Studies of individual nanometer-sized metallic clusters using scanning tunneling microscopy, field emission, and field ion microscopy

Castro, T.; Yz, Li; Reifenberger, R.; Choi, E.; Park, SeungBin; Andres, R. P.

doi:10.1116/1.576156

Cited by 33 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One example of analyzed unsupported catalysts by APT involves Ag nanoparticles produced by a gas condensation process [127], the terminated gas condensation method. A similar process was used in the past to deposit Au clusters on FIM tips [128][129][130]. This methodology allows the deposition of nanoparticles with a narrow size distribution without co-deposition of carbon-based support materials or surfactant that complicate the APT analysis.…”

Section: Imaging Other Encapsulated Nanomaterialsmentioning

confidence: 99%

Atom Probe Tomography for Catalysis Applications: A Review

2019

View full text Add to dashboard Cite

Atom probe tomography is a well-established analytical instrument for imaging the 3D structure and composition of materials with high mass resolution, sub-nanometer spatial resolution and ppm elemental sensitivity. Thanks to recent hardware developments in Atom Probe Tomography (APT), combined with progress on site-specific focused ion beam (FIB)-based sample preparation methods and improved data treatment software, complex materials can now be routinely investigated. From model samples to complex, usable porous structures, there is currently a growing interest in the analysis of catalytic materials. APT is able to probe the end state of atomic-scale processes, providing information needed to improve the synthesis of catalysts and to unravel structure/composition/reactivity relationships. This review focuses on the study of catalytic materials with increasing complexity (tip-sample, unsupported and supported nanoparticles, powders, self-supported catalysts and zeolites), as well as sample preparation methods developed to obtain suitable specimens for APT experiments.

show abstract

Section: Imaging Other Encapsulated Nanomaterialsmentioning

confidence: 99%

Atom Probe Tomography for Catalysis Applications: A Review

2019

View full text Add to dashboard Cite

show abstract

“…Finally, three more applications are relevant for catalysis studies: the interaction of cyclohexane on Au tips [237], which finds its interest in the abatement of Volatile Organic Compounds (VOC); the behaviour of potassium-gold films [227], which could be used to study the influence of promoter in a catalytic reaction; and eventually, the imaging of Au nanoparticles by FIM after deposition on a field emitter tip [238,239], opening a way to study the catalytic process on a single Au nanoparticle rather than on a tip-model.…”

Section: Perspectivesmentioning

confidence: 99%

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

et al. 2017

View full text Add to dashboard Cite

Abstract:Since the early discovery of the catalytic activity of gold at low temperature, there has been a growing interest in Au and Au-based catalysis for a new class of applications. The complexity of the catalysts currently used ranges from single crystal to 3D structured materials. To improve the efficiency of such catalysts, a better understanding of the catalytic process is required, from both the kinetic and material viewpoints. The understanding of such processes can be achieved using environmental imaging techniques allowing the observation of catalytic processes under reaction conditions, so as to study the systems in conditions as close as possible to industrial conditions. This review focuses on the description of catalytic processes occurring on Au-based catalysts with selected in situ imaging techniques, i.e., PEEM/LEEM, FIM/FEM and E-TEM, allowing a wide range of pressure and material complexity to be covered. These techniques, among others, are applied to unravel the presence of spatiotemporal behaviours, study mass transport and phase separation, determine activation energies of elementary steps, observe the morphological changes of supported nanoparticles, and finally correlate the surface composition with the catalytic reactivity.

show abstract

“…Thermal stability of metal clusters has become an interesting and essential topic. Extensive studies have been performed both theoretically and experimentally . A dependence of melting temperature on cluster size has been suggested by both computational simulations and experimental findings.…”

Section: Introductionmentioning

confidence: 99%

Melting of icosahedral nickel clusters under hydrostatic pressure

Chen

Wang

et al. 2014

J Comput Chem

View full text Add to dashboard Cite

The thermal stabilities and melting behavior of icosahedral nickel clusters under hydrostatic pressure have been studied by constant-pressure molecular dynamics simulation. The potential energy and Lindemann index are calculated. The overall melting temperature exhibits a strong dependence on pressure. The Lindemann index of solid structure before melting varies slowly and is almost independent of pressure. However, after the clusters melt completely, the Lindemann index at the overall melting point strongly depends on pressure. The overall melting temperature is found to be increasing nonlinearly with increasing pressure, while the volume change during melting decreases linearly with increasing pressure. Under a high pressure and temperature environment, similar angular distributions were found between liquid and solid structures, indicating the existence of a converging local structure.

show abstract

Studies of individual nanometer-sized metallic clusters using scanning tunneling microscopy, field emission, and field ion microscopy

Cited by 33 publications

References 0 publications

Atom Probe Tomography for Catalysis Applications: A Review

Atom Probe Tomography for Catalysis Applications: A Review

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

Melting of icosahedral nickel clusters under hydrostatic pressure

Contact Info

Product

Resources

About