /Mo(110) surface results in elongated nanostructures that reach up to 24 nm in length. These nanolines have a zigzag shape and are likely composed of partially oxidized Fe formed upon reaction with the oxygen-rich surface.

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The nucleation, growth, and stability of oxide-supported metal clusters

Cited by 96 publications

References 89 publications

Adsorption Dynamics of CO on Silica Supported Gold Clusters: Cluster Size Effects in Molecular Beam Scattering Experiments

Adsorption Dynamics of CO on Silica Supported Gold Clusters: Cluster Size Effects in Molecular Beam Scattering Experiments

CO Oxidation over Anatase TiO2 Supported Au: Effect of Nitrogen Doping

Nanoclusters and nanolines: the effect of molybdenum oxide substrate stoichiometry on iron self-assembly

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