Atomic-scale observation of dynamical fluctuation and three-dimensional structure of gold clusters

Li, Junjie; Yin, Deqiang; Chen, Chun Lin; Li, Qiang; Lin, Liyang; Sun, Rong; Huang, Sumei; Wang, Zhongchang

doi:10.1063/1.4913452

Cited by 23 publications

(23 citation statements)

References 44 publications

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“…Based on this formula, the icosahedral and decahedral motifs are suggested to be the most favorable shapes for the nanoparticle with a size typically less than 3 nm, whereas the truncated octahedron represents the energetically most preferred shape for a large nanoparticle, typically larger than 3 nm. [53][54][55][56] From Fig. 4i, one can see that the Co-Au dumbbell is indeed transformed to a truncated octahedron after irradiation for ∼1020 s, yet undergoes no alteration afterwards, in line with the computational prediction.…”

Section: Resultssupporting

confidence: 70%

A dewetting route to grow heterostructured nanoparticles based on thin film heterojunctions

Yin

et al. 2015

Nanoscale

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Heterostructured nanoparticles have received considerable attention for their various applications due to their unique and tunable functionalities with respect to their individual bulk constituents. However, the current wet chemical synthesis of multicomponent heterostructured nanoparticles is rather complicated. Here, we report a simple and quick method to fabricate Co-Au dumbbell arrays by dewetting Co/Au heterojunctions on a Si substrate and demonstrate that the Co-Au dumbbells vary in size from 2 to 28 nm. We further show by chemical mapping that Co bells are covered by a pseudomorphic Au wetting layer of ∼4 Å, preventing the bells from oxidation. By controlling the thickness of metal heterojunctions and the annealing time, the morphology of the Co-Au nanoparticle is found to be transformed from the dumbbell to the core shell. This facile route is demonstrated to be useful for fabricating other metal-metal and metal-oxide heterostructures and hence holds technological promise for functional applications.

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Section: Resultssupporting

confidence: 70%

A dewetting route to grow heterostructured nanoparticles based on thin film heterojunctions

Yin

et al. 2015

Nanoscale

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“…However, the fluxionality of the clusters may play a major role in catalysis, 53,54 and therefore our exclusive focus on global minima needed further justification. We calculated the Boltzmann-weighted average of the most energetically favorable structures, as it was made in previous studies.…”

Section: Resultsmentioning

confidence: 99%

Alloying Pt Sub-nano-clusters with Boron: Sintering Preventative and Coke Antagonist?

2015

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Immobilized Pt clusters are interesting catalysts for dehydrogenation of alkanes. However, surface-deposited Pt clusters deactivate rapidly via sintering and coke deposition. The results reported here suggest that adding boron to oxide-supported Pt clusters could be a "magic bullet" against both means of deactivation. The model systems studied herein are pure and B-doped Pt clusters deposited on MgO(100). The nonstoichiometric boride cluster obtained via such alloying is found to anchor to the support via a covalent B−O bond, and the cluster-surface binding is much stronger than in the case of pure Pt clusters. Additionally, B introduces covalency to the intracluster bonding, leading to structural distortion and stabilization. The energy required to dissociate a Pt atom from a boride cluster is significantly larger than that of pure Pt clusters. These energetic arguments lead to the proposal that sintering via both Ostwald ripening and particle coalescence would be discouraged relative to pure Pt clusters. Finally, it is shown that the affinity to C also drops dramatically for borated clusters, discouraging coking and increasing the selectivity of potential cluster catalysts.

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“…In contrast, Au20 is not as fluxional and shows high stability in its pyramidal shape (140). Clearly, the support will play an important role in a cluster's fluxionality, facilitating or hindering certain morphologies (141). Theoretically approaching these effects is not simple.…”

Section: Role Of Cluster Fluxionality In Reaction Dynamics-the Latestmentioning

confidence: 99%

Computational Design of Clusters for Catalysis

Jimenez−Izal

Alexandrova

2018

Annu. Rev. Phys. Chem.

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When small clusters are studied in chemical physics or physical chemistry, one perhaps thinks of the fundamental aspects of cluster electronic structure, or precision spectroscopy in ultracold molecular beams. However, small clusters are also of interest in catalysis, where the cold ground state or an isolated cluster may not even be the right starting point. Instead, the big question is: What happens to cluster-based catalysts under real conditions of catalysis, such as high temperature and coverage with reagents? Myriads of metastable cluster states become accessible, the entire system is dynamic, and catalysis may be driven by rare sites present only under those conditions. Activity, selectivity, and stability are highly dependent on size, composition, shape, support, and environment. To probe and master cluster catalysis, sophisticated tools are being developed for precision synthesis, operando measurements, and multiscale modeling. This review intends to tell the messy story of clusters in catalysis.

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Atomic-scale observation of dynamical fluctuation and three-dimensional structure of gold clusters

Cited by 23 publications

References 44 publications

A dewetting route to grow heterostructured nanoparticles based on thin film heterojunctions

A dewetting route to grow heterostructured nanoparticles based on thin film heterojunctions

Alloying Pt Sub-nano-clusters with Boron: Sintering Preventative and Coke Antagonist?

Computational Design of Clusters for Catalysis

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