Catalytically Active Gold: From Nanoparticles to Ultrathin Films

Chen, Mingshu; Goodman, D. W.

doi:10.1002/chin.200701227

Cited by 62 publications

(95 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A natural motivation for this study comes from the relevance of both Au and Ag for catalysis, e.g., Ag for ethylene epoxidation and Au for oxidation reactions (6,24). The two metals are similar.…”

Section: Au On Nial(110) and Comparison With Ag On Nial(110)mentioning

confidence: 99%

See 1 more Smart Citation

Self-assembly of metal nanostructures on binary alloy surfaces

Duguet

Han²,

Yuen

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

Deposition of metals on binary alloy surfaces offers new possibilities for guiding the formation of functional metal nanostructures. This idea is explored with scanning tunneling microscopy studies and atomistic-level analysis and modeling of nonequilibrium island formation. For Au/NiAl(110), complex monolayer structures are found and compared with the simple fcc(110) bilayer structure recently observed for Ag/NiAl(110). We also consider a more complex codeposition system, ðNi þ AlÞ∕NiAlð110Þ, which offers the opportunity for fundamental studies of self-growth of alloys including deviations for equilibrium ordering. A general multisite lattice-gas model framework enables analysis of structure selection and morphological evolution in these systems.S elf-assembly involves the autonomous organization of components into structures (1). This process requires mobility of aggregating components, and usually occurs on smooth surfaces or in fluids. Some degree of relaxation in the aggregated state is typically also operative. Self-assembly can be manifested in either complex equilibrium structures, e.g., reflecting competing interactions, or in far-from-equilibrium growth structures (1). The latter can be very different and more diverse than the equilibrium forms (2). Significantly, self-assembly provides a practical strategy for creating ensembles of nanostructures with unique size and shape dependent properties, a central goal of nanotechnology.A broad range of systems self-assemble, spanning hard and soft matter, with a wide variety of interactions and component sizes. We consider the formation of metal nanostructures motivated by applications ranging from catalysis to plasmonics (3-5). Our specific focus is vapor deposition of metal atoms on single-crystal metal surfaces under the well controlled conditions of ultrahigh vacuum (UHV). This process leads to the self-assembly of metal nanostructures and growth of epitaxial metal films. Here, the nonaggregated components are rapidly diffusing adsorbed atoms (adatoms) which assemble into islands. Relaxation in the aggregated state can be achieved via diffusion of adatoms along island edges or via detachment-reattachment. Understanding these processes on the atomic scale facilitates guided formation of functional nanostructures with tailored morphologies and (for alloys) compositions. Ideally, control over formation allows tuning of desired properties, e.g., for heterogeneous catalysis (6).Despite the complexity of self-assembly processes, significant advances are being made in the development of predictive models even in soft material systems (7). Our focus on epitaxial growth on perfect single-crystal surfaces (hard materials) under UHV has a special advantage in facilitating extremely detailed and realistic atomistic-level modeling. Localization of adatoms to a periodic array of adsorption sites enables the use of lattice-gas (LG) models for which nonequilibrium evolution can be efficiently analyzed on the appropriate time-and length-scales via kinetic Monte Carlo (KMC)...

show abstract

Section: Au On Nial(110) and Comparison With Ag On Nial(110)mentioning

confidence: 99%

“…Understanding these processes on the atomic scale facilitates guided formation of functional nanostructures with tailored morphologies and (for alloys) compositions. Ideally, control over formation allows tuning of desired properties, e.g., for heterogeneous catalysis (6).…”

mentioning

confidence: 99%

Self-assembly of metal nanostructures on binary alloy surfaces

Duguet

Han²,

Yuen

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

show abstract

“…Troop movements, the details of a secret sauce formula, and news of a possible merger with another company all require confidentiality. Confidentiality is defined by Bishop [14] as not allowing unauthorized users to access information or objects. For the purpose of this framework, confidentiality is keeping information about the supply chain (e.g.…”

Section: Confidentialitymentioning

confidence: 99%

What do you mean, Supply Chain Security? A Taxonomy and Framework for Knowledge Sharing

Smith¹,

Teuton²

2017

Proceedings of the 50th Hawaii International Conference on System Sciences (2017)

View full text Add to dashboard Cite

show abstract

“…Also, there were evidences that peroxide species have the highest activity. Some other researchers believed that the molecularly adsorbed oxygen, instead of the atomic ones, were the active species [51].…”

Section: Characterization: the Challengementioning

confidence: 99%

“…Apparently, these questions are associated with each other. At present, several interpretations of the activities of the supported Au catalysts include: (1) the defects of the support surface, (2) cation Au atoms or clusters on the support surface, (3) unsaturated-coordinating Au atoms, (4) neutral atoms on Au NPs, (5) the strain in the Au NPs, and (6) metal-nonmetal transitions of Au NPs [5,21,46,[48][49][50][51][52][53][54].…”

Section: Introductionmentioning

confidence: 99%

The electronic structure and geometric structure of nanoclusters as catalytic active sites

2013

Nanotechnology Reviews

View full text Add to dashboard Cite

Abstract:In the past few decades, metal nanoparticles applied in heterogeneous catalysis have attracted extensive attention. The term nanocatalysis is broadly referred to as the unique catalytic effect of this series of materials. Although considerable progress has been made in nanocatalysis, it still remains a great challenge to fully understand the nature of active sites in the nanoscale. Many concepts and models have been put forwarded to describe the properties and performances of nano-and subnanoparticles in catalysis. In this review, we propose our perspective on the active sites of heterogeneous catalysis from the aspects of electronic structure and geometric structure of nanoclusters and consider briefly how these clusters function in catalysis. The challenge in nanocatalysis research methods is also discussed.

show abstract

Catalytically Active Gold: From Nanoparticles to Ultrathin Films

Cited by 62 publications

References 75 publications

Self-assembly of metal nanostructures on binary alloy surfaces

Self-assembly of metal nanostructures on binary alloy surfaces

What do you mean, Supply Chain Security? A Taxonomy and Framework for Knowledge Sharing

The electronic structure and geometric structure of nanoclusters as catalytic active sites

Contact Info

Product

Resources

About