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Klaus Kern

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Publications associées (299)

Electrospinning of diphenylalanine nanotubes

Klaus Kern, Alexander Bittner, Sebastian Loscher

Electrospinning from concentrated diphenylalanine solutions in a low-boiling-point solvent results in tubes that are chemically identical to self-assembled tubes, but show different morphologies, especially extreme lengths. Electrospinning of tubes offers ...

Wiley2008

Contact and edge effects in graphene devices

Klaus Kern, Kannan Balasubramanian, Marko Burghard, Ralf Thomas Weitz, Eduardo Jian Hua Lee

Electrical transport studies on graphene have been focused mainly on the linear dispersion region around the Fermi level(1,2) and, in particular, on the effects associated with the quasiparticles in graphene behaving as relativistic particles known as Dira ...

2008

Chiral kagome lattice from simple ditopic molecular bricks

Harald Brune, Klaus Kern, Régis Decker, Uta Schlickum

Self-assembly techniques allow for the fabrication of highly organized architectures with atomic-level precision. Here, we report on molecular-level scanning tunneling microscopy observations demonstrating the supramolecular engineering of complex, regular ...

American Chemical Society2008

Electrochemical modification of graphene

Klaus Kern, Kannan Balasubramanian, Marko Burghard, Ravi Shankar Sundaram

Nanoparticles on an atomic carpet: Individual graphene sheets have been decorated with metal nanoparticles through electrochemistry. The attachment of Pd particles onto graphene renders it sensitive to hydrogen. The controlled functionalization of graphene ...

Wiley2008

Viruses as scaffolds for tubes and wires

Klaus Kern, Alexander Bittner

2008

Ordering and Stabilization of Metal-Organic Coordination Chains by Hierarchical Assembly through Hydrogen Bonding at a Surface

Klaus Kern, Alexander Langner

Wiley-VCH Verlag GmbH2008

Experimental and theoretical investigations of the thermodynamic stability of Ba-C-60 and K-C-60 compound clusters

Klaus Kern

A novel experimental set-up was used to study superstable (magic) Ba-C-60 and K-C-60 compound clusters. The most stable systems observed cannot be rationalized by simple electronic or by geometrical shell filling arguments. Annealing the clusters past the ...

2008

Spatial modulation of the Dirac gap in epitaxial graphene

Klaus Kern

We use scanning tunneling spectroscopy (STS) at low temperatures to investigate the local electronic structure of mono- and bilayer graphene grown epitaxially on SiC(0001). Already for monolayer graphene, a gap opening is observed in the pi-bands at the Di ...

2008

Electronic decoupling and templating of Co nanocluster arrays on the boron nitride nanomesh

Klaus Kern, Violetta Sessi, Jian Zhang

Positioning nanostructures and functional molecules at surfaces and engineering their local coupling behavior is a key challenge in nanotechnology. The recently discovered BN nanomesh on the Rh(111) surface is a potential candidate to combine both properti ...

2008

Background removal in scanning tunneling spectroscopy of single atoms and molecules on metal surfaces

Klaus Kern, Peter Wahl

Scanning tunneling spectroscopy has developed into a powerful spectroscopic technique that has found wide application in the atomic scale characterization of the electronic properties of clean surfaces as well as adsorbates and defects at surfaces. However ...

2008

Electronic Structure of Surface-supported Bis(phthalocyaninato) terbium(III) Single Molecular Magnets

Klaus Kern

The electronic structure of isolated bis(phthalocyaninato) terbium(ill) molecules, a novel single-molecular-magnet (SMM), supported on the Cu(111) surface has been characterized by density functional theory and scanning tunneling spectroscopy. These studie ...

American Chemical Society (ACS)2008

Design criteria for scanning tunneling microscopes to reduce the response to external mechanical disturbances

Klaus Kern, Maximilian Assig

We present a simple one-dimensional model to find design criteria for a scanning tunneling microscope (STM) minimizing the response of the tip-sample distance to external mechanical disturbances. The underlying concept-achieving a response that is in phase ...

2008

Plasmonic nanostructures in aperture-less scanning near-field optical microscopy (aSNOM)

Klaus Kern, Alexandre Dmitriev, Ralf Thomas Weitz

Apertureless scanning near-field optical microscopy offers superb spatial resolution, but interpreting the recoreded signal can still be a challenge. Especially images of eigenmodes in plasmonic nanostructures are very often obscured by concurrent scatteri ...

2008

Strong p-Type Doping of Individual Carbon Nanotubes by Prussian Blue Functionalization

Klaus Kern, Marko Burghard, Ralf Thomas Weitz, Eduardo Jian Hua Lee, Adarsh Singh Sagar

2008

Quasiparticle Chirality in Epitaxial Graphene Probed at the Nanometer Scale

Klaus Kern

Graphene exhibits unconventional two-dimensional electronic properties resulting from the symmetry of its quasiparticles, which leads to the concepts of pseudospin and electronic chirality. Here, we report that scanning tunneling microscopy can be used to ...

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

Polymer nanofibers via nozzle-free centrifugal spinning

Klaus Kern, Stephan Rauschenbach, Marko Burghard, Ralf Thomas Weitz

We report on the unexpected finding of nanoscale fibers with a diameter down to 25 nm that emerge from a polymer solution during a standard spin-coating process. The fiber formation relies upon the Raleigh-Taylor instability of the spin-coated liquid film ...

American Chemical Society (ACS)2008

Assembling Isostructural Metal-Organic Coordination Architectures on Cu(100), Ag(100) and Ag(111) Substrates

Klaus Kern, Alexander Langner

2008

Elastic properties of chemically derived single graphene sheets

Klaus Kern, Marko Burghard

The elastic modulus of freely suspended graphene monolayers, obtained via chemical reduction of graphene oxide, was determined through tip-induced deformation experiments. Despite their defect content, the single sheets exhibit an extraordinary stiffness ( ...

American Chemical Society (ACS)2008

Direct Near-Field Optical Imaging of Higher Order Plasmonic Resonances

Klaus Kern, Alexandre Dmitriev

We map in real space and by purely optical means near-field optical information of localized surface plasmon polariton (LSPP) resonances excited in nanoscopic particles. We demonstrate that careful polarization control enables apertureless scanning near-fi ...

American Chemical Society (ACS)2008

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