Bimetallic nanoparticles—novel materials for chemical and physical applications

Toshima, Naoki; Yonezawa, Tetsu

doi:10.1039/a805753b

Cited by 1,598 publications

(1,199 citation statements)

References 84 publications

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“…38 Thus, EXAFS is one of the most powerful characterization methods for obtaining the detailed structure of nanoparticles. 39 For example, it is from EXAFS data that the core-shell structures of Pt-Pd 40 and Pt-Ru 41 nanoparticles were deduced.…”

Section: Monte Carlo Simulations On Pt-mo Nanoparticlesmentioning

confidence: 99%

Surface Structures of Cubo-Octahedral Pt−Mo Catalyst Nanoparticles from Monte Carlo Simulations

et al. 2005

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-The surface structures of cubo-octahedral Pt-Mo nanoparticles have been investigated using the Monte Carlo method and modified embedded atom method potentials that we developed for Pt-Mo alloys. The cubo-octahedral Pt-Mo nanoparticles are constructed with disordered fcc configurations, with sizes from 2.5 to 5.0 nm, and with Pt concentrations from 60 to 90 at. %. The equilibrium Pt-Mo nanoparticle configurations were generated through Monte Carlo simulations allowing both atomic displacements and element exchanges at 600 K. We predict that the Pt atoms weakly segregate to the surfaces of such nanoparticles. The Pt concentrations in the surface are calculated to be 5 to 14 at. % higher than the Pt concentrations of the nanoparticles. Moreover, the Pt atoms preferentially segregate to the facet sites of the surface, while the Pt and Mo atoms tend to alternate along the edges and vertices of these nanoparticles. We found that decreasing the size or increasing the Pt concentration leads to higher Pt concentrations but fewer Pt-Mo pairs in the Pt-Mo nanoparticle surfaces.

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Section: Monte Carlo Simulations On Pt-mo Nanoparticlesmentioning

confidence: 99%

Surface Structures of Cubo-Octahedral Pt−Mo Catalyst Nanoparticles from Monte Carlo Simulations

et al. 2005

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“…These surfaces may contain metal nanoparticles for catalytic purposes (Figure 1b). Nanoparticles are fabricated by lithography techniques or synthesized in colloidal solutions ( Figure 1c) [11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

Molecular surface chemistry by metal single crystals and nanoparticles from vacuum to high pressure

2008

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Model systems for studying molecular surface chemistry have evolved from single crystal surfaces at low pressure to colloidal nanoparticles at high pressure. Low pressure surface structure studies of platinum single crystals using molecular beam surface scattering and low energy electron diffraction techniques probe the unique activity of defects, steps and kinks at the surface for dissociation reactions (H-H, C-H, C-C, O=O bonds). High-pressure investigations of platinum single crystals using sum frequency generation vibrational spectroscopy have revealed the presence and the nature of reaction intermediates. High pressure scanning tunneling microscopy of platinum single crystal surfaces showed adsorbate mobility during a catalytic reaction. Nanoparticle systems are used to determine the role of metal-oxide interfaces, site blocking and the role of surface structures in reactive surface chemistry. The size, shape and composition of nanoparticles play important roles in determining reaction activity and selectivity.

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“…Com base no princípio de design estrutural, as nanoligas foram construídas com base nas estruturas icosaédricas (ICO) e cuboctaédricas (CUB) provenientes de nanoclusters de MT 55 . Os autores mostraram que a formação de nanoligas de Pt n Co 55 -n e de Pt n Rh 55 -n é energeticamente favorável para todas as composições estudadas, isto é, n = 6, 13,20,28,35,42,49. Além disso, eles mostraram também que, para as composições Pt 42 Co 13 e Pt 42 Rh 13 , a configuração ICO core-shell com átomos de Pt na região da superfície é a estrutura mais estável entre as investigadas.…”

Section: Dizunclassified

Investigação ab initio dos mecanismos de formação de nanoligas core-shell com platina e metais de transição dos períodos 3d, 4d e 5d

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Bimetallic nanoparticles—novel materials for chemical and physical applications

Cited by 1,598 publications

References 84 publications

Surface Structures of Cubo-Octahedral Pt−Mo Catalyst Nanoparticles from Monte Carlo Simulations

Surface Structures of Cubo-Octahedral Pt−Mo Catalyst Nanoparticles from Monte Carlo Simulations

Molecular surface chemistry by metal single crystals and nanoparticles from vacuum to high pressure

Investigação <i>ab initio</i> dos mecanismos de formação de nanoligas <i>core-shell</i> com platina e metais de transição dos períodos 3<i>d</i>, 4<i>d</i> e 5<i>d</i>

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