Direct imaging of quantum antidots in MgO dispersed with Au nanoclusters

Wang, C. M.; Shutthanandan, V.; Thevuthasan, S.; Duscher, Gerd

doi:10.1063/1.2099518

Cited by 11 publications

(9 citation statements)

References 22 publications

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“…This is indeed the case in figure 5, where a relationship of Au(001) MgO(001) is established, as indicated in figure 5(c). This is consistent with the findings by Wang et al [22] in their TEM investigation of implanted Au nanoparticles inside MgO substrates, in which the same epitaxial interface was inferred based on the cubic faceting of the generated vacancy clusters (i.e. antidots).…”

supporting

confidence: 92%

“…Such a shift has been proposed to stem 3 Author to whom any correspondence should be addressed. from the existence of quantum antidots at the surface of Au nanoparticles, and associated electron transfer from Au nanoparticles to the quantum antidots [22,23]. In these studies, the Au nanoparticles were implanted into a MgO film; it is expected that on a nanoscale, the nonlinear optical properties of MgO nanowires should be also influenced by the existence of Au nanoparticles.…”

mentioning

confidence: 99%

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The morphology of Au@MgO nanopeapods

Zhou¹,

Sun²,

Yu³

et al. 2009

Nanotechnology

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The structure of metal nanoparticles embedded inside dielectric nanowires/nanotubes, namely nanopeapods, has been of increasing interest due to their unusual photoresponse and optical adsorption properties. This paper presents a type of new inorganic nanopeapod: faceted Au nanoparticles inside MgO nanowires. The Au self-assembles into a nanoparticle chain during the vapor-liquid-solid growth of the MgO nanowires for which gold also serves as the catalyst. Surprisingly such a chain can follow the whole axis of the MgO nanowires even if the latter zigzag, provided that the amount of gold is sufficient. It is shown that such Au@MgO nanopeapods form not only under metalorganic chemical vapor deposition conditions (Lai et al 2009 Appl. Phys. Lett. 94 022904), but also under our conventional vapor transport deposition condition. This new nanopeapod material might be a candidate for the study of electronic and/or plasmonic wave transport along nanowires.

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confidence: 92%

mentioning

confidence: 99%

The morphology of Au@MgO nanopeapods

Zhou¹,

Sun²,

Yu³

et al. 2009

Nanotechnology

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“…Additionally, metallic nanoparticles in a dielectric matrix can act as plasmonic resonators under UV laser illumination, , which may result in local heating around the Au nanoparticles. For ion-implanted Au nanoparticles, there are vacancies within the MgO that could further complicate the ion trajectories during APT analysis; this is a practical concern for catalysts, in which supports are often created porous to increase surface area. These additional factors could readily explain the remaining difference between the simulated and experimentally observed Au nanoparticle composition.…”

mentioning

confidence: 99%

Understanding Atom Probe Tomography of Oxide-Supported Metal Nanoparticles by Correlation with Atomic-Resolution Electron Microscopy and Field Evaporation Simulation

Devaraj

Colby

Vurpillot

et al. 2014

J. Phys. Chem. Lett.

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Oxide-supported metal nanoparticles are widely used in heterogeneous catalysis. The increasingly detailed design of such catalysts necessitates three-dimensional characterization with high spatial resolution and elemental selectivity. Laser-assisted atom probe tomography (APT) is uniquely suited to the task but faces challenges with the evaporation of metal/insulator systems. Correlation of APT with aberration-corrected scanning transmission electron microscopy (STEM), for Au nanoparticles embedded in MgO, reveals preferential evaporation of the MgO and an inaccurate assessment of nanoparticle composition. Finite element field evaporation modeling is used to illustrate the evolution of the evaporation front. Nanoparticle composition is most accurately predicted when the MgO is treated as having a locally variable evaporation field, indicating the importance of considering laser-oxide interactions and the evaporation of various molecular oxide ions. These results demonstrate the viability of APT for analysis of oxide-supported metal nanoparticles, highlighting the need for developing a theoretical framework for the evaporation of heterogeneous materials.

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“…[1][2][3][4] To produce nanoparticles on a substrate, many chemical and physical methods have been applied, such as ion implantation, sol and sol-gel, cosputtering, pulsed laser deposition, cluster beam deposition and flame synthesis. [5][6][7][8][9] Among various methods used to synthesize nanoparticles, ion implantation attracts much attention because of the possibility to overcome the doping solubility limits, to easily control the dopant concentration, to introduce, in general, any element of the periodic table into any host and to prepare very thin films buried in a host material. [10][11][12] As a consequence, ion beam implantation has been widely used for the fabrication of both metallic and semiconductor nanoparticles embedded in various host matrices.…”

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confidence: 99%

Three-Dimensional Modeling of Embedded Nanoparticles Formation by Ion Beam Implantation

Li¹

2013

j comput theor nanosci

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A three-dimensional model was developed to investigate the formation of embedded nanoparticles by ion beam implantation. The dynamical nucleation and growth process, including well-known Ostwald ripening, were successfully reconstructed by a theoretical model. Considering various Gaussian distribution profiles of implanted ions for different conditions, the effects of implanted ion mass, fluence, ion flux and temperature on the morphology of nanostructures were also revealed. According to the numerical calculations, no precipitates or particles formed in the early stage of implantation due to the low ion fluence and insufficient time for ion diffusion. With increasing ion fluence, immiscible impurity atoms started to segregate as dispersed nanoparticles. For a very high ion fluence, the implantation-induced nanostructure with a buried layer of implanted atoms developed. These simulation results were fully consistent with many experimental observations. This theoretical model gives a remarkable insight into the formation mechanism, and makes it possible to totally control and optimize the nanostructure through ion-implantation technology.

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Direct imaging of quantum antidots in MgO dispersed with Au nanoclusters

Abstract: Characterization of metal clusters (Pd and Au) supported on various metal oxide surfaces (MgO and TiO 2 )

Cited by 11 publications

References 22 publications

The morphology of Au@MgO nanopeapods

The morphology of Au@MgO nanopeapods

Understanding Atom Probe Tomography of Oxide-Supported Metal Nanoparticles by Correlation with Atomic-Resolution Electron Microscopy and Field Evaporation Simulation

Three-Dimensional Modeling of Embedded Nanoparticles Formation by Ion Beam Implantation

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