Self-ordered electrochemical growth on single-crystal electrode surfaces

Allongue, P.; Maroun, Fouad

doi:10.1088/0953-8984/18/13/s07

Cited by 22 publications

(14 citation statements)

References 63 publications

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“…10 Figure 9a shows an atomic force micrscopy image of the sample after gold deposition. All the fl at top Au islands are (111) oriented and are in epitaxy with Si(111).…”

Section: Self-organized Nanostructuresmentioning

confidence: 99%

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Electrodeposited magnetic layers in the ultrathin limit

Allongue¹,

Maroun²

2010

MRS Bull.

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Magnetism is highly sensitive to the local atomic environment, a property that is at the origin of the unique magnetic behavior induced by the large ratio of surface or interface atoms to bulk atoms in nanostructures and ultrathin fi lms. One key property of strong relevance in technology is interface-induced perpendicular magnetization anisotropy, which often is observed in ultrathin magnetic layers of only a few atomic planes. Establishing the existence of this phenomenon required an improved control of the growth modes, and advances in its understanding required detailed structural studies coupled with sensitive magnetic characterization. While magnetic nanostructures have been mainly realized using molecular beam epitaxy, the preparation of magnetic nanostructures in the electrolytic environment has become possible, with a degree of control that is comparable to that achieved in ultrahigh vacuum. This article reviews recent studies about epitaxial ultrathin magnetic layers electrodeposited on Au(111) single crystal electrodes with emphasis on in situ structural and magnetic characterization. This article also demonstrates that surface magnetism is very sensitive to the electrochemical interface.

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“…10 Figure 9a shows an atomic force micrscopy image of the sample after gold deposition. All the fl at top Au islands are (111) oriented and are in epitaxy with Si(111).…”

Section: Self-organized Nanostructuresmentioning

confidence: 99%

“…9 More recent studies focused on the formation of nanostructures 10,11 and aimed, for instance, at tailoring the electrocatalytic activity of Pd monolayers by depositing them on different substrates to vary the lattice parameter. 12 A few works dealt with magnetic materials in the ultrathin limit (0-2 nm thick).…”

Section: Introductionmentioning

confidence: 99%

Electrodeposited magnetic layers in the ultrathin limit

Allongue¹,

Maroun²

2010

MRS Bull.

Self Cite

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“…7,8 Chemical and electrochemical deposition, in turn, tend to produce statistically varying particle diameters and geometries. 9,10 For many applications, the deposition of plasmonic particles onto semiconductor supports is desired. In solid state photovoltaics, nanoparticles are employed for improved light incoupling into the absorber and for an overall efficiency increase of solar cells.…”

Section: Introductionmentioning

confidence: 99%

“…Noble metal nanoparticles are of increased interest in a wide range of research fields ranging from medical application , to photovoltaics , and photoelectrocatalysis. , Fabrication principles, comprising chemical synthesis of colloidal particles, typically result in high monodispersity of size and shape. , Chemical and electrochemical deposition, in turn, tend to produce statistically varying particle diameters and geometries. , For many applications, the deposition of plasmonic particles onto semiconductor supports is desired. In solid state photovoltaics, nanoparticles are employed for improved light incoupling into the absorber and for an overall efficiency increase of solar cells.…”

Section: Introductionmentioning

confidence: 99%

Brewster-Angle Variable Polarization Spectroscopy of Colloidal Au-Nanospheres and -Nanorods at the Silicon Surface

Lublow¹,

Lü²,

2012

J. Phys. Chem. C

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Colloidal Au-nanospheres and -nanorods were chemically synthesized from chloroauric acid containing solutions and adsorbed to hydrogen-terminated p-Si(111) surfaces. A comparative analysis of the respective plasmon resonance modes, in solution and at the silicon surface, was carried out by in situ optical transmission and surface reflection techniques. In solution, the absorbance was determined by VIS transmission spectroscopy and compared to Mie theory as well as finite difference time domain calculations. At the p-Si(111) surface, the reflectance was analyzed for the first time by Brewster-angle variable polarization spectroscopy (BA-VPS) and discussed in terms of anisotropic uniaxial thin-film properties. With BA-VPS, the strengths of parallel and orthogonal electric field components of the incident wave can be varied relative to the surface plane. Consequently, opposite changes of transverse and longitudinal resonance strengths are detected upon gradually incremented light polarization angles. Model considerations confirm that spherical and elongated particles can thereby be distinguished. The influence of particle–surface interaction and the dielectric environment is finally discussed.

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“…Fe is a typical magnetic element with special chemical properties. Its diverse applications in magnetic recording, chemical catalysis, and biomedical diagnoses have stimulated extensive investigations in the synthesis of Fe nanocrystals with tunable size and shape , and growth of Fe thin films via solution chemistry and by electrodeposition and vacuum deposition. − Electrodeposition benefits facile control of potential as well as variation of electrolyte composition including solvents and metal precursors. − So far, electrodeposition of ordered structures of Fe thin films has been mostly carried out in aqueous solutions using Au as substrates, and the main feature observed is the fcc to bcc phase transition as a result of strain release, , similar to that in UHV deposition. , One of the problems associated with electrodeposition of Fe in aqueous solutions is the hydrogen evolution reaction, which reduces the current efficiency and imposes severe H 2 bubble interference that could possibly alter the growth behavior. In this paper, we employ inert ionic liquid as solvent to show a paradigm change of nucleation/growth of Fe by electrodeposition.…”

Section: Introductionmentioning

confidence: 99%

Growth and Shape-Ordering of Iron Nanostructures on Au Single Crystalline Electrodes in an Ionic Liquid: A Paradigm of Magnetostatic Coupling

Wei

Yan

et al. 2010

J. Am. Chem. Soc.

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Fe electrodeposition on Au(111) and Au(100) in BMIBF(4) ionic liquid is found to form hitherto unreported shape-ordered nanoscale morphologies of pseudorods and pseudosquare rings, respectively, both composed of grains of 4-7 nm. The manner of growth of the square rings is a ring-on-ring structure with enlarging side length and slightly protruding four corners. The generality of the growth mechanism is verified by the formation of almost exactly the same shape-ordered Fe nanostructures on Pt, i.e., pseudorod structure on Pt(111) and pseudosquare rings Pt(100). These structures are explained within the framework of magnetostatic interactions of spontaneously magnetized grains under crystallographic constraint of the substrate surface, which result in an antiparallel arrangement in magnetization of the grains at pseudorods and magnetic flux closure at the pseudosquare rings. The closed magnetic flux further leads to magnetic field-enhanced growth at the four corners and the outer peripheries of the pseudosquare rings. The observed shape-ordering of the Fe thin film serves as a paradigm of magnetostatic coupling, in which the roles of ionic liquid as surfactant and magnetic media may not be underestimated. The present work adds a new dimension to electrodeposition in ionic liquid, by which new magnetic film structures may be expected.

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Self-ordered electrochemical growth on single-crystal electrode surfaces

Cited by 22 publications

References 63 publications

Electrodeposited magnetic layers in the ultrathin limit

Electrodeposited magnetic layers in the ultrathin limit

Brewster-Angle Variable Polarization Spectroscopy of Colloidal Au-Nanospheres and -Nanorods at the Silicon Surface

Growth and Shape-Ordering of Iron Nanostructures on Au Single Crystalline Electrodes in an Ionic Liquid: A Paradigm of Magnetostatic Coupling

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