Controlling the Interface Dynamics at Au Nanoparticle–Oxide Interfaces

Kraya, R. A.; Kraya, L. Y.

doi:10.1109/tnano.2011.2160458

Cited by 7 publications

(4 citation statements)

References 25 publications

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“…Cationic Au species, on the other hand, have been shown to have increased stability, a reduced activation barrier, and increased activity for CO oxidation 31 , 35 . Nevertheless, it is accepted that the structure and chemistry of the particle-support interface plays an important role in dictating transfer of charge 11 , 35 – 39 . The ability to provide direct experimental evidence of charge transfer features on the nanometer scale and correlate this with atomic-scale interfacial structure would therefore significantly aid in resolving these ambiguities and enhance our understanding of charge transfer processes, allowing improved catalysts to be designed.…”

Section: Introductionmentioning

confidence: 99%

Measuring and directing charge transfer in heterogenous catalysts

et al. 2022

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Precise control of charge transfer between catalyst nanoparticles and supports presents a unique opportunity to enhance the stability, activity, and selectivity of heterogeneous catalysts. While charge transfer is tunable using the atomic structure and chemistry of the catalyst-support interface, direct experimental evidence is missing for three-dimensional catalyst nanoparticles, primarily due to the lack of a high-resolution method that can probe and correlate both the charge distribution and atomic structure of catalyst/support interfaces in these structures. We demonstrate a robust scanning transmission electron microscopy (STEM) method that simultaneously visualizes the atomic-scale structure and sub-nanometer-scale charge distribution in heterogeneous catalysts using a model Au-catalyst/SrTiO3-support system. Using this method, we further reveal the atomic-scale mechanisms responsible for the highly active perimeter sites and demonstrate that the charge transfer behavior can be readily controlled using post-synthesis treatments. This methodology provides a blueprint for better understanding the role of charge transfer in catalyst stability and performance and facilitates the future development of highly active advanced catalysts.

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Section: Introductionmentioning

confidence: 99%

Measuring and directing charge transfer in heterogenous catalysts

et al. 2022

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“…In order to understand the size effect, Kraya [17] thought that new models must be developed that would take into account the shape of the contact and the material parameters at the nanoscale. Bolesta [19] studied two structural states of the film and two types of the substrate by molecular dynamics simulation.…”

Section: Resultsmentioning

confidence: 99%

“…In this study, the microstructural changes and mechanical properties in the interface region of duplex stainless steel and medium carbon steel couples were determined. Kraya [17] analyzed the behavior of nanoscale metal-semiconductor interface on three substrates of various dopant concentrations. The results show a relationship similar to that of macroscopic contacts, but with additional tunneling current due to contributions from the edges of the interface.…”

Section: Introductionmentioning

confidence: 99%

Mechanical characteristics comparison approach on metal – matching nano-interface based on Cr in electronic packaging

Yang¹,

Liu²,

Li³

et al. 2013

Composite Interfaces

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Interfaces of dissimilar materials in electronic packaging are prone to crack initiations leading to delaminations. The aim of this paper is to perform a mechanical characteristics comparison approach of the interface structures of different metals with metal Cr. The W/Cr interface, Al/Cr interface, and Cu/Cr interface prototypes were deposited on the quartz glass by using RF magnetron sputtering. The Elastic Modulus and the hardness of the interface prototype were tested by using nano indenter, respectively. The test results show that the elastic modulus and the hardness of these interface prototypes are different at the difference maximum depth h max . The elastic modulus and the hardness of each interface show a marked nonlinearity although there is the same metal Cr in these interfaces samples. Such comparison approach is an important measure to find an appropriate nonlinearity for electronic packaging. The investigation implies that there is a potential probability for improving the mechanical properties in the metal-matching interface for some application. IntroductionElectronic packages usually consist of bonded materials with different mechanical properties. The interfaces of dissimilar materials are prone to crack initiations leading to delaminations. All interfaces in the electronic packages could be locations for potential failures.[1-23] There are many special properties of the metal films, such as giant conductance, giant hall effect, giant magnetoresistance effect, visible light emission, and so on. As the metal nanofilms are at nanoscale, the physical properties and the response to the environment of the films will happen and there are influences on the surface effect, volume effect, classical size effect, and quantum size effect,[1-2] so the traditional test method cannot be used to measure the mechanical properties of the interface, such as the elastic modulus, residual stress, fracture strength, fatigue strength, and the interfacial binding force. A number of approaches have been developed to investigate interfacial delamination, structure design, and the film's mechanical property in recent years. For example, Soulairol et al. [4] investigated the interface structure of silicon nanocrystals embedded in an amorphous silica matrix. Molecular dynamics simulation was applied in this study. The atom-atom interactions are described by a combination of well-assessed potentials for bulk silicon and SiO 2 , plus a mixing term to

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“…[4] Other measurements on oxidized surfaces did not show this type of result, and maintained similar transport properties over a large range of sizes. [5][6][7]The implications are that surface structure can readily affect the size dependent behavior.…”

Section: Discussionmentioning

confidence: 99%

The Effects of Structure on the Formation of Schottky Barriers at Nanoparticle-Oxide Interfaces

Kraya

2013

MRS Proc.

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The surface structure of oxide materials may be the limiting factor in controlling switching properties at interfaces. Here we investigate and correlate the surface structure and electronic properties of BaTiO 3 substrates. By using low energy electron diffraction and scanning tunneling microscopy we are able to identify surface reconstructions based on annealing treatments. We then investigate the effect of contact size on the transport properties on oxide surfaces utilizing atomic force microscopy. Our results show the critical importance of controlling surface structure to optimize electronic properties at oxide interfaces.

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Controlling the Interface Dynamics at Au Nanoparticle–Oxide Interfaces

Cited by 7 publications

References 25 publications

Measuring and directing charge transfer in heterogenous catalysts

Measuring and directing charge transfer in heterogenous catalysts

Mechanical characteristics comparison approach on metal – matching nano-interface based on Cr in electronic packaging

The Effects of Structure on the Formation of Schottky Barriers at Nanoparticle-Oxide Interfaces

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