Publications by Giovanni Costantini

Programming Hierarchical Supramolecular Nanostructures by Molecular Design

Klaus Kern, Magalí Alejandra Lingenfelder, Giovanni Costantini

Supramolecular nanostructures with tunable dimensionalities are fabricated by deposition of benzene carboxylic acids on the Cu(110) surface. By tailoring the number and position of the functional moieties, the structure of the final molecular assemblies ca ...

Amer Chemical Soc2013

Surface morphology of MnSi thin films grown on Si(111)

Klaus Kern, Theresa Lutz, Giovanni Costantini

The surface morphology of MnSi thin films grown on Si(111)-7 x 7 substrates was investigated by systematically changing the amount of deposited Mn. A new 3 x 3 surface reconstruction was found at the very initial growth stages, whose atomic configuration w ...

Elsevier Science Bv2013

Varying molecular interactions by coverage in supramolecular surface chemistry

Klaus Kern, Magalí Alejandra Lingenfelder, Giovanni Costantini

The possibility of modifying the intermolecular interactions of absorbed benzene-carboxylic acids from coordination to hydrogen bonding by changing their surface coverage is demonstrated through a combination of scanning tunnelling microscopy, X-ray photo- ...

Royal Society of Chemistry2012

Growth mode and atomic structure of MnSi thin films on Si(111)

Klaus Kern, Theresa Lutz, Giovanni Costantini

Thin films of MnSi(111) in B20 structure formed by reactive epitaxy on Si(111) are studied using scanning tunneling microscopy (STM) and density functional theory calculations. Coexisting root 3 x root 3 structures with high or low corrugation are observed ...

Amer Physical Soc2012

Crystalline Inverted Membranes Grown on Surfaces by Electrospray Ion Beam Deposition in Vacuum

Klaus Kern, Stephan Rauschenbach, Ralf Thomas Weitz, Theresa Lutz, Nicha Thontasen, Gordon Rinke, Giovanni Costantini

Wiley2012

Terephthalic acid adsorption on Si(111)-(root 3x root 3)-Bi surfaces: Effect of Bi coverage

Klaus Kern, Theresa Lutz, Giovanni Costantini

The influence of the density of metallic atoms on the formation of supramolecular structures onto Si surface alloys is investigated by scanning tunneling microscopy. Terephthalic acid (TPA) adsorption experiments are performed on the Si(111) alpha- and bet ...

2011

Tertiary Chiral Domains Assembled by Achiral Metal-Organic Complexes on Cu(110)

Klaus Kern, Giovanni Costantini

We report on the formation of chiral domains self-assembled from terephthalic acid (TPA) and iron on a Cu(110) surface. Using scanning tunnelling microscopy, we observe that the supramolecular structures are organized on successive hierarchical levels. Chi ...

2010

Reversing the shape transition of InAs/GaAs (001) quantum dots by etching-induced lateral In segregation

Klaus Kern, Theresa Lutz, Giovanni Costantini

The shape evolution of epitaxially grown InAs/GaAs(001) quantum dots after the controlled removal of material by an in situ etching gas is investigated by atomic force and scanning tunneling microscopy. The presence of {137} facets on the surface of partia ...

2010

Substrate effect on supramolecular self-assembly: from semiconductors to metals

Klaus Kern, Dietmar Payer, Theresa Lutz, Giovanni Costantini

Terephthalic acid (TPA) deposited on Si(111)-7 x 7, Si(111)-root 3 x root 3-Ag and Ag(111) has been studied as a model system to understand how much passivated semiconductor surfaces differ from semiconductor and metal surfaces in respect of supramolecular ...

2009

Electrospray Ion Beam Deposition: Soft-Landing and Fragmentation of Functional Molecules at Solid Surfaces

Klaus Kern, Stephan Rauschenbach, Nicha Thontasen, Giovanni Costantini

The ion, beam deposition (IBD) of rhodamine dye molecules on solid surfaces in high vacuum is explored in order to characterize the possibility of fabricating molecular coatings or nanostructures from nonvolatile molecules. Molecular ion beams with a well- ...

2009

Metal-organic coordination interactions in Fe-Terephthalic acid networks on Cu(100)

Klaus Kern, Giovanni Costantini

Metal-organic coordination interactions are prime candidates for the formation of self-assembled, nanometer-scale periodic networks with room-temperature structural stability. We present X-ray photoelectron spectroscopy measurements of such networks at the ...

2008

Positioning of strained islands by interaction with surface nanogrooves

Klaus Kern, Giovanni Costantini

When strained Stranski-Krastanow islands are used as "self-assembled quantum dots," a key goal is to control the island position. Here we show that nanoscale grooves can control the nucleation of epitaxial Ge islands on Si(001), and can drive lateral motio ...

2008

Hydrogen and coordination bonding supramolecular structures of trimesic acid on Cu(110)

Klaus Kern, Magalí Alejandra Lingenfelder, Giovanni Costantini

The adsorption of trimesic acid (TMA) on Cu(110) has been studied in the temperature range between 130 and 550 K and for coverages up to one monolayer. We combine scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), reflection absor ...

2007

Ordering of dipeptide chains on Cu surfaces through 2D cocrystallization

Klaus Kern, Magalí Alejandra Lingenfelder, Giovanni Costantini

We report on the induced ordering of dispersed chiral diphenylalanine (Phe-Phe) chains grown on the anisotropic Cu(110) and isotropic Cu(100) surfaces. Scanning tunneling microscopy (STM) data reveal that 2D extended hybrid molecular motifs can be fabricat ...

2007

Structure and energetics of diphenylalanine self-assembling on Cu(110)

Klaus Kern, Magalí Alejandra Lingenfelder, Giovanni Costantini

We investigate the dynamical features of the adsorption of diphenylalanine molecules on the Cu(I 10) surface and of their assembling into supramolecular structures by a combination of quantum and classical atomistic modeling with dynamic scanning tunneling ...

2007