1. Nanobioengineering group Institute for Bioengineering of Catalonia (IBEC) Barcelona Science Park c/ Baldiri Reixac 10‐12, 08028 Barcelona (Spain)
2. Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER‐BBN) Barcelona (Spain)
3. Department of Electronics, University of Barcelona c/ Baldiri Reixac 10‐12, 08028 Barcelona (Spain)
4. Centre Nacional de Microelectrònica (IMB‐CSIC) Campus UAB, 08193, Bellaterra, Barcelona (Spain)
5. Present address: Université Claude Bernard – Lyon 1 LSA – UMR 5180, 43 Bd du 11 novembre 1918 69622 Villeurbanne Cedex (France)