Vincent Martinez1, Hana Han1, János Vörös1, Tomaso Zambelli2. 1. Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich. 2. Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich;, Email: ztomaso@ethz.ch.