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Identification of vibrational signatures from short chains of interlinked molecule-nanoparticle junctions obtained by inelastic electron tunnelling spectroscopy
S.H.M. Jafri, H. Löfås, J. Fransson, T. Blom, A. Grigoriev, A. Wallner, R. Ahuja, H. Ottosson and K. Leifer
Accepted in Nanoscale, 2013.

A New Class of Molecular Conductance Switches Based on the [1,3]-Silyl Migration from Silanes to Silenes
Henrik Löfås, Andreas Orthaber, Burkhard Otto Jahn, Alvi M. Rouf, Anton Grigoriev, Sascha Ott, Rajeev Ahuja and Henrik Ottosson
The Journal of Physical Chemistry C, 2013 

Organic Single Molecular Structures for Light Induced Spin-Pump Devices
Burkhard O. Jahn, Henrik Ottosson, Michael Galperin and Jonas Fransson
ACS Nano, 2013, 7 (2), pp 1064–1071

Double-functionalized nanopore-embedded gold electrodes for rapid DNA sequencing
B. Pathak, H. Löfås, J. Prasongkit, A. Grigoriev, R. H, Scheicher and R. Ahuja
Applied Physics Letters 100, 0237012012.


nanoparticle bridge platform for molecular electronics

  • we make:
    • a metal-molecule-metal junction based on the high-resistance electrode gaps
    • molecule-coated Au nanoparticles
    • advanced surface treatment and nanostructuring methods
    • tailor designed molecules
  • we study:
    • electron transfer through donor-bridge-acceptor type molecules using time-resolved spectroscopy
    • novel anchor groups for metal-molecule-metal junctions by exploiting techniques for surface characterization
    • theory and modeling of electronic structure as well as charge and spin transport 

nanopore DNA sequencing

  • In the proposed sensor DNA strand is driven between two electrodes guided by the nanopore, and the distinction between nucleotides (four DNA bases) is made on the bases of the electric current measurement.
  • we study:
    • enhancing sensitivity and stability (noise reducton) of the measurements by functionalization of the electrodes and differential conductance measurement technique
    • graphene electrodes for achieving truly single-base resolution

band gap manipulation in polymers

  • Polymer chains are natural wires that can be made semiconducting or even metallic by manipulating their band gap. In the case of a molecule band gap roughly corresponds to the energy difference between highest occupied and lowest unoccupied molecular orbitals (HOMO-LUMO gap).
  • Combining pieces of wires with different properties creates asymmetry needed for making electrical rectifiers and non-linear devices.
  • we study:
    • dependance of the gap on the structure and environment of the wire
  • we do:
    • chemical polymer synthesis and characterization
    • electrical contacting of molecular wires and assessment of their transport properties