Regensburg 2010 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 21: Organic Electronics and Photovoltaics III

CPP 21.11: Talk

Wednesday, March 24, 2010, 12:15–12:30, H37

Self organized molecular electronic junctions using two phase liquid structures in microfluidic channels — •Shashi Thutupalli¹, Mark Elbing², Matthias Fischer², David Muñoz³, Ralf Seemann^1,4, Marcel Mayor^2,3, and Stephan Herminghaus¹ — ¹MPI for Dynamics and Self Organization, Göttingen, Germany — ²Forschungszentrum Karlsruhe GmbH, Institute for Nanotechnology, Karlsruhe, Germany — ³University of Basel, Department of Chemistry, Basel, Switzerland — ⁴Experimental Physics, Saarland University, Saarbrücken, Germany

Using a combination of microfluidics and molecular design, we demonstrate self assembled, reconfigurable molecular electronic junctions. To construct metal-molecule-metal junctions, we employ liquid mercury as the electrode contact in crossed microfluidic channels. Self assembled monolayers (SAM's) of conducting molecular rods are created on the surface of the mercury, which are then bridged to the other mercury electrode via microfluidic control. By precise flow control, we create rectifying molecular junctions using asymmetric molecules. We report on the electrical properties of these microfluidic metal-molecule-metal junctions. Also, we use surfactant stabilized foam-like water-in-oil emulsions to form variable molecular junctions. Here, molecules synthesized with hydrophobic conducting cores and hydrophilic ends self-insert into the lamellae between aqueous droplets. Using the aqueous droplets then as the molecular contacts, we report on the conducting properties of the inserted molecules and demonstrate the possibility of reconfigurable circuits using topological droplet rearrangements.