Functional nanostructures from clusters

Pérez, A.; Melinon, P.; Dupuis, V.; Bardotti, L.; Masenelli, Bruno; Tournus, Florent; Prével, B.; Tuaillon-Combes, J.; Bernstein, E.; Tamion, Alexandre; Blanc, Nils; Tainoff, Dimitri; Boisron, Olivier; Guiraud, Germain; Broyer, M.; Pellarin, M.; Fatti, Natalia Del; Vallée, Fabrice; Cottancin, E.; Lermé, J.; Vialle, Jean; Bonnet, Christophe; Maioli, Paolo; Crut, Aurélien; Clavier, Christian; Rousset, J.L.; Morfin, F.

doi:10.1504/ijnt.2010.031733

Cited by 70 publications

(59 citation statements)

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“…The expansion occurs when the mixture flows through a micrometer nozzle separating the nucleation chamber at high pressure from the deposition chamber at low pressure. The advantage of the deposition of clusters with low energy is that they survive on the substrate essentially without fragmentation, and with little deformation [52]. For binary structures, a target pellet is made by the sintering of a mixture of the two elements.…”

Section: Preformed Clusters In the Gas Phasementioning

confidence: 99%

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Engineered inorganic core/shell nanoparticles

et al. 2014

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It has been for a long time recognized that nanoparticles are of great scientific interest as they are effectively a bridge between bulk materials and atomic structures. At first, size effects occurring in single elements have been studied. More recently, progress in chemical and physical synthesis routes permitted the preparation of more complex structures. Such structures take advantages of new adjustable parameters including stoichiometry, chemical ordering, shape and segregation opening new fields with tailored materials for biology, mechanics, optics magnetism, chemistry catalysis, solar cells and microelectronics. Among them, core/shell structures are a particular class of nanoparticles made with an inorganic core and one or several inorganic shell layer(s). In earlier work, the shell was merely used as a protective coating for the core. More recently, it has been shown that it is possible to tune the physical properties in a larger range than that of each material taken separately. The goal of the present review is to discuss the basic properties of the different types of core/shell nanoparticles including a large variety of heterostructures. We restrict ourselves on all inorganic (on inorganic/inorganic) core/shell structures. In the light of recent developments, the applications of inorganic core/shell particles are found in many fields including biology, chemistry, physics and engineering. In addition to a representative overview 2 of the properties, general concepts based on solid state physics are considered for material selection and for identifying criteria linking the core/shell structure and its resulting properties. Chemical and physical routes for the synthesis and specific methods for the study of core/shell nanoparticle are briefly discussed.

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Section: Preformed Clusters In the Gas Phasementioning

confidence: 99%

“…Unfortunately, this method classified as destructive remains little known despite its high selectivity in depth profile and sensitivity [52,67].…”

Section: Low Energy Ion Scatteringmentioning

confidence: 99%

Engineered inorganic core/shell nanoparticles

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“…Because that approach can provide a high level of control and surface homogeneity, it holds considerable promise for nanotechnology, but it is not emphasized here. Aspects of that body of work have been summarized elsewhere [10][11][12]. …”

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Transition metals on the (0 0 0 1) surface of graphite: Fundamental aspects of adsorption, diffusion, and morphology

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Lei

Wang

et al. 2014

Progress in Surface Science

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In this article, we review basic information about the interaction of transition metal atoms with the (0001) surface of graphite, especially fundamental phenomena related to growth. Those phenomena involve adatomsurface bonding, diffusion, morphology of metal clusters, interactions with steps and sputter-induced defects, condensation, and desorption. General traits emerge which have not been summarized previously. Some of these features are rather surprising when compared with metal-on-metal adsorption and growth. Opportunities for future work are pointed out. Chemistry | Materials Science and Engineering | PhysicsComments NOTICE: This is the author's version of a work that was accepted for publication in Progress in Surface Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publications. A definitive version was subsequently published in Progress in Surface Science, 89 (2014), doi: 10.1016/j.progsurf.2014.08.001. AuthorsDavid Victor Appy, Huaping Lei, Cai-Zhuang Wang, Michael C. Tringides, Da-Jiang Liu, James W. Evans, and Patricia A. Thiel This article is available at Iowa State University Digital Repository: http://lib.dr.iastate.edu/chem_pubs/99 1 NOTICE: This is the author's version of a work that was accepted for publication in Progress in Surface Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publications. A definitive version was subsequently published in Progress in Surface Science, 89 (2014) Abstract.In this article, we review basic information about the interaction of transition metal atoms with the (0001) surface of graphite, especially fundamental phenomena related to growth. Those phenomena involve adatom-surface bonding, diffusion, morphology of metal clusters, interactions with steps and sputter-induced defects, condensation, and desorption. General traits emerge which have not been summarized previously. Some of these features are rather surprising when compared with metal-onmetal adsorption and growth. Opportunities for future work are pointed out. 1.Introduction.Graphite is an intriguing support for metals because of its inertness in aggressive environments, as well as its low cost and high abundance. A major application for graphite-supported metals is lithium ion batteries [1,2]. In fact, the demand for these batteries is expanding so quickly that it currently drives the international market in graphite [1]. An important application on the horizon is biofuel conversion, where graphite (or other carbon-based materials) may provide robust supports for catalysts in aqueous media [3].Adsorption of transition metals and noble metals on graphite has been studi...

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“…FeRh NPs are synthesized as follows: a plasma created by the impact of a laser (YAG, ¼ 532 nm, pulse duration ¼ 8 ns) on a FeRh target is thermalized by injection of a continuous flow of helium at low pressure (30 mbar) inducing the cluster growth [22]. Clusters are subsequently cooled down in the supersonic expansion taking place at the exit nozzle of the source, mass-selected by an electrostatic quadrupole, and transferred to an ultrahigh vacuum chamber (base pressure of 5 Â 10 À10 Torr) where they are deposited at low kinetic energy together with carbon atoms onto a carbon buffer.…”

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Low Temperature Ferromagnetism in Chemically Ordered FeRh Nanocrystals

et al. 2013

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In sharp contrast to previous studies on FeRh bulk, thin films, and nanoparticles, we report the persistence of ferromagnetic order down to 3 K for size-selected 3.3 nm diameter nanocrystals embedded into an amorphous carbon matrix. The annealed nanoparticles have a B2 structure with alternating atomic Fe and Rh layers. X-ray magnetic dichroism and superconducting quantum interference device measurements demonstrate ferromagnetic alignment of the Fe and Rh magnetic moments of 3 and 1 B , respectively. The ferromagnetic order is ascribed to the finite-size induced structural relaxation observed in extended x-ray absorption spectroscopy. DOI: 10.1103/PhysRevLett.110.087207 PACS numbers: 75.30.Kz, 75.75.Cd, 81.07.Bc Iron-rhodium alloys exhibit competing ferromagnetic (FM) and antiferromagnetic (AFM) phases with transition temperatures close to ambient for nearly equiatomic composition and body-centered-cubic (bcc) CsCl-like B2 structure. The competition between the two magnetic orders of FeRh holds great potential in spintronics and heat assisted magnetic recording [1,2]. Moreover, the peculiar bulk FeRh magnetic phase diagram enables its use as active material in heat pumps and refrigerators [3][4][5].At ambient conditions, bulk B2 FeRh is a G-type AFM with a total magnetic moment on the iron atoms of 3:3 B and no appreciable moment on the rhodium atoms [6][7][8]. Above the transition temperature of 370 K, the atomic moments of Fe and Rh are ferromagnetically aligned and take on total values of 3.2 and 0:9 B , respectively [6][7][8]. While it has long been known that the bcc unit cell volume expands by % 1% upon transforming to FM order [9], recent experiments suggest that distortions of the bcc structure may occur [10]. Given the itinerant character of the 3d electrons, the coupling between crystallographic and magnetic order in this system is both rich and very delicate as demonstrated by the theoretical challenge to model the system [11], as well as by recent pump-probe experiments focusing on ultrafast magnetization control [12].Finite-size systems of this alloy have received particular attention by their potential to stabilize the FM phase at room temperature and below. Strained thin films [13,14] showed traces of a FM phase down to 300 K, while ab initio calculations predicted FM down to 0 K for a Rh-terminated 9 ML FeRh(001) film [15] and for 8-atom FeRh clusters [16]. Indeed, since nanosized crystals may present significantly different interatomic distances and unit cell distortions with respect to bulk [17,18], a fundamentally modified magnetic phase diagram can be expected for FeRh nanocrystals. However, the first experiments on chemically synthesized FeRh nanoparticles (NPs) failed to evidence low temperature stability of the FM phase. Most notably, they raised important questions, such as partial B2 ordering, elemental segregation, and coalescence upon annealing [19][20][21].In this Letter, we demonstrate the persistence of FM order down to below 3 K in size-selected FeRh nanocrystals with a mean d...

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Functional nanostructures from clusters

Cited by 70 publications

References 99 publications

Engineered inorganic core/shell nanoparticles

Engineered inorganic core/shell nanoparticles

Transition metals on the (0 0 0 1) surface of graphite: Fundamental aspects of adsorption, diffusion, and morphology

Low Temperature Ferromagnetism in Chemically Ordered FeRh Nanocrystals

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