Regensburg 2010 – scientific programme
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BP: Fachverband Biologische Physik
BP 34: Posters: New Technologies
BP 34.16: Poster
Thursday, March 25, 2010, 17:15–20:00, Poster B2
Towards solid state nanopores with single walled carbon nanotube contacts — Camille Raillon1, Sudhir Husale1, •Matthias Heise2, Juri Allerdings2, Christoph Strunk2, and Aleksandra Radenovic1 — 1LBEN, IBI EPFL Lausanne 1015 Switzerland — 2Institut für experimentelle und angewandte Physik, 93040 Regensburg
We integrate nanoelectrodes with solid state nanopores for detection of passing molecules, e.g., DNA. To control the translocation speed we use optical tweezers [1], to increase spatial resolution of the sensor electrodes made from single walled carbon nanotubes (SWNT) comparable in thickness and distance to a single nucleotide are desirable. We used dielectrophoresis (DEP) method to attach nanotubes in the lithographically defined nanogaps. DEP is well known method and can potentially be used as an efficient trapping tool in the fabrication of such molecular devices. When an electric field is applied, we have observed that density of SWNTs in the nanogap can be tuned with the applied voltage (~ 0.1 V to 0.5 V). Nanogaps < 10nm have been achieved in this way. In a complementary way we grow SWNT from e-beam predefined catalyst particles deposited on our Si3N4 membranes. We then drill a hole through the membrane using the focused beam of a transmission electron microscop (TEM) at a position where a nanotube was grown. By this we cut the tube in half, resulting in a nanopore with a pair of SWNT nanoelectrodes. [1] E. H. Trepagnier et al., Nano Letters 7, 2824 (2007).