Growth of Co nanolines on self-assembled Si nanostripes

One-dimensional Si nanostructures, grown on a Ag(110) substrate, have been used as a template to grow Co nanolines. Before Co deposition, the self-assembled Si nanostripes were characterized by high-resolution scanning tunneling microscopy. From this, an original atomic arrangement of silicon adatoms forming nanostripes can be proposed. The early stages of the Co deposition at room temperature on the Si nanostripes have then been studied by scanning tunneling microscopy, enabling the localization of adsorbed Co atoms. We show that Co is adsorbed on top of the Si nanostripes forming nanolines. No Co adsorption was detected on the pure Ag-surface in between the stripes. The preparation of an interesting one-dimensional Co-Si nanosystem is demonstrated

Physics Of Silicene Stripes

Silicene, a monolayer of silicon atoms tightly packed into a two-dimensional honeycomb lattice, is the challenging hypothetical reflection in the silicon realm of graphene, a one-atom thick graphite sheet, presently the hottest material in condensed matter physics. If existing, it would also reveal a cornucopia of new physics and potential applications. Here, we reveal the epitaxial growth of silicene stripes self-aligned in a massively parallel array on the anisotropic silver (110) surface. This crucial step in the silicene gold rush could give a new kick to silicon on the electronics road-map and open the most promising route towards wide-ranging applications. A hint of superconductivity in these silicene stripes poses intriguing questions related to the delicate interplay between paired correlated fermions, massless Dirac fermions and bosonic quasiparticles in low dimensions. © 2009 Springer Science+Business Media, LLC

Graphene-Like Silicon Nano-Ribbons On The Silver (110) Surface

Silicene, a monolayer of silicon atoms packed into a two-dimensional honeycomb lattice is the challenging hypothetical reflection in the, silicon realm of graphene, a one-atom thick graphite sheet, presently the hottest new material in condensed matter physics and nanotechnology. If existing, it would also reveal a cornucopia of new physics and potential applications. Here, we reveal the catalytic growth of graphene-like silicon nano-ribbons self-aligned in a massively parallel array on the anisotropic Ag(11O) surface. We compare with one-dimensional (ID) structures formed, more classically, the other way around, upon depositing gold or silver on the silicon (111) surface. Finally, we envisage wide ranging applications for these novel silicene stripes. © 2008 IEEE

Physics And Chemistry Of Silicene Nano-Ribbons

We review our recent discovery of silicene in the form of silicon nano-ribbons epitaxially grown on silver (1 1 0) or (1 0 0) surfaces, which paves the way for the growth of graphene-like sheets. We further draw some perspectives for this unique novel material upon mild hydrogenation. © 2009 Elsevier B.V

Growth and dissolution kinetics of Au/Pb(1 1 1): an AES-LEED study

Abstract The growth of Au on a Pb(1 1 1) surface is studied by AES-LEED at room temperature (RT). After deposition of 1/3 Au monolayer (ML), LEED observations reveal a p( p 3 Â p 3)R308 superstructure. Beyond this coverage, no superstructure is observed. From Au and Pb Auger peak intensities, we deduce that the growth corresponds to the formation of an inter-metallic compound Au x Pb y continuously growing under a floating Pb ML. The dissolution kinetics of one Au ML recorded at various temperatures systematically show a plateau (a slowing down) at a surface concentration corresponding to 1/3 ML. From a quantitative evaluation of the AES data we propose that the p( p 3 Â p 3)R308 superstructure corresponds to a surface alloy with composition AuPb 2 buried under 1 Pb ML. Such a surface alloy has been previously measured after annealing of a Au(Pb) 0.45 at.% solid solution [Surf. Rev. Lett. 4 (1997) 1139], we propose that the slowing down observed during the dissolution kinetics is also the signature of this unexpected segregation behaviour of Au. It could be related to the fact that the surface energy of this inter-metallic compound (AuPb 2 ) is lower than the surface energy of both constitutive elements (Au and Pb).

Growth and dissolution kinetics of Au/Pb(1 1 1): an AES-LEED study

Abstract The growth of Au on a Pb(1 1 1) surface is studied by AES-LEED at room temperature (RT). After deposition of 1/3 Au monolayer (ML), LEED observations reveal a p( p 3 Â p 3)R308 superstructure. Beyond this coverage, no superstructure is observed. From Au and Pb Auger peak intensities, we deduce that the growth corresponds to the formation of an inter-metallic compound Au x Pb y continuously growing under a floating Pb ML. The dissolution kinetics of one Au ML recorded at various temperatures systematically show a plateau (a slowing down) at a surface concentration corresponding to 1/3 ML. From a quantitative evaluation of the AES data we propose that the p( p 3 Â p 3)R308 superstructure corresponds to a surface alloy with composition AuPb 2 buried under 1 Pb ML. Such a surface alloy has been previously measured after annealing of a Au(Pb) 0.45 at.% solid solution [Surf. Rev. Lett. 4 (1997) 1139], we propose that the slowing down observed during the dissolution kinetics is also the signature of this unexpected segregation behaviour of Au. It could be related to the fact that the surface energy of this inter-metallic compound (AuPb 2 ) is lower than the surface energy of both constitutive elements (Au and Pb).