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Marko Burghard

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Related publications (55)

Spatially Resolved Potential Distribution in Carbon Nanotube Cross-Junction Devices

Klaus Kern, Kannan Balasubramanian, Marko Burghard, Eduardo Jian Hua Lee

Crossed-nanotube junctions, the basic constituents of carbon nanotube networks, are investigated by scanning photocurrent microscopy. The location of the predominant electrostatic potential drop, at the electrical contacts or at the junction, is found to b ...

Wiley2009

Noninvasive metal contacts in chemically derived graphene devices

Klaus Kern, Marko Burghard, Eduardo Jian Hua Lee, Ravi Shankar Sundaram

We study the properties of gold contacts on chemically derived graphene devices by scanning photocurrent microscopy and gate-dependent electrical transport measurements. In the as-fabricated devices, negligible potential barriers are found at the gold/grap ...

AIP American Institute of Physics2009

Electrical Conduction Mechanism in Chemically Derived Graphene Monolayers

Klaus Kern, Marko Burghard, Ravi Shankar Sundaram

We have performed a detailed study of the intrinsic electrical conduction process in individual monolayers of chemically reduced graphene oxide down to a temperature of 2 K. The observed conductance can be consistently interpreted in the framework of two-d ...

American Chemical Society (ACS)2009

The Importance of Grain Boundaries for the Time-Dependent Mobility Degradation in Organic Thin-Film Transistors

Klaus Kern, Marko Burghard, Ralf Thomas Weitz, Hagen Klauk

The relationships between organic semiconductor morphology and device stability of organic field-effect transistors (FETs) are very complex and not yet fully understood. Especially For obtaining high-performance, air-stable n-channel FETs, gaining a deep i ...

2009

Carbon-Based Field-Effect Transistors for Nanoelectronics

Klaus Kern, Marko Burghard, Hagen Klauk

In this review, the suitability of the major types of carbon nanostructures as conducting channels of field-effect transistors (FETs) is compared on the basis of the dimensionality and size of their pi-conjugated system. For each of these materials, recent ...

Wiley2009

Surface enhanced Raman scattering of carbon nanotubes decorated by individual fluorescent gold particles

Klaus Kern, Kannan Balasubramanian, Tilman Assmus, Marko Burghard

Confocal optical microscopy was employed to study the effect of surface-enhanced Raman scattering on individual single-walled carbon nanotubes covered with isolated gold particles. The gold particles with diameters between 10 and 120 nm were deposited in l ...

2008

Effect of the electronic structure of carbon nanotubes on the selectivity of electrochemical functionalization

Klaus Kern, Kannan Balasubramanian, Marko Burghard

The functionalization of carbon nanotubes through electrochemical routes is gaining importance due to the high degree of control achievable and the ability to render the tubes with a variety of chemical and biological species. In this article, we report sy ...

2008

Organic n-channel transistors based on core-cyanated perylene carboxylic diimide derivatives

Klaus Kern, Marko Burghard, Ralf Thomas Weitz, Hagen Klauk

Five core-cyanated perylene carboxylic diimides end-functionalized with fluorine-containing linear and cyclic substituents have been synthesized and employed in the fabrication of air-stable n-channel organic thin-film field-effect transistors with carrier ...

2008

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

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

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

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

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

Carbon nanotube transistors - chemical functionalization and device characterization

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

This review presents an overview of the recent progress made in the field of carbon nanotube (CNT)-based field-effect transistors (FETs). Starting from the simplest device architectures, various methods reported for fabricating CNT-FETs are presented. The ...

Wiley2008

Electronic-band-structure mapping of nanotube transistors by scanning photocurrent microscopy

Klaus Kern, Kannan Balasubramanian, Marko Burghard, Eduardo Jian Hua Lee

2007

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