1. Polymer Chemistry and Bioengineering Group, Zernike Institute for Advanced Materials; University of Groningen; Nijenborgh 4 9747 AG Groningen The Netherlands
2. The Bio and Molecular Electronics Group; Department of Materials Science and Engineering; Faculty of Engineering and University Center for Nano Science and Nanotechnology, Tel. Aviv University; Tel-Aviv 69978 Israel
3. Molecular Electronics Group; Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany